Epidemeology and management of mungbean anthracnose caused by colletotrichum truncatum (Schw.) andrus and moore
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Date
2006
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Publisher
CCSHAU
Abstract
Studies on epidemiological and disease management
through non-conventional chemicals as well as bioagents were carried
out with Colletotrichum truncatum causing anthracnose of mungbean.
The disease development was maximum when the temperature and
relative humidity were 30ÂșC and 90-100 per cent respectively in vitro.
Pre and Post inoculation moist period studies revealed that minimum
post inoculation moist period for initiation of disease was 12 hours with
maximum infection at 72 hours. However, pre inoculation moist period
resulted in increased infection but was not as effective as post
inoculation period for disease development under screen house
conditions Trichoderma viride was most effective in reducing the growth
of the pathogen. In studies with non-conventional chemicals salicylic
acid at the concentration of 5mM induced resistance in plants and gave
74.36 and 83.33 per cent disease control over check in susceptible and
resistant variety under screen house conditions. Least reduction in
disease control was recorded when zinc sulphate and magnesium
sulphate sprayed. Biochemical analysis studies indicated that there
was pronounced increase in total phenol content in resistant and
susceptible varieties when sprayed with salicylic acid at 5mM
concentration. However, total and reducing sugars were significantly
decreased in resistant as well as susceptible variety when sprayed with
non-conventional chemicals and fungicide at 24 and 48 hours after
pathogen inoculation. There was sharp decrease in total sugar with
salicylic acid spray at 48 hours after pathogen inoculation. Electrolyte
leakage was more pronounced in resistant variety as compared to
susceptible variety with salicylic acid spray at 5mM concentration. Out
of twenty one mungbean lines screened against this disease under
artificial disease stress conditions, two lines viz. IPM 99-125 and TM
2000-58 were found to be moderately resistant to this disease.