Occurrence of Alternaria leaf blight of groundnut in Gujarat and reaction of some genotypes against the disease
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Authors
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VINOD KUMAR*, C. LUKOSE, N.B. BAGWAN, V.G. KORADIA and R.D. PADAVI
Abstract
Outbreak of a hitherto minor disease, Alternaria leaf blight was observed in farmer’s fields during 2009 in summer crop of groundnut in Saurashtra and Kuchchh regions of Gujarat. Though, this disease has been reported to occur two decades ago, this is the first report of its widespread occurrence from any state of India. The characteristic symptoms of the disease are blighting of apical portions of the leaflets, which later curl inward and become brittle giving the leaf a ragged appearance. The pathogen identified was Alternaria alternata (Fr.) Keissler on the basis of its morphological and growth characteristics. The pathogenicity test confirmed the etiology. The disease severity in farmers’ fields in Junagadh and Rajkot districts of Gujarat ranged from zero to 67 percent across the cultivars and crop growth phases. The cultivars, TG-37A, TPG-41 and JL-42 were found more susceptible than others. Losses of crop were in terms of reduced pod and fodder yields. The outbreak of the disease could be due to changes in cropping patterns, the cultivars and the climatic parameters.
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