Effect of different color sticky traps on control for onion thrips

The present experiment was carried out with the objective to find out the effect of different color sticky traps for control of thrips in onion. A field experiment was conducted at Regional Research Station, NHRDF Karnal, Haryana, India for two consecutive years during 2019-20 and 2020-21 in the rabi season on onion variety NHRDF Red. Result showed that over all highest number of thrips was stuck (11.53 thrips) on the sticky traps were recorded in treatment T4 (4 No. Yellow sticky traps). The overall average lowest thrips population (3.43thrips/plant) was recorded in treatment T10 (Standard check spray of insecticide Fipronil 1.0 ml/L). The highest gross yield (359.45q/ha) and marketable yield (348.25q/ha) were recorded in the T10 treatment. The B:C ratio (9.06:1) was also recorded in the same treatment however benefit-cost ratio was negative in all sticky traps due to their higher cost. The highest thrips population and lowest yield were recorded in the control treatment. Sticky traps more effective for early detection and monitoring of the thrips population in onion.