Eficiência de alguns fungicidas no controle da queima das folhas (Alternaria dauci (Khun) Groves e Skolko da cenoura (D
Palavras-chave:
queima folhagem, cultivo cenoura, pulverização fungicida, tratamento sementes, incidência enfermidadeResumo
Carrot leaf blight, caused by Alternaria dauci (KUhn) Gro- ves e Skolko, is a serious disease during the rainy season. In this research, the efficacy of 9 fungicides: Kauritil (0,25%), Fultosan (0,50%), Manzate-D (0,24%), Brema (0,20%), Batasan (0,10%), Phygon XL (0,12%), Difolatan (0,20%), Daconil (0,18%) and Benlate (0,20%) was studied for the control of leaf blight on cultivars 'Meio Comprida de Nantes" and "Shin Kuroda" believed to be susceptible and tolerant respectively to the disease.
The experimental design used was a randomized block with 4 replications and split for treatments. Sowing was done in January 73 and the spray program was started 3 weeks later. Seven spray applications were made at 10 day intervals, using a manual sprayer.
Blight incidence on the leaves and yield were evaluated. It was found that Difolatan at 0,20% was the most efficient fungicide mixture, followed by Batasan at 0,10%. The treatments with Phygon XL at 0,12% and Benlate at 0,20% were inferior to the control (not sprayed), reflecting some demage to the plants. As a result of this study the cultivar Nantes is not re- commended for planting during the warm, rainy season in the Goidnia area. Cultivar Kuroda showed good climatic adaptation and reasonable tolerance to Alternaria leaf blight. Although requiring some protective sprayings, Kuroda represents a via- ble option during the warm and rainy period of the year
Referências
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