Abstract
ABSTRACT The influence of abiotic factors viz., temperature and relative humidity on the germination of urediospore of Hemileia vastatrix Berkeley & Broome, the coffee leaf rust pathogen was assessed under in-vitro conditions. The laboratory study was carried out to find the percentage germination of urediospores at different temperatures of 18, 20, 22, 24 and 26o C and at various relative humidity (RH) levels of 50, 60, 70, 80 and 90%. The results indicated that maximum germination of urediospore of the coffee rust fungus was observed at 24o C (48.60%) and 70% relative humidity (40.80%). The percentage germination of urediospore was affected when the temperature was decreased to 18o C (33.00%) and also increased to 26o C (36.20%). Spore germination was reduced to 31.60% at 50% relative humidity and 26.40% at 90% relative humidity levels set for the experiment.
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