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Evaluating electrolysed oxidising water as a fungicide using two rose varieties (Rosa sp) in greenhouse conditions
Evaluación de la aplicación de agua electrolizada oxidante como fungicida en dos variedades de rosa (Rosa sp) en invernadero
Keywords:
Electrolysed oxidising water, application volume, hypochlorous acid concentration, powdery mildew, downy mildew, greymould, roses. (en)agua electrolizada oxidante, volumen de aplicación, concentración de ácido hipocloroso, Botrytis, mildeo polvoso, mildeo velloso, rosas. (es)
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The aim of evaluating electrolysed oxidising water (EOW) for controlling botrytis (Botrytis cinerea), powdery mildew (Sphaerotheca pannosa) and downy mildew (Peronospora sparsa) using two greenhouse rose varieties was to verify this new technology’s effectiveness by contrast with traditional chemical handling. Two concentrations of hypochlorous acid in EOW were produced during electrolysis in a P1200 cell and applied at three application volumes using stationary hydraulic pressure equipment. The commercial rose varieties (Rosa sp) used here were the Orlando and Versilia varieties. The EOW used was slightly acidic type C, pH 5.0, having high-oxide-reduction potential (ORP) +850 millivolts (mV). Two types of EOW were evaluated for this study: EOW C-50 (50 ppm HOCl) and EOW C-75 (75 ppm HOCl). The test results showed the feasibility of EOW as a fungicide at the volumes tested here, providing significant control of powdery mildew which has high incidence due to climatic conditions. The best disease control was achieved by applying the highest volume; however, some curled leaflets appeared with this application.
La evaluación de la aplicación de agua electrolizada oxidante (EO) para el control de Botrytis (Botrytis cinerea), mildeo polvoso (Sphaerotheca pannosa) y mildeo velloso (Peronospora sparsa) en dos variedades de rosa bajo invernadero, tiene como objeto verificar la efectividad de esta nueva tecnología en contraste con el manejo químico tradicional, usando en los ensayos dos concentraciones de ácido hipocloroso en el agua EO, producidas bajo el proceso de electrólisis en la celda P1200 y aplicadas con un equipo estacionario de presión hidráulica a tres volúmenes (V1, V2 y V3). Las variedades comerciales de rosa (Rosa sp) estudiadas fueron dos: var. Orlando y var. Versilia. El agua EO usada fue tipo C, ligeramente ácida, pH 5,0, alto potencial de óxido-reducción (ORP) de +850 milivoltios (mV) con cloro en forma de ácido hipocloroso (HOCL), agua EO C-50 (50 ppm de HOCL) y agua EO C -75 (75 ppm de HOCL). Los resultados de los ensayos muestran la viabilidad del agua EO como fungicida a los diferentes volúmenes evaluados, siendo significativo el control de mildeo polvoso de acuerdo con su alta incidencia por el factor climático. El mejor control de las enfermedades se obtuvo con la aplicación del mayor volumen, aunque con éste también se presentó la aparición de algunos foliolos rizados.
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