Effects of different functional plants on cotton aphids and their predatory natural enemies
In order to determine the regulatory effect of four functional plants,i.e.,Cnidium monnieri,Brassica napus,Mentha haplocalyx and Ocimum basilicum,on cotton aphids and their predators,the population dynamics of cotton aphids and their predators were determined by systematic field investiga-tion and selective behavioral response trials in the laboratory.The results showed that the four function-al plants could conserve predatory natural enemies such as Hippodamia variegata,Chrysoperla sinica and Orius sauteri,among which Cn.monnieri could attract the largest population of predatory natural enemies,reaching 821 individuals.The populations of H.variegata and Ch.sinica on cotton next to Cn.monnieri planting area were significantly higher than those in the control area,while the populations of Aphis gossypii,Acyrthosiphon gossypii and Ap.craccivora on cotton were significantly lower than those in the control area.The population size of Ch.sinica on cotton next to B.napus planting area was signif-icantly higher than that in the control area,and that of Ac.gossypii on cotton was significantly lower than in the control area.The populations of H.variegata and Ch.sinica on cotton next to Mentha haplo-calyx planting area were significantly higher than those in the control area,while the populations of Ap.gossypii and Ac.gossypii on cotton were significantly lower than those in the control area.The popula-tion sizes of Ac.gossypii and Ap.craccivora next to Ocimum basilicum planting area were significantly lower than those in the control area.The populations of Ap.gossypii and Ac.gossypii had a significant negative correlation with the total population of predatory natural enemies.The plant volatiles of Cn.monnieri and O.basilicum significantly attracted H.variegata and Ch.sinica.The plant volatiles of O.basilicum and M.haplocalyx tended to significantly expel the winged cotton aphids.The results indicat-ed that the functional plants Cn.monnieri,B.napus,M.haplocalyx and O.basilicum could conserve the natural enemies in cotton fields,while M.haplocalyx and O.basilicum could also expel cotton aphids and be used for ecological regulation of cotton pests and natural enemies.
万方数据
维普
