Occurrence and pesticides selection of Planococcus vovae in the urban area of Beijing
[Objective]As a new invasive insect,there was relatively little research on the occurrence patterns and chemical control of Planococcus vovae.By investigating the occurrence of Planococcus vovae in the urban area of Beijing and screening of efficient and low-toxicity pesticides,the aim was to clarify the scope and degree of harm caused by P.vovae on cypress trees,and provide a scientific basis for the prevention and control of P.vovae.[Methods]Investigated the occurrence of P.vovae in six urban areas of Beijing,and conducted laboratory and field pesticides screening experiments.[Results]A total of 2 354 cypress trees were investigated,with ratio of infected trees of 44.90％and pest index of 2.25.The occurrence in Dongcheng District was relatively serious,with ratio of infected trees of 72.34％and pest index of 3.56.The occurrence in Haidian District was relatively mild,with ratio of infected trees of 10.98％and pest index of 0.36.After 7 days of chemical treatment in labora-tory,the 20％imidacloprid soluble agent,4％avermectin-acetamidine emulsion,25％buprofezin suspension agent and 28％avermectin-spirodiclofen suspension agent showed better control effects,with corrected mortality rates of 100％,100％,96.00％,and 92.00％respectively.After 7 days of chemical treatment in field,both 20％imidacloprid solution and 4％aver-mectin-acetamidine emulsion had the best effect of 100％.[Conclusion]P.vovae have been widely found on cypress trees in the urban area of Beijing.20％imidacloprid soluble agent and 4％avermectin-acetamidine emulsion have good control effects and can be used as the main pesticides for P.vovae control.
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