Study on the Control Effect of 4 Kinds of Insecticides on Asterococcus muratae Kuwana
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摘要: 为了筛选日本壶链蚧有效防控药剂,本研究采用玻片浸渍法和离心管药膜法测定了4种药剂对日本壶链蚧初孵若虫的毒力,并通过喷雾试验测定室外防效.结果表明,玻片浸渍法测定4种药剂毒力,依次为25%噻嗪酮WP、2%甲氨基阿维菌素苯甲酸盐EC、22.4%螺虫乙酯SC、99%矿物油EC,LC50分别为39.87 mg/L,56.99 mg/L,722.27 mg/L,2 223.51 mg/L;离心管药膜法测定毒力,依次为25%噻嗪酮WP、2%甲氨基阿维菌素苯甲酸盐EC、99%矿物油EC、22.4%螺虫乙酯SC,LC50分别为20.48 mg/L,193.76 mg/L,2 865.86 mg/L,6 235.52 mg/L.室外药效试验显示,施药后56 d通过体视显微镜观察,25%噻嗪酮WP 1 000倍液防效可达100%,虫体死亡,呈红黑色无蜕皮壳,而99%矿物油EC 200倍液、22.4%螺虫乙酯SC 2 000倍液、2%甲氨基阿维菌素苯甲酸盐EC 1 000倍液处理组防效仅为3.28%~15.45%.综上,25%噻嗪酮WP对日本壶链蚧初孵若虫的毒力最高且防效优异,适合用于园林植物日本壶链蚧防控.Abstract: In order to screen the effective control agents of Asterococcus muratae Kuwana, the virulence of four kinds of pesticides to newly hatched nymphs of Asterococcus muratae Kuwana was determined by glass slide dipping method and centrifuge tube film method, and the outdoor control effect was determined by spray test. The results showed that the order of toxicity of the four reagents determined by glass slide dipping method was 25% thiazone WP, 2% amamectin benzoate EC, 22.4% spirotethyl SC and 99% mineral oil EC, with LC50 of 39.87 mg/L, 56.99 mg/L, 722.27 mg/L and 2 223.51 mg/L, respectively. The order of toxicity determined by centrifuge tube film method was 25% thiazinone WP, 2% amamectin benzoate EC, 99% mineral oil EC and 22.4% Spirotethyl SC, with LC50 of 20.48 mg/L, 193.76 mg/L, 2 865.86 mg/L and 6 235.52 mg/L, respectively. The outdoor efficacy test showed that 56 days after application, the control effect of 1 000 times dilution of 25% thiazinone WP could reach 100%. The dead insects showed red black body without molting shell. The control efficiency of 200-fold solution of 99% mineral oil EC, 2 000-fold solution of 22.4% spirulina ethyl ester SC and 1 000-fold solution of 2% amamectin benzoate EC was only 3.28%~15.45%. In conclusion, 25% thiazinone WP has the highest virulent effect and excellent control effect on the initial hatchling nymphs of Asterococcus muratae Kuwana, which is suitable for the control of this pest in garden plant.
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Key words:
- insecticide /
- Asterococcus muratae Kuwana /
- toxicity determination /
- outdoor control effect .
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