Author(s):

NB Patel, NA Bhatt and CC Patel

Abstract: An experiment was carried out to evaluate the effect of weather parameters on incidence of Tetranychus urticae Koch on brinjal during kharif-rabi 2014-15 and 2015-16. Population of T. urticae revealed that infestation of mite started from 39^th standard meteorological week (SMW) with lower number and then it gradually increased up to 44^th SMW. Thereafter, population was fluctuating in the field up to 2^nd week of February and reached to peak at harvesting (13^th SMW). Population of phytoseiid predator, Amblyseius alstoniae Gupta was first observed during 42^nd SMW with very low population and disappeared from the field during December to January. Thereafter, it gradually increased and reached to maximum during 12^th SMW as the maximum temperature reached to more than 38 ⁰C. The correlation studies on population of mite, T. urticae and its predator, A. alstoniae with weather parameters showed significant positive correlation with maximum, minimum and average temperature while, significant negative correlation with morning, evening and average relative humidity. There was a highly significant positive correlation between predatory mite, A. alstoniae and T. urticae (r= 0.929**) on brinjal crop.

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