摘要
[目的]评估麦棉邻作在棉田棉蚜防控中的作用,为优化作物布局、利用天敌及减少农药施用提供依据.[方法]采用田间小区试验,分析吡虫啉和氟啶虫酰胺于麦棉邻作棉田和棉花单作田在本地常规用量及减量10％～40％后对棉蚜的防效.[结果]棉花单作田吡虫啉和氟啶虫酰胺处理,随剂量降低防效呈下降趋势.麦棉邻作棉田吡虫啉减量20％和30％处理,药后1、3、7 d对棉蚜防效较棉花单作田分别高10.1％和13.2％、8.5％和13.1％、14.7％和20.8％;氟啶虫酰胺减量20％和30％处理,药后1、3、7 d防效较棉花单作田分别高9.2％和6.1％、10.3％和6.1％、7.4％和8.7％.[结论]吡虫啉和氟啶虫酰胺减量10％～40％对棉蚜防效在麦棉邻作棉田中优于单作棉田.
Abstract
[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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