Synthetic herbivore-induced plant volatile* as field attractants for beneficial insects

摘要

Evidence for field attraction by beneficial insects to synthetic herbivore-induced plant volatiles (HIPV's) is presented. Three synthetic HIPV's (methyl salicylate, (Z)-3-hexenyl acetate and (E)-4,8-dimethyl-l,3,7-nonatriene) were evaluated in a Washington State hop yard during April-October 2002, for attractiveness to beneficial insects. The predatory mirid, Deraeocoris brevis and the anthocorid, Orius tristicolor were attracted to sticky cards baited with (E)-3-hexenyl acetate, while the geocorid,Geocoris pallens and hover flies (Syrphidae) were attracted to methyl salicylate-baited cards. The coccinellid, Stethorus punctum picipes was attracted to both HIPV's in July and September. (E)-4,8-dimethyl-l,3,7- nonatriene did not attract any beneficial insects. Lygus hesperus, Leptothrips mali, Anagrus spp., other Miridae, Coccinellidae and parasitic Hymenoptera were not attracted to the three HIPV's tested. The possible exploitation of HIPV's in enhancing spring populations of beneficial insects, and conservation biological control in cropping systems is discussed.