5种杀虫剂对梨冠网蝽室内毒力测定及药剂筛选

【目的】 筛选对梨冠网蝽若虫、成虫具有良好防效的杀虫剂,为梨冠网蝽的药剂防治提供参考。【方法】 选用5种药剂采用室内浸叶生测法对梨冠网蝽进行毒力测定。【结果】 45%毒死蜱EC 800、1 000倍液,25%噻虫嗪WG 500、1 000倍液, 20%啶虫脒SP 500、1 000倍液对梨冠网蝽具有较好的防治效果,且每个药剂各浓度之间防效并无显著差异,对若虫的LC₅₀值分别为497.47、574.765、589.343 6 mg/L;对成虫的LC₅₀值分别为505.445、545.484、596.254 6 mg/L。这5种药剂的毒力排序为45%毒死蜱EC>25 g/L高效氯-氰菊酯EC>20%啶虫脒SP>25%噻虫嗪WG>6%阿维氯苯酰SC。【结论】 5%毒死蜱EC 800、1 000倍液,25%噻虫嗪WG 500、1 000倍液, 20%啶虫脒SP 500、1 000倍液可用于梨冠网蝽的防治。

Indoor Toxicity Test and Pesticide Screening of Five Pesticides to the Stephanitis nashi Esaki et Takeya

【Objective】 In order to screen out insecticides with good control effect on nymphs and adults of Stephanitis nashi Esaki et Takeya, and provide references for the control of the pest. 【Methods】 The toxicity of five insecticides to the Stephanitis nashi Esaki et Takeya was determined by the method of leaf immersion bioassay in laboratory. 【Results】 45% chlorpyrifos EC 800, 1,000 times liquid, 25% thiamethoxam WG 500, 1,000 times liquid, 20% acetamiprid SP 500, 1,000 times liquid had better control effect on Stephanitis nashi Esaki et Takeya. The LC₅₀ values of nymphs were 497.476, 574.765, and 589.343 mg/L, respectively; the LC₅₀ values for adults were 505.445, 545.484, and 596.254 mg/L respectively. The virulence of these five agents ranked as 45% chlorpyrifos EC > 25 g/elevated potency Cyhalothrin EC > 20% acetamiprid SP > 25% thiamethoxam WG > 6% averochlorobenzoyl SC.【Conclusions】 5% chlorpyrifos EC 800, 1,000 times liquid, 25% thiamethoxam WG 500, 1,000 times liquid, 20% acetamiprid SP 500, 1,000 times liquid can be used for the prevention and treatment of Stephanitis nashi Esaki et Takeya.