Frequencies and population densities of plant-parasitic nematodes on banana (Musa AAA) plantations in Ecuador from 2008 to 2014
Frecuencias y densidades poblacionales de los nematodos parásitos en banano (Musa AAA) en plantaciones de Ecuador desde 2008 hasta 2014
DOI:
https://doi.org/10.15446/agron.colomb.v34n1.53915Palabras clave:
Helicotylenchus spp., Meloidogyne spp., Pratylenchus spp., Radopholus similis, population distribution, pests of plants. (en)Helicotylenchus spp, Meloidogyne spp, Pratylenchus spp, Radopholus similis, distribución de la población, plagas de plantas (es)
Se realizó un análisis de los nematodos parásitos encontrados en las plantaciones de banano (Musa AAA) en las provincias de Cañar, El Oro, Guayas, Los Ríos y Santo Domingo de Ecuador desde 2008 hasta 2014. La extracción de nematodos se hizo de 25 g de raíces frescas que fueron maceradas en una licuadora y los nematodos recuperados en la criba No 500 mesh (0,025 mm). Los datos se sometieron a un análisis de frecuencias en PC-SAS y se calculó la frecuencia absoluta para cada género. Cuatro géneros de nematodos parásitos de plantas fueron detectados, y basado en sus frecuencias y densidades poblacionales, los géneros de nematodos en orden decreciente sería: Radopholus similis > Helicotylenchus spp. > Meloidogyne spp. > Pratylenchus spp. Radopholus similis fue el nematodo más abundante contabilizando de 49 a 66% de la población total de las raíces, seguido por Helicotylenchus spp. con 29 a 45% de la población a través de los diferentes años analizados. De un total de 13,773 muestras de raíces, 96% tenían R. similis, 91% Helicotylenchus spp., 35% Meloidogyne spp., 25% Pratylenchus spp., y cuando se agrupó todos los nematodos presentes (nematodos totales) 99,9% de las muestras tenían nematodos. Un gran número de muestras con poblaciones de nematodos superior al umbral económico sugerido por Agrocalidad-INIAP y Anemagro (2,500-3,000 nematodos/100 g de raíces) fueron observadas en todos los años, meses y en las cinco provincias muestreadas. La diferencia estadística (P<0.0001) detectada en la frecuencia entre años, meses y provincias muy probablemente esté asociada con el alto nsmero de muestras incluidas en cada año, mes y provincia, ya que las variaciones en las frecuencias en cada género fueron pequeñas.
Doi: 10.15446/agron.colomb.v34n1.53915
Frequencies and population densities of plant-parasitic nematodes on banana (Musa AAA) plantations in Ecuador from 2008 to 2014
Orlando Aguirre1, César Chávez1, Alejandro Giraud2, and Mario Araya2
1 Laboratorio de Analisis Agricola (Nemalab). Machala (Ecuador)
2 AMVAC Chemical Corporation. Grecia (Costa Rica). marioa@amvac-chemicalcr.com
Received for publication: 1 November, 2015. Accepted for publication: 28 March, 2016.
ABSTRACT
An analysis of the plant-parasitic nematodes found on the banana (Musa AAA) plantations in the provinces of Cañar, El Oro, Guayas, Los Rios and Santo Domingo of Ecuador from 2008 to 2014 was carried out. The nematode extraction was done from 25 g of fresh roots that were macerated in a blender and from which nematodes were recovered in a 0.025 mm (No 500) mesh sieve. The data were subjected to frequency analysis in PC-SAS and the absolute frequency was calculated for each individual genus. Four plant parasitic nematodes were detected and, based on their frequencies and population densities, the nematode genera in decreasing order was: Radopholus similis > Helicotylenchus spp. > Meloidogyne spp. > Pratylenchus spp. Radopholus similis was the most abundant nematode, accounting for 49 to 66% of the overall root population, followed by Helicotylenchus spp. with 29 to 45% of the population through- out the different analyzed years. From a total of 13,773 root samples, 96% contained R. similis, 91% Helicotylenchus spp., 35% Meloidogyne spp., and 25% Pratylenchus spp. and, when all of the nematodes that were present were pooled (total nematodes), 99.9% of the samples had nematodes. A large number of samples with a nematode population above the economic threshold suggested by Agrocalidad, INIAP and Anemagro (2,500-3,000 nematodes/100 g of roots) was observed in all of the years, the months and the five sampled provinces. The statistical differences (P<0.0001) detected for the nematode frequencies among the years, months and provinces, more than likely, were associated with the high number of samples included in each year, month and province because the variations in the frequencies for each nematode genus were small.
Key words: Helicotylenchus spp., Meloidogyne spp., Pratylenchus spp., Radopholus similis, population distribution, pests of plants.
RESUMEN
Se realizó un análisis de los nematodos parásitos encontrados en las plantaciones de banano (Musa AAA) en las provincias de Cañar, El Oro, Guayas, Los Ríos y Santo Domingo de Ecuador desde 2008 hasta 2014. La extracción de nematodos se hizo de 25 g de raíces frescas que fueron maceradas en una licuadora y los nematodos recuperados en la criba No 500 mesh (0,025 mm). Los datos se sometieron a un análisis de frecuencias en PC-SAS y se calculó la frecuencia absoluta para cada género. Cuatro géneros de nematodos parásitos de plantas fueron detectados, y basado en sus frecuencias y densidades poblacionales, los géneros de nematodos en orden decreciente sería: Radopholus similis > Helicotylenchus spp. > Meloidogyne spp. > Pratylenchus spp. Radopholus similis fue el nematodo más abundante contabilizando de 49 a 66% de la población total de las raíces, seguido por Helicotylenchus spp. con 29 a 45% de la población a través de los diferentes años analizados. De un total de 13,773 muestras de raíces, 96% tenían R. similis, 91% Helicotylenchus spp., 35% Meloidogyne spp., 25% Pratylenchus spp., y cuando se agrupó todos los nematodos presentes (nematodos totales) 99,9% de las muestras tenían nematodos. Un gran número de muestras con poblaciones de nematodos superior al umbral económico sugerido por Agrocalidad-INIAP y Anemagro (2,500-3,000 nematodos/100 g de raíces) fueron observadas en todos los años, meses y en las cinco provincias muestreadas. La diferencia estadística (P<0.0001) detectada en la frecuencia entre años, meses y provincias muy probablemente esté asociada con el alto nsmero de muestras incluidas en cada año, mes y provincia, ya que las variaciones en las frecuencias en cada género fueron pequeñas.
Palabras clave: Helicotylenchus spp., Meloidogyne spp., Pratylenchus spp., Radopholus similis, distribución de la población, plagas de plantas.
Introduction
Bananas (Musa AAA cv. Grande Naine, Valery, and Williams) are cultivated in Ecuador for export markets. It is the most important crop, accounting for almost 25% of the agricultural gross national product. In 2014, 286 million boxes of 43 pound were exported (AEBE, 2015), produced on 266,124 ha, which gave a total income of US $2.300 million FOB.
Besides the constraints of the banana market requirements and demands, there are other factors that limit production. Among the important abiotic factors constraining banana yield are reduced radiation, low temperatures for part of the year, a shallow soil water table level and edaphic conditions, mainly due to clay texture, poor structure and high sodium (Na) content. These constraints differ between the farms and provinces and not all happen on a specific farm. Plantations are found in flat areas with no more than 4% slope, with the cultivated area close to sea level, no more than 100 m a.s.l.
Within the biotic factors, phytonematodes are second, after black Sigatoka, caused by Mycosphaerella fijiensis. On local plantations, usually only polyspecific communities occur, consisting mainly of a mixture of R. similis, and Helicoty- lenchus spp., with very low populations of Meloidogyne spp., and Pratylenchus spp. Nematodes increase the time for leaf emission, reduce the bunch weight and plant longevity, and increase the crop cycle duration (Quénéhervéet al., 1991a; Araya, 2004).
To avoid or reduce nematode damage, the only management strategy currently available is the regular application of non-fumigant nematicides, which growers know is economically feasible. However, a nematicide application is done only on farms with high yields, in an intensive manner. Then, there are many large, medium and small farms that have low yields due in part to severe nematode root damage because nematode control measurements are not used.
Economic and environmental constrains dictate the rational use of non-fumigant nematicides at the recommended dosages. To achieve this, more research is needed for the evaluation of biocontrol agents, cultural practices, nematicide rotations, number of cycles per year, and application systems to prevent nematode population build up and root damage.
The objective of this study was to provide quantitative in- formation on population densities and frequencies of the major nematode pests on Ecuadorian banana plantations from 2008 to 2014. This information will be useful for identifying more appropriate research areas for nematode management and as a basis to justify more investment.
Materials and methods
The nematode data included in the analysis were from root samples of long-term commercial banana plantations of the provinces of Cañar, El Oro, Guayas, Los Ríos and Santo Domingo, where the crop is cultivated in the country. The farms vary in soil type, texture, structure, content of macro and micro nutrients and climatic conditions. The age of the plantations ranged from 5 to 40 years with a plant density of 1,300 to 1,700 plants/ha and the sown cultivars were mainly of the Cavendish subgroup: Grande Naine, Valery, and Williams. The bunching plants were supported by tying them to adjacent plants with double polypropylene twine, propping them with wood poles or by aerial gugying.
Various banana cultural practices (fertilization, control of weed and nematodes and aerial spraying of fungicides to control black Sigatoka) were carried out during the years, which may have influenced the nematode population behavior reported in this paper. Desuckering was carried out every six to eight weeks throughout the years, leaving the production unit with a bearing mother plant, a large daughter sucker, and a small grand-daughter.
Usually, the water requirement was supplied by rainfall during the rainy season, from January to April, while, from May to December, sprinkle irrigation was necessary each year. The average rainfall (2008-2014) varied from 672 to 4,024 mm. A complex system of primary, secondary and tertiary drains was installed to carry off excess water, lower the water table and prevent waterlogging.
The data of the samples recorded by Nemalab S.A. from 2008 to 2014 were used for this study. A total of 13,773 root samples were processed from January 2008 to December 2014 and entered into a computer database along with the farm identity, province, month and year of sampling. Each root sample consisted of the roots of ten randomly selected stools, which consisted of a mother plant and follower sucker. The samples were taken either from the follower sucker, 1.25 to 1.75 m height, or from the area between the recently flowered plant (within 8 d of flower emergence) and its follower sucker, 1.25 to 1.75 m of height. A hole about 30 cm long, 30 cm wide and 30 cm deep (soil volume of 27 L) was dug with a shovel at the plant base. Roots from each hole were collected, placed in labeled plastic bags, and delivered to the laboratory in coolers.
In the lab, the root samples were registered and processed as soon as possible, and when it was necessary, stored in a refrigerator (General Electric) adjusted to 6-8oC until being processed. The roots were rinsed free of soil, separated in functional (living roots, either healthy or with symptoms of nematode damage, but without necrosis or root decay) and non-functional roots (dead, snapping or very extensively necrotic root tissue), left to dry off the surface moisture and weighed. During the root separation process, in some roots, it was necessary to cut some damaged parts, which were classified as non-functional roots. The remaining part was the functional root. The nematode extraction was made from 25 g of fresh functional root subsamples by the Taylor and Loegering (1953) method, as modified by Araya (2002). The nematodes were identified at the genus and species level when possible, based on the morphological characteristics under a light microscope, following the key of Siddiqi (2000). The population densities of all of the present plant-parasitic root nematodes were determined and the values were converted to numbers per 100 g of fresh roots.
The data were subjected to a frequency distribution analysis for each particular nematode by year, month, and province in PC-SAS (SAS Institute, Cary, NC). The absolute frequency was calculated as No. samples containing a species / No. samples collected * 100 (Barker, 1985). Additionally, in each nematode genus, the samples were distributed according to specific ranges of population densities as follows: free of nematodes, from 1 to 2,500, from 2,501 to 5,000, from 5,001 to 10,000, from 10,001 to 20,000, from 20,001 to 30,000, and samples over 30,000 individuals per 100 g of fresh root. The percentage of samples containing a nematode genus was compared between the years, months and provinces by Proc Gmod of SAS using the log trans- formation as the link function and the negative binomial probability distribution to model the errors.
Results
Irrespective of the year, the major plant-parasitic nematodes present in the sampling areas were R. similis, which varied from 49 to 66%, and Helicotylenchus spp., varying from 29 to 45% (Fig. 1). Meloidogyne spp. and Pratylenchus spp. contributed with 3 to 8% and 2 to 3% to the total nematode population, respectively (Fig. 1). Even though a difference (P<0.0001) was detected between the years for the frequency of the different nematode genera, the values for each genus were very similar in the different studied years (Tab. 1). The highest frequency was always found in R. similis, above 92%, followed by Helicotylenchus spp. which ranged from 74 to 94%, then Meloidogyne spp. which varied from 28 to 44% and Pratylenchus spp. from 11 to 34%. Considering all of the nematodes, all of the samples in every year had at least one nematode genus reaching a frequency of 100%.
By month, again R. similis (> 86%) and Helicotylenchus spp. (>84%) were the main nematodes in the samples, followed by Meloidogyne spp. (28-48%) and Pratylenchus spp. (13-31%) at smaller proportions and, in practically all of the samples (> 99%), at least one of those nematodes was present (Tab. 2). Although statistical differences (P<0.0001) were reported for those frequencies between the months, their variations were small.
A similar trend was observed for the frequencies (P<0.0041) among the provinces, where the variation within each genus was small (Tab. 3). In descending order, the highest frequency was detected for total nematodes with 100% followed by R. similis above 90%. For Helicotylenchus spp., it varied from 64% in Cañar to 95% in Los Ríos, for Meloidogyne spp. it varied from 29 to 44%, while for Pratylenchus spp. with the exception of Santo Domingo that reached 8% in the other provinces was very similar varying from 25 to 28%.
The distribution of the root samples for each nematode population density clearly indicated that R. similis showed the highest population (Fig. 2). From the 13,773 recorded root samples, only 4.2% were free of nematodes and 45.3% were above 5,000 per 100 g of roots (Fig. 2). For Helicotylenchus spp., only 9.3% of the samples were found to be negative and 31.1% had levels above 5,000 nematodes. More than 64.7% of the samples were free of Meloidogyne spp. and 1% showed densities higher than 5,000 nematodes. Prat- ylenchus spp. was present in 25.4% of the samples, with only 0.2% above 5,000 nematodes. When all of the nematodes were pooled (total nematodes), it was observed that only nine samples (0.07%) were free of nematodes and 79.3% contained more than 5,000 nematodes per 100 g of roots.
Because R. similis comprised more than 49% of the overall nematode population and all four cause damage to the banana root system, it was decided to show the total nematode density ratios distribution by year, month and province. A stable trend in the number of samples (67-87.3%), with levels higher than 5,000 nematodes was observed among the different analyzed years (Fig. 3). In every month of the year, between 70 and 87.7% of the samples had a high nematode content and less than 0.14% of the samples were nematode free (Fig. 4). A similar pattern was detected in the provinces, where 64.8 to 91.9% of the samples showed populations over 5,000 individuals per 100 g of roots (Fig. 5).
Discussion
The four detected nematode genera are well known pathogens in banana roots (Sarah, 1989; Gowen and Quénéhervé, 1990; Fogain, 1994; Gowen, 1995; Davide, 1996; Sarah et al., 1996; Bridge et al., 1997; Marin et al., 1998; De Waele and Davide, 1998; Gowen, 2000a, 2000b; De Waele, 2000; Gowen et al., 2005; Dubois and Coyne, 2011; Volcy, 2011). These nematodes continue to be a serious threat to banana production in Latin America and the Caribbean (Dita et al., 2013).
The nematode genera encountered in this study are consistent with those found earlier in Ecuador by Quimí (1981), Asanza et al. (1994), Gómez (1997), Jiménez et al. (1998), and Chávez and Araya (2001, 2010) and also with those reported in Colombia (Volcy 2011), Venezuela (Haddad et al., 1975), Bolivia (Quispe, 2004), Brasil (Lima et al. 2013), México (Guzmánet al., 1995), Costa Rica (Araya et al., 2002), Belize (Ramclam and Araya, 2006), Martinique (Chabrier et al., 2002), Australia (Jackson et al., 2003), Phil- lipines (Davide, 1994), India (Gantait et al., 2011), Ivory Coast (Quénéhervéet al., 1991a, 1991b), South Africa (Daneel et al., 2015), Democratic Republic of Congo (Kamira et al., 2013), and other African countries (Dubois and Coyne, 2011; Blomme et al., 2013).
Nematodes were present in all of the years, provinces and months because of the continual monoculture of bananas and favorable edaphic and climatic conditions. The statistical significance that was detected in all frequencies by year, month and province more likely came from the high number of observations in each case. The low variation in the nematode frequencies may have been due in part to the stable soil moisture since, in the dry season, water was supplied by sprinkle irrigation, which also reduces the soil temperature variation.
The high population densities and frequencies found for R. similis are encouraged by the long time banana mono- culture and coincided with other local studies (Asanza et al., 1994; Gómez, 1997; Jiménez et al., 1998; Chávez and Araya, 2001, 2010) and with studies from Colombia (Jaramillo and Quirós, 1984), Costa Rica (Araya et al., 2002), Belize (Ramclam and Araya, 2006) and with studies from Philippines (Davide, 1994). The lack of nematode control measures, superficial water table level, and inadequate knowledge of the farmers could also have contributed to the heavy infestations. High nematode population densities were found in all of the provinces, which calls for research on how to control them. However, it is advisable first to run experiments on the largest banana producing province.
Based on the observed nematode frequency and population densities, the relative importance of the nematode genera in the commercial banana clones appeared to decrease in the following order: R. similis > Helicotylenchus spp. > Meloido- gyne spp. > Pratylenchus spp., in agreement with that found earlier by Chávez and Araya (2001, 2010). Individual and in concomitancy pathogenicity studies are necessary to verify if this relative importance corresponds with the damage caused by each pest and with the established economic threshold. The behavior of R. similis as the principal ba- nana root nematode was confirmed by the observations of Blomme et al. (2013) in African countries, Stanton (1994) in Australia, Davide (1994) in Philippines, Pone (1994) in the Pacific Islands, Jiménez et al. (1998) in Ecuador, Gómez (1980) in Colombia, and Araya et al. (2002) in Costa Rica.
The high frequency and population density of R. similis could be a consequence of the affinity between this nematode and the commercial banana (Musa AAA), its type host (Baker et al., 2014). The high levels of R. similis agree with the high reproductive fitness of R. similis on banana plants cultivates under controlled conditions (Stoffelen et al., 1999a) and in vitro on carrot disc cultures (Stoffelen et al., 1999b).
The different parasitic habits of the present nematode genera, migratory endoparasites: Radopholus and Prat- ylenchus, sedentary endoparasite: Meloidogyne and ecto- endoparasite, feeding on subsurface tissue Helicotylenchus are likely to exacerbate root damage, because lesions can develop at feeding sites in the root cortex and through the root tissue. The Helicotylenchus spp. levels were lower than the R. similis populations, in agreement with other results (Araya et al., 2002). More likely, this is because banana roots are not as good of a host for this nematode as they are for R. similis. Also, there is a difference in the life cycles. For example, in H. multicinctus, the life cycle has taken 42 days at 28 oC on Arabidopsis thaliana, the adult females laid eggs at the rate of 4 per day for a period of 10-12 days (Orion and Bar-Eyal, 1995), while in R. similis, the life cycle has been completed in 20-25 days at 24-32oC on banana roots, and the adult females laid 4-5 eggs per day during 15 days (Loos, 1962). This means that more generations and more individuals per generation could be expected in the same period of time in the case of R. similis.
The low frequency and population density of Meloidogyne spp. could be related to the feeding behavior of R. similis. Santor and Davide (1992) found that the presence of R. similis on the galls caused deterioration and desintegration of the giant cells, which affected the development and reproduction of M. incognita. Pratylenchus spp. were rarely present and in low densities, which is reasonable because it has the same habitat as R. similis and a longer life cycle (Siddiqi, 1972).
For the local conditions, the Instituto Nacional Autónomo de Investigaciones Agropecuarias-INIAP (2015) has recommended the application of non-fumigant nematicides when R. similis is over 10,000 individuals per 100 g of total roots in samples taken between the mother plant and its follower sucker, or over 2500 per 100 g of total roots in samples taken from follower suckers. The local laboratory, Anemagro (2014) suggested that the use of non-fumigant nematicides when R. similis is over 10,000 individuals per 100 g of total roots, or over 2,000 per 100 g of functional roots in samples taken from recently flowered plants and, when samples are taken from follower suckers, over 3,000 per 100 g of total roots or over 1,000 per 100 g of functional roots. The Agencia Ecuatoriana de Aseguramiento de la Calidad del Agro (Agrocalidad, 2014) promotes nematicide applications when R. similis is over 10,000 per 100 g of total roots, obtained from samples taken in the interspace between the mother plant and its follower, or over 2,500 per 100 g of roots if samples are taken from the follower sucker.
These economic thresholds consider only R. similis; how- ever, there is scientific knowledge that H. multicinctus and H. dihystera (McSorley and Parrado, 1986; Davide, 1996; Mani and Al Hinai, 1996; Chau et al., 1997; Hartman et al., 2010; Das et al. 2014) damage the banana root system and reduce yield by between 19% (Speijer and Fogain, 1999) and 34% (Reddy, 1994). Also, it is well known that Meloidogyne spp. (Santor and Davide, 1992; Davide and Marasigan, 1992; Fogain, 1994; Patel et al., 1996; Moens and Araya-Vargas, 2002) and Pratylenchus spp. (Pinochet, 1978; Tarté, 1980; Rodríguez, 1990; Bridge et al., 1997; Moens and Araya-Vargas, 2002) damage banana roots and reduce yield. Therefore, deciding on the nematode management depends on the total phytonematode population because all four genera damage the banana root system.
Conclusion
The main nematodes that parasitize banana roots around the world are found in the banana production provinces of Ecuador and, in many cases, reach population densities above the economic threshold at any month of the year, which cause damage to the banana root system, restricting water and nutrient up take, increasing time for leaf emission, reducing bunch weight and plant longevity and increasing the crop cycle duration.
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De Waele, D. and R.G. Davide. 1998. The root-knot nematodes of banana. Meloidogyne incognita (Kofoid & White, 1919) Chitwood, 1949. Meloidogyne javanica (Treub, 1885) Chitwood, 1949. Musa Pest Factsheet No. 3. INIBAP, Montpellier, France.
Dita, M.A., H. Garming, I. Van den Vergh, C. Staver, T. Lescot. 2013. Banana in Latin America and the Caribbean: current state, challenges and perspectives. Acta Hortic. 986, 79-86. Doi. 10.17660/actahortic.2013.986.39
Dubois, T. and D.L. Coyne. 2011. Integrated pest management of banana. pp. 121-144. In: Pillay, M., and A. Tenkouano (eds.). Banana breeding: progress and challenges. CRC Press, Washington DC. Doi: 10.1201/b10514-8
Fogain, R. 1994. Root knot nematodes: a serious threat to banana productions in Cameroon? MusAfrica 4, 3.
Gantait, V.V., T. Bhattacharya, and A. Chatterjee. 2011. Temporal variation in abundance of nematodes in a banana plantation of West Bengal, India. Nematol. Medit. 39, 9-15.
Gómez, J.T. 1980. Determinación de la infestación de fitonematodos en plantaciones bananeras de Urabá, Colombia. Fitopatol. Colomb. 9, 19-32.
Gómez, J.T. 1997. Dispersión y niveles de infestación de Radopholus similis Cobb en algunas plantaciones bananeras del Ecuador. Nematrópica 27, 111.
Gowen, S.R. 1995. Pests. pp. 382-402. In: Gowen, S. (eds.). Bananas and plantains. Springer Netherlands, Dordrecht, The Netherlands. Doi: 10.1007/978-94-011-0737-2_13
Gowen, S.R. 2000a. Nematode pathogens: root-lesion nematodes. pp. 303-306. In: Jones, D.R. (ed.). Diseases of banana, abacá and enset. CABI International, Wallingford, UK.
Gowen, S.R. 2000b. Nematode pathogens: spiral nematode. pp. 306-307. In: Jones, D.R. (ed.). Diseases of banana, abacá and enset. CABI International, Wallingford, UK.
Gowen, S. and P. Quénéhervé, 1990. Nematodes parasites of bananas, plantains and abacá. pp. 431-460. In: Luc, M., R.A. Sikora, and J. Bridge (eds.). Plant parasitic nematodes in subtropical and tropical agriculture. CABI International, Wallingford, UK.
Gowen, S.R., P. Quénéhervé, and R. Fogain. 2005. Nematode parasites of bananas and plantains. pp. 611-643. In: Luc, M., R.A. Sikora, and J. Bridge (eds). Plant parasitic nematodes in subtropical and tropical agriculture. 2nd ed. CABI International, Wallingford, UK. Doi: 10.1079/9780851997278.0611
Guzmán, G.S., S.M. Orozco, L.J. Farias, R.M. Bibián. 1995. Efecto del fosthiazate sobre la población del nematodo Radopholus similis en banano Gran Enano. pp. 495-502. In: XI Reunión ACORBAT, San José, Costa Rica.
Haddad G., O., J.A. Meredith, G.J. Martínez. 1975. Nematodos parasíticos asociados a cultivares y clones de bananos en Venezuela. Nematrópica 5, 33-39.
Hartman, J.B., D. Vuylsteke, P.R. Speije, F. Ssango, D.L. Coyne, D. De Waele. 2010. Measurement of the field response of Musa genotypes to Radopholus similis and Helicotylenchus multicinctus and the implications for nematode resistance breeding. Euphytica 172, 139-148. Doi: 10.1007/s10681-009-0104-4
INIAP, Instituto Nacional Autónomo de Investigaciones Agropecuarias. 2015. Diagnóstico nematológico. Estación Experimental del Litoral Sur, Cantón Yaguachi, Ecuador.
Jackson, G.V.H., T.K. Ruabete, and J.G. Wright. 2003. Burrowing and lesion nematodes of banana. 2nd ed. Pest Advisory leaflet No 5. Secretariat of Pacific Community, Nouméa, New Caledonia.
Jaramillo, R., and J. Quirós. 1984. Evaluación de cinco nematicidas en el control de Radopholus similis (Cobb) Thorne en la zona bananera de Urabá, Colombia. Augura 10, 73-88.
Jiménez, F., I. Ma, C. Triviño, and L. Velasco. 1998. Influencia de la temperatura y la precipitación en la fluctuación poblacional de Radopholus similis en las zonas Oriental y Central del Ecuador. pp. 547-555. In: Hidalgo A., L. (ed.). Memorias XIII reunión Acorbat. Conaban, Guayaquil, Ecuador.
Kamira, M., S. Hauser, P. Van Asten, D. Coyne, and H.L. Talwana. 2013. Plant parasitic nematodes associated with banana and plantain in Eastern and Western Democratic Republic of Congo. Nematrópica 43, 216-225.
Lima, R.S., M.F.S. Muniz, J.M.C. Castro, E.R.L. Oliveira, P.G. Oliveira, K.M.S. Siqueira, A.C.Z. Machado, and J.G. Costa. 2013. Frequencies and population densities of the major phytonematodes associated with banana in the state of Alagoas, Brazil. Nematrópica 43, 186-193.
Loos, C.A. 1962. Studies on the life-history and habits of the burrowing nematode, Radopholus similis, the cause of black-head disease of banana. Proc. Helminthol. Soc. Wash. 29, 43-52.
Mani, A. and M.S. Al Hinai. 1996. Population dynamics and control of plant parasitic nematodes on banana in the Sultanate of Oman. Nematol. Medit. 24, 295-299.
Marin, D.H., T.B. Sutton, and K.R. Barker. 1998. Dissemination of bananas in Latin America and the Caribbean and its relationship to the ocurrence of Radopholus similis. Plant Dis. 82, 964-974. Doi: 10.1094/PDIS.1998.82.9.964
McSorley, R. and J.L. Parrado. 1986. Nematological reviews. Helicotylenchus multicinctus on bananas: an international problem. Nematrópica 16, 73-91.
Moens, T. and M. Araya-Vargas. 2002. Efecto de Radopholus similis, Meloidogyne incognita, Pratylenchus coffeae y Helicotylenchus multicinctus en la producción de Musa AAA cv. Grande Naine. Corbana 55, 43-56.
Orion, D., and M. Bar-Eyal. 1995. Observations on the life cycle and behavior of Helicotylenchus multicinctus in monoxenic culture on Arabidopsis thaliana. Nematrópica 25, 67-70.
Patel, B.A., R.V. Byas, D.J. Patel, and R.S. Patel. 1996. Susceptibility of banana cultivars to root-knot nematodes (Meloidogyne sp.). InfoMusa 5, 26-27.
Pinochet, J. 1978. Histopathology of the root lesion nematode, Pratylenchus coffeae, on plantains, Musa AAB. Nematologica 24, 337-340. Doi: 10.1163/187529278X00344
Pone, S. 1994. Status of nematode and weevil borer problems affecting banana in some of the Pacific Islands. pp. 90-105. In: Valmayor, R.V., R.G. Davide, J.M. Stanton, N.L. Treverrow, and V.N. Roa (eds.). Banana nematodes and weevil borers in Asia and the Pacific. INIBAP; ASPNET, Los Baños, Philippines.
Quénéhervé, P., P. Cadet, T. Mateille, and P. Toport. 1991a. Population of nematodes in soils under bananas, cv. Poyo, in the Ivory Coast. 5. Screening of nematicides and horticultural results. Revue of Nématol. 14, 231-249.
Quénéhervé, P., T. Mateille, and P. Topart. 1991b. Effect of cadusafos compared with three other non-fumigant nematicides on the control of nematodes and on the yield of banana cv. Poyo in the Ivory Coast. Revue Nématol. 14, 207-211.
Quimí, V.H. 1981. Empleo de tres dosis de ethoprop, phenamiphos y carbofuran en el control de Radopholus similis en bananeras establecidas. Boletín Técnico No. 41. Instituto Nacional de Investigaciones Agropecuarias (INIAP), Guayaquil, Ecuador.
Quispe, G.J.L. 2004. Densidad poblacional de nematodos fitoparásitos en plantaciones de banano (Musa AAA) en alto Beni, La Paz. Undergraduate thesis. Faculty of Agronomy, Universidad Mayor de San Andrés, La Paz, Bolivia.
Ramclam, W. and M. Araya. 2006. Frequency of occurrence and abundance of root nematodes on banana (Musa AAA) in Belize. Int. J. Pest Manage. 52, 71-77. Doi: 10.1080/09670870600581009
Reddy, P.P. 1994. Status of banana nematodes in India. pp. 247-254. In: Valmayor, R.V., R.G. Davide, J.M. Stanton, N.L. Treverrow, and V.N. Roa (eds.). Banana nematodes and weevil borers in Asia and the Pacific. INIBAP; ASPNET, Los Baños, Philippines.
Rodríguez R., R. 1990. Los nematodos de la platanera (Musa acuminata AAA, subgrupo Cavendish Enana) en Canarias (1963-1984). Xoba: Rev. Agric. Monografía No. 4. Universidad de Las Palmas de Gran Canaria, Las Palmas de Gran Canaria, Spain.
Santor, R.W. and R.G. Davide. 1992. Interrelaionship of Radopholus similis and Meloidogyne incognita in banana. pp. 71-77. In: Davide, R.G. (ed.). Studies on nematodes affecting bananas in the Philippines. Philippine Agriculture and Resources Research Foundation, Los Baños, Philippines.
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De Waele, D. 2000. Root knot nematodes. pp. 307-314. In: Jones, D.R. (ed.). Diseases of Banana, Abacá and Enset. CABI CAB International, Wallingford, UK.
De Waele, D. and R.G. Davide. 1998. The root-knot nematodes of banana. Meloidogyne incognita (Kofoid & White, 1919) Chitwood, 1949. Meloidogyne javanica (Treub, 1885) Chitwood, 1949. Musa Pest Factsheet No. 3. INIBAP, Montpellier, France.
Dita, M.A., H. Garming, I. Van den Vergh, C. Staver, T. Lescot. 2013. Banana in Latin America and the Caribbean: current state, challenges and perspectives. Acta Hortic. 986, 79-86. Doi. 10.17660/actahortic.2013.986.39
Dubois, T. and D.L. Coyne. 2011. Integrated pest management of banana. pp. 121-144. In: Pillay, M., and A. Tenkouano (eds.). Banana breeding: progress and challenges. CRC Press, Washington DC. Doi: 10.1201/b10514-8
Fogain, R. 1994. Root knot nematodes: a serious threat to banana productions in Cameroon? MusAfrica 4, 3.
Gantait, V.V., T. Bhattacharya, and A. Chatterjee. 2011. Temporal variation in abundance of nematodes in a banana plantation of West Bengal, India. Nematol. Medit. 39, 9-15.
Gómez, J.T. 1980. Determinación de la infestación de fitonematodos en plantaciones bananeras de Urabá, Colombia. Fitopatol. Colomb. 9, 19-32.
Gómez, J.T. 1997. Dispersión y niveles de infestación de Radopholus similis Cobb en algunas plantaciones bananeras del Ecuador. Nematrópica 27, 111.
Gowen, S.R. 1995. Pests. pp. 382-402. In: Gowen, S. (eds.). Bananas and plantains. Springer Netherlands, Dordrecht, The Netherlands. Doi: 10.1007/978-94-011-0737-2_13
Gowen, S.R. 2000a. Nematode pathogens: root-lesion nematodes. pp. 303-306. In: Jones, D.R. (ed.). Diseases of banana, abacá and enset. CABI International, Wallingford, UK.
Gowen, S.R. 2000b. Nematode pathogens: spiral nematode. pp. 306-307. In: Jones, D.R. (ed.). Diseases of banana, abacá and enset. CABI International, Wallingford, UK.
Gowen, S. and P. Quénéhervé, 1990. Nematodes parasites of bananas, plantains and abacá. pp. 431-460. In: Luc, M., R.A. Sikora, and J. Bridge (eds.). Plant parasitic nematodes in subtropical and tropical agriculture. CABI International, Wallingford, UK.
Gowen, S.R., P. Quénéhervé, and R. Fogain. 2005. Nematode parasites of bananas and plantains. pp. 611-643. In: Luc, M., R.A. Sikora, and J. Bridge (eds). Plant parasitic nematodes in subtropical and tropical agriculture. 2nd ed. CABI International, Wallingford, UK. Doi: 10.1079/9780851997278.0611
Guzmán, G.S., S.M. Orozco, L.J. Farias, R.M. Bibián. 1995. Efecto del fosthiazate sobre la población del nematodo Radopholus similis en banano Gran Enano. pp. 495-502. In: XI Reunión ACORBAT, San José, Costa Rica.
Haddad G., O., J.A. Meredith, G.J. Martínez. 1975. Nematodos parasíticos asociados a cultivares y clones de bananos en Venezuela. Nematrópica 5, 33-39.
Hartman, J.B., D. Vuylsteke, P.R. Speije, F. Ssango, D.L. Coyne, D. De Waele. 2010. Measurement of the field response of Musa genotypes to Radopholus similis and Helicotylenchus multicinctus and the implications for nematode resistance breeding. Euphytica 172, 139-148. Doi: 10.1007/s10681-009-0104-4
INIAP, Instituto Nacional Autónomo de Investigaciones Agropecuarias. 2015. Diagnóstico nematológico. Estación Experimental del Litoral Sur, Cantón Yaguachi, Ecuador.
Jackson, G.V.H., T.K. Ruabete, and J.G. Wright. 2003. Burrowing and lesion nematodes of banana. 2nd ed. Pest Advisory leaflet No 5. Secretariat of Pacific Community, Nouméa, New Caledonia.
Jaramillo, R., and J. Quirós. 1984. Evaluación de cinco nematicidas en el control de Radopholus similis (Cobb) Thorne en la zona bananera de Urabá, Colombia. Augura 10, 73-88.
Jiménez, F., I. Ma, C. Triviño, and L. Velasco. 1998. Influencia de la temperatura y la precipitación en la fluctuación poblacional de Radopholus similis en las zonas Oriental y Central del Ecuador. pp. 547-555. In: Hidalgo A., L. (ed.). Memorias XIII reunión Acorbat. Conaban, Guayaquil, Ecuador.
Kamira, M., S. Hauser, P. Van Asten, D. Coyne, and H.L. Talwana. 2013. Plant parasitic nematodes associated with banana and plantain in Eastern and Western Democratic Republic of Congo. Nematrópica 43, 216-225.
Lima, R.S., M.F.S. Muniz, J.M.C. Castro, E.R.L. Oliveira, P.G. Oliveira, K.M.S. Siqueira, A.C.Z. Machado, and J.G. Costa. 2013. Frequencies and population densities of the major phytonematodes associated with banana in the state of Alagoas, Brazil. Nematrópica 43, 186-193.
Loos, C.A. 1962. Studies on the life-history and habits of the burrowing nematode, Radopholus similis, the cause of black-head disease of banana. Proc. Helminthol. Soc. Wash. 29, 43-52.
Mani, A. and M.S. Al Hinai. 1996. Population dynamics and control of plant parasitic nematodes on banana in the Sultanate of Oman. Nematol. Medit. 24, 295-299.
Marin, D.H., T.B. Sutton, and K.R. Barker. 1998. Dissemination of bananas in Latin America and the Caribbean and its relationship to the ocurrence of Radopholus similis. Plant Dis. 82, 964-974. Doi: 10.1094/PDIS.1998.82.9.964
McSorley, R. and J.L. Parrado. 1986. Nematological reviews. Helicotylenchus multicinctus on bananas: an international problem. Nematrópica 16, 73-91.
Moens, T. and M. Araya-Vargas. 2002. Efecto de Radopholus similis, Meloidogyne incognita, Pratylenchus coffeae y Helicotylenchus multicinctus en la producción de Musa AAA cv. Grande Naine. Corbana 55, 43-56.
Orion, D., and M. Bar-Eyal. 1995. Observations on the life cycle and behavior of Helicotylenchus multicinctus in monoxenic culture on Arabidopsis thaliana. Nematrópica 25, 67-70.
Patel, B.A., R.V. Byas, D.J. Patel, and R.S. Patel. 1996. Susceptibility of banana cultivars to root-knot nematodes (Meloidogyne sp.). InfoMusa 5, 26-27.
Pinochet, J. 1978. Histopathology of the root lesion nematode, Pratylenchus coffeae, on plantains, Musa AAB. Nematologica 24, 337-340. Doi: 10.1163/187529278X00344
Pone, S. 1994. Status of nematode and weevil borer problems affecting banana in some of the Pacific Islands. pp. 90-105. In: Valmayor, R.V., R.G. Davide, J.M. Stanton, N.L. Treverrow, and V.N. Roa (eds.). Banana nematodes and weevil borers in Asia and the Pacific. INIBAP; ASPNET, Los Baños, Philippines.
Quénéhervé, P., P. Cadet, T. Mateille, and P. Toport. 1991a. Population of nematodes in soils under bananas, cv. Poyo, in the Ivory Coast. 5. Screening of nematicides and horticultural results. Revue of Nématol. 14, 231-249.
Quénéhervé, P., T. Mateille, and P. Topart. 1991b. Effect of cadusafos compared with three other non-fumigant nematicides on the control of nematodes and on the yield of banana cv. Poyo in the Ivory Coast. Revue Nématol. 14, 207-211.
Quimí, V.H. 1981. Empleo de tres dosis de ethoprop, phenamiphos y carbofuran en el control de Radopholus similis en bananeras establecidas. Boletín Técnico No. 41. Instituto Nacional de Investigaciones Agropecuarias (INIAP), Guayaquil, Ecuador.
Quispe, G.J.L. 2004. Densidad poblacional de nematodos fitoparásitos en plantaciones de banano (Musa AAA) en alto Beni, La Paz. Undergraduate thesis. Faculty of Agronomy, Universidad Mayor de San Andrés, La Paz, Bolivia.
Ramclam, W. and M. Araya. 2006. Frequency of occurrence and abundance of root nematodes on banana (Musa AAA) in Belize. Int. J. Pest Manage. 52, 71-77. Doi: 10.1080/09670870600581009
Reddy, P.P. 1994. Status of banana nematodes in India. pp. 247-254. In: Valmayor, R.V., R.G. Davide, J.M. Stanton, N.L. Treverrow, and V.N. Roa (eds.). Banana nematodes and weevil borers in Asia and the Pacific. INIBAP; ASPNET, Los Baños, Philippines.
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