固氮作物紫云英苜蓿叶象甲药剂筛选试验初探

为有效防治危害紫云英的苜蓿叶象甲,笔者测定了5种杀虫剂对叶象甲的田间防治效果。结果表明,每667 m²喷施10%联苯菊酯乳油30 mL防治苜蓿叶象甲幼虫,速效性和持效性优异,药后7 d和14 d的平均防效分别为92.2%和98.2%;喷施60 g/L乙基多杀菌素悬浮剂30 mL和4.5%高效氯氰菊酯乳油30 mL的防效次之,药后14 d平均防效分别为86.5%和69.8%;喷施10%虫螨腈悬浮剂50 mL防治苜蓿叶象甲速效性好,药后7 d平均防效为62.4%;喷施5.7%甲维盐水分散粒剂10 g持效性好,药后14 d平均防效为83.4%。

Preliminary Screening Test on Hypera postica of Nitrogen Fixing Crop Astragalus sinicus L.

Hypera postica is a kind of pest that harms Chinese milk vetch.For contolling of Hypera postica that harms milk vetch,we determined field control effects of 5 insecticides in Hypera postica.The results clearly showed that 10%bifenthrin EC 30 mL per 667 m² could control larva of Hypera postica,and the contol effect was quick and lasting.The average control effect was 92.2%and 98.2%for 7 d and 14 d after spray,respectively.The effects of 60 g/L spinetoram SC 30 mL and 4.5%beta-cypermethrin EC 30 mL were next to 10%bifenthrin EC 30 mL.The average control effect was 86.5%and 69.8%for 14 d after spray,respectively.The effcet of 4.5%chlorfenapyr SC 50 mL was quick.The average control effect was 62.4%for 7 d after spray,and the effect of 5.7%emamectin benzoate WG 10 g was lasting,which the average control effect was 83.4%for 14 d after spray.