Population dynamics of thrips, Scirtothrips dorsalis hood infesting Bt cotton ecosystem in middle Gujarat
SR Padaliya, RK Thumar, MD Aniyaliya and BG Timbadiya
A study on population dynamics of thrips, Scirtothrips dorsalis Hood on Bt cotton was conducted at Anand Agricultural University, Anand during Kharif 2017-18. The incidence of the pest started from last week of July to end of crop season with peak activity in 2nd week of December. The higher activity of this pest was noticed during November and December (8.24 to 14.24 thrips/leaf). The correlation coefficient data indicated that rainfall (r=-0.54**), wind speed (r=-0.61**), minimum temperature (r=-0.92**), morning relative humidity (r=-0.67**), evening relative humidity (r=-0.84**), morning vapour pressure (r=-0.92**) and evening vapour pressure (r=-0.82**) were highly significant negatively correlated with thrips population. The bright sunshine hour(r=0.57**) and evening vapour pressure deficit (r=0.65**) had highly significant positive correlated with the activity of thrips.