马尾松微红梢斑螟的防治药剂筛选

Screening pesticides for Dioryctria rubella control on Pinus massoniana

继2008年南方重大冰冻灾害后,微红梢斑螟在湖南省马尾松人工林大面积暴发。应用4种不同类型农药林间喷雾防治微红梢斑螟幼虫,其中以2.2%甲维盐EC 1 500 mL/hm2用量防效最佳,施药第3天和第10天,防效分别为81.96%和84.60%;其次为30%氯胺磷EC 600 mL/hm2用量,施药第3天和10天,防效分别为67.95%和79.14%;而5%氟虫腈EC和10%吡虫啉WP防效较差。另外,4种药剂施药后均对马尾松生长安全,对非靶标昆虫无明显影响,且环境友好。

After the big freeze damage occurred in the southern regions of China in 2008,Dioryctria rubella broke out in large areas of Hunan Province.The effectiveness of four insecticides sprayed in the Pinus massoniana forest on controlling D.rubella was evaluated.The results showed that 2.2% microemulsion of emamectin benzoate EC（1 500 mL/hm2） was the best on controlling D.rubella,by which the control effectiveness was 81.96% and 84.60% in 3 days and 10 days after application respectively,and the 30% chloramine phosphorus emulsifiable concentrate EC（600 mL/hm2）was also good for the control of D.rubella,by which the effectiveness was 67.95% and 79.14% in 3 days and 10 days after application respectively.But 5% fipronil EC and 10% imidacloprid WP had less effectiveness on the control of D.rubella.All four pesticides did not affect P.massoniana growth and were friendly to environment,and there had no any occurrence of other insect population abnormality after pesticide application.