| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 4506879 | Crop Protection | 2011 | 6 Pages |
The effectiveness of eleven foliar-applied fungicides on faba bean rust (Uromyces viciae-fabae (Pers.) J. Schröt.) and on the seed yield of faba bean (Vicia faba L.) were studied in growth chambers and in the field in Spain. Fungicides were tested at recommended and reduced rates. All the fungicides tested provided very effective preventive control in the growth chamber studies. Triazoles (difenoconazol, epoxiconazol, tebuconazol) and their mixtures with benzimidazoles (carbendazim-flutriafol and carbendazim-flusilazole) provided the most effective curative effect, even at 25% of recommended concentrations. They were followed by dithiocarbamates, copper dithiocarbamate mixture, carboxamide and chlorothalonil. Triazoles, benzimidazole-triazole mixtures and carboxamide maintained their effect until 15 days after fungicide application.Under field conditions, rust infection caused 22–26% yield reduction. All fungicides except mancozeb caused a significant decrease in disease severity under field conditions, but only treatments with triazoles and benzimidazole-triazole mixtures provided significant yield increases (22.7–15.6%) when applied twice. Three applications of oxycarbosin or copper-mancozeb were needed to provide a significant yield increase. Dithiocarbamates (thiram, maneb or mancozeb) or chlorothalonil reduced rust severity but did not provide a significant yield increase.
► All fungicides studied (difenoconazol, epoxiconazol, tebuconazol, carbendazim-flusilazole, carbendazim-flutriafol, thiram, maneb, mancozeb, copper-mancozeb, oxycarboxin and chlorothalonil) had a good protective effect on faba bean rust. ► Triazoles and their mixtures with benzimidazoles provided the most effective curative effect, even at 25% of the recommended concentrations. ► Triazoles incited host cell necrosis associated with aborted colonies as seen microscopically. ► Under field conditions, rust infection caused 22–26% yield reduction. ► All fungicides caused a significant disease severity under field conditions, but only triazoles and benzimidazole-triazole mixtures provided significant yield increases when applied twice. Three applications of oxycarbosin or copper-mancozeb were needed to provide a significant yield increase.
