Evaluation of conventional fungicides and disease resistance inducers for the control of downy mildew (Pseudoperonospora cubensis) on melon (Cucumis melo)
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| Autoři: | , , |
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| Médium: | artículo original |
| Stav: | Versión publicada |
| Datum vydání: | 2010 |
| Popis: | 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. |
| Země: | Portal de Revistas UCR |
| Instituce: | Universidad de Costa Rica |
| Repositorio: | Portal de Revistas UCR |
| Jazyk: | Español |
| OAI Identifier: | oai:portal.ucr.ac.cr:article/3629 |
| On-line přístup: | https://revistas.ucr.ac.cr/index.php/agrocost/article/view/3629 |
| Klíčové slovo: | Cucurbitáceas melón mildiú velloso Pseudoperonospora cubensis fungicidas inductores de resistencia vegetal Cucurbits melon downy mildew fungicides plant resistance inducers |