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Environmental factors like temperature, relative humidity and light must be favourable for the infection to takes place. The
optimal requirements of these factors vary with different species of plant pathogens. To find out the effect of environmental
factors on chilli fruit rot infection, the surface sterilized, healthy chilli fruits artificially inoculated with conidial suspension
(concentration of 106 conidia/ml) of Colletotrichum capsici and incubated at different temperatures (includes 15, 20, 25, 30,
35 and 400C), relative humidity levels (includes 75, 80, 85, 90, 95 and 100%) and light regimes (includes continuous light,
continuous darkness, 18 h darkness followed by 6 h light period and18 h light followed by 6 h darkness period), respectively. Ten
days after inoculation recorded the data on lesion size and per cent disease index (PDI). The highest lesion size (15.10 mm) and
PDI (38.50) were recorded when the inoculated chilli fruits were incubated at temperature of 250C. Temperature beyond and
below 250C caused significant reduction in both lesion size and per cent disease index (PDI). Among the four light regimes, 18
h light followed by 6 h dark period was optimum (recorded the highest lesion size (8.96 mm) and PDI (61.05)) for chilli fruit
rot development. The inoculated chilli fruits incubated at relative humidity of 95 per cent reported the highest infection (lesion
size (21.00 mm) and PDI (59.90)). When the relative humidity was decreased to 75%, the lesion size and per cent disease index
showed a sharp decrease.
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