Evaluation of conventional fungicides and disease resistance inducers for the control of downy mildew (Pseudoperonospora cubensis) on melon (Cucumis melo)

 

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Autors: Méndez Leiva, William, Arauz, Luis Felipe, Ríos, Rodrigo
Format: artículo original
Estat:Versión publicada
Data de publicació:2010
Descripció:Cucurbit downy mildew, caused by the oomycete Pseudoperonospora cubensis (Berck & Curtis) Rostovtsev, is one of the most important diseases of melons in Costa Rica. The control of downy mildew by the application of conventional fungicides in combination with resistance inducers was inves-tigated on melon (Cucumis melo L.) cv. ‘Ruide ra’. Two systemic fungicides, mefenoxam (1.96 kg a.i.ha-1) and dimethomorph (0.45 kg a.i.ha-1), and a sequence of the protectant fungicides chlorothalonil/mancozeb (2.01/1.20 kg a.i.ha-1), were applied, by themselves or in combination with application of each of 3 resistance inducers, phosphite (1.01 kg a.i.ha-1), menadione sodium bisulphite (MSB, 0.14 kg a.i.ha-1) and acibenzo-lar-S methyl (ASM, 0.02 kg a.i.ha-1). Controls with no fungicides or no inducers were included in the experiment. Significant differences ( p < 0.05) in area under the disease progress curve (AUDPC) were observed among fungicides. The lowest values of AUDPC were obtained with the chlorothalonil/mancozeb sequence, and with dimethomorph. Mefenoxam was not effective. The combination with phosphite improved the efficacy of all the conventional fungicides. No effect in disease con-trol was observed with the application of MSB or ASM, either alone or combined with conventional fungicides. The treatments chlorothalonil/manco-zeb and dimethomorph were less expensive than other treatments with lower efficacy.  
Pais:Portal de Revistas UCR
Institution:Universidad de Costa Rica
Repositorio:Portal de Revistas UCR
Idioma:Español
OAI Identifier:oai:portal.ucr.ac.cr:article/3629
Accés en línia:https://revistas.ucr.ac.cr/index.php/agrocost/article/view/3629
Paraula clau:Cucurbitáceas
melón
mildiú velloso
Pseudoperonospora cubensis
fungicidas
inductores de resistencia vegetal
Cucurbits
melon
downy mildew
fungicides
plant resistance inducers