Effect of abiotic factors on seasonal fluctuation of major phototectic insect pests of rice

Abstract

Major activity period of M. separata (Walker) was observed from 33rd to 52nd SW (13 Aug. to 31 December 2014). L. acuta (Thunberg) was active from 31st to 46th SW (30 July to 18 Nov. 2014). N. virescens (Distant) was observed from 27th to 47th SW (02 July to 25 Nov. 2014). T. subulata (Linnaeus) activity was observed from 26th to 48 SW (25 June to 02 Dec. 2014) respectively. Among all the abiotic factors, rainfall and morning relative humidity were showed significantly negative correlation with M. separata sp. (r= -0.452*and-0.040 byx), (r= -0.450*and 0.108 byx), evening vapor pressure had significantly negative correlation (r= -0.394*and 0.470 byx) with N. virescens while minimum temperature, rainfall and morning relative humidity and evaporation has significantly positive correlation with the activity of T. subulata (r= +0.541** and byx= +0.104) (r= +0.529** and byx= +0.004) (r= +0.544** and byx= +0.016) (r= +0.561** and byx= +0.209).