阿维菌B_2对四种节肢动物的毒力活性和田间防治效果

TOXITITY OF AVERMECTIN B_2 TO FOUR ARTHROPODS AND ITS CONTROL EFFECTS ON Plutella xylostella AND Galerucella grisescens IN FIELDS

实验室生物测定比较了阿维菌素Ｂ２和Ｂ１对四种节肢动物的毒力活性。Ｂ２对小菜蛾、褐背小萤叶甲和大水蚤的毒力活性均高于Ｂ１，４８ｈ Ｌｃ５０值（Ｂ２／Ｂ１）分别为０．８０／１．３２μｇ／ｍＬ，０．０６３／０．０８９μｇ／ｍＬ和０．０００２１／０．０００４９μｇ／ｍＬ。对二点叶螨的 ２４ｈ毒力，Ｂ１（０．００８２ μｇ／ｍＬ）略高于Ｂ２（０．００９４μｇ／ｍＬ）。以Ｂ２乳油剂有效成分７．５—１５．０ｇ／ｈｍ２田间防治小菜蛾，或 ３．７５～７．５０ｇ／ｈｍ２防治褐背小萤叶甲均可取得极佳防治效果。

Toxicities of Avermectins B2 and B1 (AVM) to four arthorpods were comparatively studied in laboratory and field.The values of Lc50(μg/mL) of AVM B2/B1 for plutella xylostella(48h), Galerucella grisescens(48h),Daphinia magna(48h) and Tatranychus urticae(24h) are 0. 80/1. 32,0. 063/0. 089,0. 00021/0. 00X49 and 0. 0094/0.0082 tespectively. Results of field test demonstrated that the excellent efficacy could be obtained when the AVM B2 emulsion was applied at 7.5-15.0g(a.i.)/hm2 for controlling P. xylostella on cabbage and at 3.75-7.50g(ai)hm2 for controlling G. grisescens on garden sorrel(Rumex acetosa).