Influence of Weather Parameters on The Occurrence of Major Lepidopteran Pests on Blackgram

摘要

A field experiment was conducted at Agricultural College Farm, Bapatla during rabi 2001 -2002 to determine the occurrence of major lepidopteran pests on blackgram in relation to weather parameters viz., maximum and minimum temperatures, morning and evening relative humidity and sunshine hours. The results indicated positive correlation with morning relative humidity for the spotted pod borer and tobacco caterpillar while maximum temperature, minimum temperature, evening relative humidity and sunshinehours showed negative correation. Minimum temperature and sunshine hours contributed to the extent of 52.03 and 50.84 per cent out of the total variation of 68.19 and 65.62 per cent by all weather factors in respect of larval incidence of spotted pod borer and tobacco caterpillar.