Occurrence regularity and screening of prevention and control agents cowpea thrips in Guangxi
In order to clarify the population dynamics of cowpea thrips in Nanning,Guangxi and screen out insecticides with better control effect,a survey was conducted to investigate the number and distribution of cowpea thrips in different plant parts through blue plate trapping,and field trials of 9 insecticides were carried out.The peak number of blue plate traps were late May to early June and late June.Surveys of different parts of the plant showed that cowpea thrips have a preference for flowers,representing the peak date of the population overlapped with the full blooming period.Then,some thrips transferred to the beans after flowering,resulting in a decrease in the population.Two insecticides with significant control effects,including 60 g·L-1 ethyl polysulfide SC and 6％bifenthrin acetamiprid ME,were selected in the field pes-ticide experiment.The insecticides had a control effect of 82.0％and 73.4％after 1 day of treatment,respectively,and had a duration of 7-10 days,which can be used altemativey for field control of cowpea thrips.
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