Epidemiology and management of anthracnose of chilli (Capsicum annuum) caused by colletotrichum capsici (Sydow) butler and bisby
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Date
2008
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Publisher
CCSHAU
Abstract
Studies on epidemiology and disease management were carried out with
Colletotrichum capsici causing anthracnose of chilli. Emphasis was on the initiation and
progression of the disease in relation to the weather variables. The present study revealed
that the disease development was maximum when the temperature and relative humidity
were 300C and 100 percent, respectively in vitro. In host range studies, the pathogen
infected three crops (mungbean, soybean and bottlegourd) and three weeds (kondhra,
chilmil and santhi). Relationship has also been worked out on spore population, weather
parameters and disease development. Disease development was directly proportional to
the spore production in the field. Further, temperature (maximum) in the range of 30.60-
35.900C, temperature (minimum) 21.70-26.500C, relative humidity (morning) 84.30-
97.00 percent and relative humidity (evening) 54.30-58.30 percent were congenial for
disease development. The regression coefficient of the disease severity and spore
population with weather parameters revealed that temperature (minimum) and
temperature (maximum) played major role which could predict 85 percent of disease
severity and 54 percent of the spore population, respectively. Colletotrichum capsici was
more sensitive to Bavistin which gave complete inhibition of growth at 250 ppm
concentration in vitro. Among the four plant extracts Datura species gave 100 percent
spore germination inhibition which was at par with mancozeb at 0.1% concentration.
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Biological phenomena, Participation, Economic systems, Land resources, Mass media, Marketing, Newspapers, Manpower, Selection, Milling byproducts