Effect of wheat plant volatiles on aphids and associated predator behavior: selection of efficient infochemicals for field study
[Objectives] Semiochemicals are involved in tritrophic interactions and affect the behaviors of both herbivores and beneficial insects.Many volatile molecules from the wheat plant [Triticum aestivum L.(Gramineae)] have previously been identified.To understand their effects on aphids and related auxiliaries.[Methods] The impact of four of these volatiles; methyl-salycilate,cis-3-hexenyl acetate,hexenol,and 1-hexanol,was tested on the wheat aphid [Sitobion avenae (Fabricus) (Homoptera:Aphididae)] and two major predators of this pest encountered in field crops,the hoverfly (Episyrphus balteatus (DeGeer) (Diptera:Syrphidae)] and the multicoloured Asian ladybird [Harmonia axyridis (Pallas) (Coleoptera:Coccinellidae)].Different doses of these chemicals were tested by performing four arm-olfactometer and wind-tunnel assays.[Results] The results show that methyl-salycilate seemed to be attractive only toward H.axyridis but 3-hexenyl acetate and hexenol were attractive to both S.avenae and H.axyridis.However,these positive responses decreased with increased dose of the tested compounds.3-hexenyl acetate also induced positive response in E.balteatus but 1-hexanol was more attractive to aphids than to their natural enemies.[Conclusion] In conclusion,these results highlight the potential benefit of combining methyl-salycilate,3-hexenyl acetate and hexenol in push and pull traps aimed to control S.avenae.Contrary to the three aforementioned compounds,1-hexanol did not seem to have much potential as a semiochemical for the biological control of aphids.
NETL
NSTL
万方数据
维普
