Population dynamics and evaluation of certain bio-products against brinjal leafhopper, Amrasca bigutulla bigutulla in Allahabad condition

The incidence of leafhopper Amrasca bigutulla bigutulla on brinjal commenced from 6^th week after sowing i.e. second week of October (41^st standard week) with an average population level of 0.03 leafhopper/plant during 1^st year and in 2^nd year it started from second week of October (41^st standard week) with an average population level of 0.15 leafhopper/leaf. Maximum population of leafhopper was observed during February (5^th week) to March (1^st week). The leafhopper incidence showed positive correlation with maximum relative humidity, rainfall, wind speed and sunshine hrs. Chlorpyriphos was significantly superior as compared to botanicals.