BtA天霸防治小菜蛾与菜青虫试验

Effective Tests on BtA Tianba against the Plutella xylostella L .and Pierisrapae L

1999年进行了BtA天霸防治小菜蛾和菜青虫的小区药效试验。结果表明 ,该药对上述二种害虫具有良好防治效果。药后 1、5天 ,80 0倍液对小菜蛾防治效果均超过 95 % ,显著高于 2 0 %杀灭菊酯 10 0 0倍 +4 0 %乐果 5 0 0倍液和BtA天霸 16 0 0倍液。 80 0、16 0 0倍液对菜青虫防治效果 ,药后 1天为 86 .90 %～ 97 6 9% ,药后 5天为 90 89%～ 10 0 % ,用 80 0倍液可同时防治小菜蛾和菜青虫 。

ThefieldtrialswithBtATianba ,mixtureofB .t.and abamectintocontrollingPlutellaxylostellaL .andPiericsrapaeL .were carriedoutin 1999.Theresultsshowedthatthepesticidewasveryef fectiveforcontrollingthesetwopests.ThecontroleffectforthePlutella xylostellaL .werereachedover 95 % 1and 5daysafterspraybyusing 80 0timesdiluents,andwerehigherthanthoseofthemixtureof 2 0 % detamethrinand 40 %omethoateorBtATianbabyusing 160 0times diluents.Thecontroleffectafter 1daysofspraybyusing 80 0～ 160 0 timesdiluentsforPrierisrapaeL .wereover85 % ,andover 90 %after 5 daysofspray .Thepesticidecancontrolthesetwopestssimultaneously byusing 80 0timesdiluent.Itisimportantfortheno -pollutionveg etableproduce .