5%甲拌磷对油菜苗期害虫的防治效果

5%甲拌磷颗粒剂随种条播法防治油菜苗期主要害虫,小区试验,按照活性成分0.75～1.5kg/ha剂量于油菜春播期一次性施入播种沟内,对全体越冬成虫的平均防效,跳(虫甲)类为68.1%,黄曲条跳(虫甲)Phyllotreta vittata(Fabr.)]为66.7%、油菜茎龟象为63.7%。大田应用以活性成分0.75kg/ha为宜。

CONTROL EFFECTS OF 5% PHORATE SOME PESTS DAMAGING SEEDLING OF RAPE

The effects of the measure of row application of phorate 5G with seeds at sowing on some seedling beetle pests,such as Phy(lctrela nittata(Fabr.),P. hunailis Weise,Psylliodes spp. and Ceuthorrhynchus sp., were studied in the experimental plots of Oro rape (Brassica napus L.).Applied in doses from 0.75 to 1.5kg (active ingredient)/ha in seed furrow once in sowing time,and in terms of average control effects on the whole overwintered adult populations of these pests in 3 months, the measure showed 68.1% on all flea beetles,66.7% on the dominant species, P. inttata,and 63.7% on Ceutharrhyrcchus sp. The dose of 0.75kg (AI)/ha was available in fields. After application,the measure depressed these pests and protected seedlings well. As a result, plants grew and put on their fresh weight rapidly, the yield of rape seeds increased significantly,and the economical benefits reached a high level.