【摘要】 室内、田间试验表明,菜地用Bt乳剂防治菜青虫、小菜蛾、爪蛸螟等食叶害虫,天敌数量比化防区增长13.2倍;棉田用Bt乳剂防治二代棉铃虫,药后10天的天敌数量比敌杀死施药区增长11.3—16倍,保持下来的天敌有瓢虫、草蛉等,对蚜虫有控制作用,蚜害减轻,省去治蚜用药,呈现了良好的生态效益。更多还原

【Abstract】 Laboratory and field tests showed that Bt emulsifiable suspension was safe to nature enemy. On the vegetabls field treated with Bt for control of cabbage looper, diamond backmoth and pickle worm, the population of nature enemy was 13.2 times as much as that on the field treated by chemicals. Similar result was got on cotton field, and nature ensmy on Bt area, was 11.3 to 16 times as much as that on chemicals area ten days after spraying. The survived nature enemy could suppress the population of aphid.It showed a good ecological benifit by using Bt.更多还原