Abstract: In this paper, the extracts of wheat flowers and wheat leaves (1 000 g and 3 200 g respectively) were drawn forth both by ethyl ether and steam distillation. The four samples were concentrated to two milliliters each by nitrogen. Activity of the extracts attracting cotton bollworm moths was tested by wind-tunnel and electroantennographic responses. In wind tunnel, the result showed that. (1) the volatile secondary metabolites from wheat flowers and wheat leaves possess attractive effect on cotton bollworm moths. The orientation rate were 45% to 72%, much higher than 22.2% of control, with significent difference by t test; (2)the orientation rates of females were higher than those of males; and (3) there were no significant difference between flowers and leaves. On EAG test, the result showed that antenna of cotton bollworm strongly responsed to the extracts of wheat flowers and leaves with significent difference to the control. EAG response of male was slightly higher than that of female, and the EAG response of cotton bollworm to wheat flower extract was slightly higher than to leave extract.

Key words: wheat, volatile secondary metabolites, Helicoverpa armigera (Hubner), behaviour, electroantannogram