Seasonal incidence and management of onion thrips Thrips tabaci L. on marigold

Studies were conducted on the seasonal incidence of Thrips tabaci L. during 2014–15 at the University Research Farm, Sher-e-Kashmir University of Agricultural Sciences and Technology-Jammu. The incidence of T. tabaci was 0.68 thrips plant⁻¹ in the 7^th standard week and reached its maximum 3.49 thrips plant⁻¹ in the 12^th standard week. The mean maximum temperature (r = 0.721**) and minimum temperature (r = 0.768**) had positive but highly significant effect on thrips population. The mean relative humidity (morning) (r =-0.627*) and rainfall (r =-0.393*) had negative significant effect, while as mean relative humidity (evening) (r =-0.502) had negative effect. The evaluation of efficacy of insecticides against T. tabaci revealed that thiamethoxam 25EC (0.100%) was the most effective followed by imidacloprid 200SL (0.008%), methyl-o-demeton 25EC (0.030%), carbosulfan 250EC (0.003%), neem oil 5% (0.050%), novaluron 10EC (0.100%) and bifenthrin 10EC (0.050%).