应用叶片保护率与校正死亡率评价阿维菌素与氟虫腈对小菜蛾3龄幼虫的毒力  被引量:5

Indoor Toxicity Assessment of Avermectin and Fipronil on 3^(rd) Instar Larvae of Diamondback Moth by Means of Leaf Protection Rates and Corrected Mortality Rate

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作  者:顾晓军[1] 田素芬[1] 刘文静[1] 

机构地区:[1]福建农林大学应用生态研究所,福州350002

出  处:《中国农业科技导报》2009年第2期98-105,共8页Journal of Agricultural Science and Technology

基  金:福建农林大学青年教师基金(B0403);福建省自然科学基金(B0410015);福建省青年科技人才创新项目(2004J010);福建省教育厅项目(2007F5021);福建省高等学校新世纪优秀人才支持计划资助

摘  要:研究了阿维菌素、氟虫腈两种药剂对小菜蛾[Plutella xylostella(Linnaeus)]3龄幼虫的毒力及对其取食的影响。Potter喷雾法处理后,两种农药处理中的试虫校正死亡率均随着时间的推移而逐渐升高,但叶片保护率却有降低趋势,且在阿维菌素低浓度处理中更明显。浸叶法处理后,试虫校正死亡率与叶片保护率均随时间的推移而升高,在阿维菌素的72h处理中,除了10.00mg/L、0.31mg/L两个浓度处理中试虫校正死亡率与叶片保护率相近外,其余均为叶片保护率显著高于校正死亡率。而氟虫腈的处理中,则除了12.50mg/L浓度处理中的叶片保护率与试虫校正死亡率相近外,其余均为试虫校正死亡率与叶片保护率相近。最后讨论了叶片保护率在农药毒力评价中的意义。The indoor toxicities of avermectin and fipronil on the 3rd instar larvae of diamondback moth [ Plutella xylos- tella (Linnaeus) ] and their effects on feeding of the tested insects were studied. After Potter spraying treatment, the corrected mortality rate caused by the 2 insecticides in all treatments increased as time flew away. But the leaf protec- tion rate decreased especially in the treatments with avermectin at lower concentrations. After leaf-dipping treatment, both corrected mortality rate and leaf protection rate in all treatments increased as time went along. In 72 h treatment with avermectin, the corrected mortality rate was significantly lower than leaf protection rate, except in those treat- ments with the concentration of 10.00 mg/L or 0.31 mg/L, the two rates were similar. However, in the treatments with fipronil, the former was significantly higher than the later in all treatments, except those with the concentration of 12.50 mg/L, the two rates were also similar. The significance of leaf protection rate in toxicity assessment of insecti- cides was discussed.

关 键 词:小菜蛾[Plutella xylostella(Linnaeus)] 氟虫腈 阿维菌素 叶片保护率 校正死亡率 

分 类 号:S481.1[农业科学—农药学]

 

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