Influences of wheat-cotton intercropping on Aphis gossypii control and pesticide reduction in cotton fields
[Aims]The role of wheat-cotton intercropping in the effective control of Aphis gossypii in cotton fields were evaluated to provide a basis for optimizing crop layout,utilizing natural enemies,and reducing pesticide application.[Methods]The field plot spray experiments were conducted to compare the control effect of imidacloprid and flonicamid against A.gossypii in wheat-cotton intercropping cotton fields and monoculture cotton fields with local conventional dosage and dosages reduced by 10％to 40％.[Results]The control effects of imidacloprid and flonicamid against A.gossypii decreased with the reduction of dosage in monoculture cotton fields.On day 1,3 and 7,the control effect of the treatments of imidacloprid reduced by 20％and 30％against A.gossypii in intercropping cotton fields were 10.1％and 13.2％,8.5％and 13.1％,14.7％and 20.8％higher than that in monoculture cotton fields,respectively.The treatment with 20％and 30％reduction of flonicamid resulted in a higher control effect than monoculture cotton fields on day 1,3,and 7 after treatment by 9.2％and 6.1％,10.3％and 6.1％,7.4％and 8.7％,respectively.[Conclusions]Imidacloprid and flonicamid reduced by 10％to 40％have better control effect against A.gossypii in wheat-cotton intercropping cotton fields than in monoculture cotton fields.
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