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Reference: Effectiveness of isofetamid, a new succinate dehydrogenase inhibitor fungicide, in the control of grapevine gray mold
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Gray mold is an important disease in grapevines in Chile, and its control depends primarily on the use of fungicides with a single-site mode of action. Botrytis cinerea has a high risk of developing resistance against such fungicides. Therefore, novel chemical options are needed to achieve satisfactory control of gray mold. Isofetamid is a new succinate dehydrogenase inhibitor (SDHI) fungicide with a single-site of action that inhibits cellular respiration and appears to be a new option in the chemical treatment against gray mold. The aim of this study was to determine the effectiveness of isofetamid in controlling grapevine gray mold in Chile. Field trials undertaken in three different commercial vineyards showed that isofetamid controls gray mold to a similar extent as fenhexamid. During 2012 and 2013, 10 B. cinerea isolates were obtained from commercial vineyards in central Chile to determine their sensitivity to isofetamid. The median inhibitory concentration of isofetamid varied between 0.3-10.0 µg mL-1 and 0.6 to >10 µg mL-1 for mycelium and conidia, respectively. The efficacy of isofetamid against B. cinerea in apple bioassays varied between 61-100% and 37.5-100% for mycelium and conidia, respectively. The results of this study demonstrate that isofetamid is a highly effective fungicide against B. cinerea.
El moho gris (Botrytis cinerea) es una enfermedad importante de la vid (Vitis vinifera) en Chile. En los últimos años el control se ha basado en la utilización de fungicidas de modo de acción específico lo que conlleva a un alto riesgo de desarrollo de resistencia. Por lo tanto, se necesitan nuevas opciones químicas para lograr un control satisfactorio de moho gris. Isofetamida es un nuevo fungicida de sitio específico que actúa inhibiendo la respiración celular. Este fungicida se presenta como una nueva opción en el control químico contra el moho gris. El objetivo de este estudio fue determinar la efectividad de isofetamida en el control del moho gris de la vid en Chile. Las pruebas de campo se realizaron en tres viñedos comerciales donde isofetamida demostró tener alta eficacia, similar a fenhexamida, sobre el moho gris. Durante 2012 y 2013, 10 aislamientos se obtuvieron de diferentes viñedos comerciales en el centro de Chile. La concentración mediana efectiva de isofetamida varió entre 0,3 a 10,0 µg mL-1 y 0,6 a > 10 µg mL-1 para micelio y conidias respectivamente. La eficacia de isofetamida contra B. cinerea varió entre 61.0-100.0% y 37.5-100.0%, en bioensayos de manzanas inoculadas con micelio y conidias respectivamente. Los resultados de este estudio demuestran que isofetamida es un fungicida altamente eficaz contra B. cinerea.

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Publication Details

Published: 2014
Publication: Ciencia e investigacion agraria
Issue: 2014 41-3
Author: Piqueras C 2014


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