Efecto del fungicida iprodione y sus mezclas con thiram y triticonazole en el control de Drechslera teres en semillas de cebada

AUTOR(ES)
FONTE

Fitopatologia Brasileira

DATA DE PUBLICAÇÃO

2001-06

RESUMO

Net blotch is the most important barley (Hordeum vulgare) disease in Argentina. The seed chemical treatment is an important measure to avoid the introduction and dispersion of D. teres. The objectives of the present study were: 1) to evaluate in vitro the fungicide iprodione in different dosages and its mixtures with triticonazole and thiram and to compare them to the most common fungicides used (tebuconazole and flutriafol), and 2) to study under field conditions, the best treatment achieved in vitro. Seed treatment studies indicated that the fungicides used in Argentina such as tebuconazole and flutriafol were less effective against D. teres than iprodione (50 g i.a.), iprodione + triticonazole, and iprodione + thiram. The number of focuses of primary infection, incidence, severity, and agronomic yield in paired plots with iprodione + triticonazole and without fungicide were measured in field. Differences in the valued of these variables were significant among parcels indicating the importance of seed infection in the epidemiology of the disease. It concludes that the mixture of iprodione + triticonazole was effective against D. teres both in vitro and un the field significantly decreasing the incidence of net blotch epidemic.

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