In order to estimate their trapping effect on wheat aphids and their natural enemies, yellow sticky card traps were setup in

wheat fields at the Luancheng agroecosystem station of the Chinese Academy of Science in Hebei Province in 2010 and 2011. More than 30 species of insect from 7 orders were trapped; the dominant species captured was a fly species rather than wheat aphids. The effectiveness of yellow sticky card traps for trapping wheat aphids was significantly correlated to the

population size per 100 tillers when application of chemical pesticides in sampling area were under control and was not significant without such control. Yellow sticky card traps can kill a large number of natural enemies of the wheat aphid. The ratio of trapped natural enemies and pest insects before and after the grouting stage were both greater than 1, with the maximum ratio up to 45.50. In view of the effectiveness of yellow sticky card traps in catching wheat aphids and their natural enemies and the potential influence of weather conditions and other factors, these traps are not recommended for controlling wheat aphids but can be used as a tool for monitoring these pests.