Toxicity of Normal Pesticides to Dysmicoccus neobrevipes and Field Control Efficiency
To screen chemical agents with strong biological activity to D.neobrevipes,taking 2 nd instar D.neobrevipes nymph as the obj ects,the activities of 1 9 kinds of normal pesticides,including acetamiprid, nicotine and dipterex,were screened by leaf immersion method,then an indoor toxicity test and a field control efficiency test was conducted on pesticides with higher activity.Results:1 )Acetamiprid,beta-cypermethrin,methomyl,fenpropathrin and chlorpyrifos had higher activity,the death rate exceeded 60%after treated with the concentration of 50% for 24 h.2)After treated for 24 h,the toxicity to 2nd instar nymph followed the sequence of chlorpyrifos>acetamiprid>beta-cypermethrin>methomyl>omethoate>fenpropathrin;The toxicity to adult female was chlorpyrifos>acetamiprid>beta-cypermethrin>omethoate> fenpropathrin > methomyl. 3 ) In field control test, all concentrations of acetamiprid, beta-cypermethrin, methomyl, fenpropathrin and chlorpyrifos had excellent activity on D. neobrevipes, especially when the concentration was 1 500 mg/L,the control efficiency of all pesticides except methomyl was over 80% one day later.Conclusion:The occurrence of D.neobrevipes could be effectively controlled by chlorpyrifos,acetamiprid,beta-cypermethrin and methomyl.
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万方数据
维普
