ALTERNARIA LEAF SPOT [Alternaria alternata (Fr.) Keissler] OF BRINJAL AND ITS MANAGEMENT 3678
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Date
2023-05
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JAU,JUNAGADH
Abstract
Brinjal (Solanum melongena L.) is an important vegetable crop of Saurashtra
belongs to the Family: Solanaceae. In India, it is grown throughout the country. It is
known to affect by many parasitic diseases. Among them, Alternaria leaf spot caused
by Alternaria alternata is an important disease of brinjal, which diminish the quality
and yield under field condition. Considering the economic importance and regular
occurrence of the disease in moderate to severe form in Saurashtra region, the present
study on "Alternaria leaf spot [Alternaria alternata (Fr.) Keissler] of brinjal and its
management" was carried out at the Department of Plant Pathology, Junagadh
Agricultural University, Junagadh using fungicides and also to identify the available
genotypes/varieties resistant against the disease under field condition.
Naturally infected leaf sample of brinjal showing the typical characteristics
symptoms of Alternaria leaf spot disease were collected from the Vegetable Research
Station, JAU, Junagadh. Isolation of the fungus was made by using tissue isolation
method and purified by single spore isolation technique on PDA medium.
The symptoms initially characterized by small, necrotic, scattered, brown,
circular spots with varying size. Later on, it becomes irregular in shape with typical
concentric rings, which coalesced to form big irregular patches on leaves exhibited
blighted appearance and eventually, results into withering and shedding of the leaves.
Pathogenicity of A. alternata was proved by adopting four distinct artificial
inoculation techniques on brinjal leaves viz., pin prick, tooth brush injury, injury by
carborundum powder and spray without injury. Each inoculation techniques
effectively proved the pathogenicity. However, pin prick inoculation method was
more effective than other techniques.