Study on Traps of Different Colors on Trapping Rate to Chrysopa perla

The trap effect of traps of six colors to Chrysopa perla was studied.The results showed that traps in different colors had different trapping effects.The red and the green traps reduced trapping effect best,with 84.47% decreased.The yellow and the blue traps reduced trapping effect with 75.53% and the black one reduced 66.67%.This offered a reference of avoiding trapping beneficial insects and improving the efficiency to trap Grapholitha molesta.