Epidemiology and management of early blight of tomato incited by Alternaria solani
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Date
2018
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CCSHAU
Abstract
Early blight disease caused by Alternaria solani is one of the most important fungal diseases
of tomato (Lycopersicum esculentum). Keeping in view the enormous loss caused by the pathogen, the
present investigation was carried out to study the early blight disease progression in relation to weather
parameters and its management by using the plant extracts, bio-agents and fungicides under both in
vitro and field conditions during Rabi season, 2017-18 at CCS HAU, Hisar. Survey was conducted in
eight villages of two districts (Bhiwani and Hisar) in Haryana and minimum per cent disease intensity
was recorded in village Saral of Bhiwani district. The epidemiological study revealed that early sown
crop was least affected by the early blight disease compared to the timely and late sown crop. The per
cent disease intensity increased with the increased age of the plant. . Mancozeb (75% WP) and
hexaconazole and zineb (72% WP) were found to be most effective among the fungicides under in
vitro condition. Two plants extract (neem leaf extract and combination of garlic clove and green chili
extract) and a bio-agent (Trichoderma viride) was also found effective in inhibiting the mycelial
growth of A. solani among the plant extracts and bioagents, respectively. In field conditions, mancozeb
75% WP was found to be most effective in reducing the early blight disease intensity and increasing
the fruits yield of tomato crop.
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