Effect of abiotic factors on incidence of major sucking pests on brinjal

An experiment was conducted to observe the effect of abiotic factors on seasonal incidence of major sucking insect-pests on brinjal during kharif-2018 at Experimental farm, Department of Agricultural Entomology, Vasantrao Naik Marathwada Krishi Vidyapeeth, Parbhani (M.S.). The incidence of sucking insect-pest viz., aphid, leaf hopper and whitefly was observed from 29th – 50th (July to December) standard meteorological week (SMW) whereas, mites 37th -50th SMW. The incidence of aphid reached to its peak (15.1 aphid/3 leaves) during 42th SMW (second fortnight of October) and whitefly (23.4 whitefly/3 leaves) during 43th SMW. While, the maximum population of leaf hopper observed during 37th SMW (11.8 leaf hopper/3 leaves) i.e. second week of September. Whereas, highest number of mites recorded during 47th SMW (14.1 mites/4 cm2 leaves). The correlation studies between incidence of aphid and weather parameters showed significant positive correlation (r= 0.503) with Morning relative humidity. The incidence of leaf hopper showed significant positive correlation with Bright sunshine (hrs) (r= 0.508) while, whitefly showed significant positive correlation with Morning relative humidity(r= 0.687) and Bright sunshine (hrs) (r= 0.663).