Efficacy of different coloured sticky traps against thrips of onion

抄録

The present field study was conducted to test the efficacy of different colored sticky traps to attract thrips (Thrips tabaci) in onion. The treatments were blue trap at 40 trap/ha, yellow trap at 40 trap/ha, white trap at 40 trap/ha, green trap at 40 trap/ha and transparent trap at 40 trap/ha. Onion cultivar BARI Piaz-1 was used as test crop for this trial. Observation was taken from sticky trap weekly from transplanting till harvesting. Treatments were assigned in a randomized complete block design with three replications. Among the color traps used, at 35 days after installation (DAI) of trap blue color attracted the highest (8.46 thrips/sq inch area of trap) number of T. tabaci adults followed by white (5.45 thrips/ sq inch area of trap), yellow (4.32 thrips/sq inch area of trap), green (3.54 thrips/ sq inch area of trap) and transparent (3.42 thrips/sq inch area of trap) color. Blue coloured sticky trap also attracted comparatively less number of beneficial insects compared to white, yellow, green and transparent trap. Sticky blue colored trap may be used as a component of IPM program for monitoring and mass trapping of thrips in the onion field.