摘要
在室内测定了抗生素杀虫剂菜喜和集琦虫螨克对小菜蛾卵及幼虫生长发育、成虫存活及生殖的影响。结果表明 ,这两种药剂对小菜蛾卵的孵化率没有影响 ,但能大大降低初孵幼虫的存活率。对幼虫的生物活性 ,均随虫龄的增加而下降 ,且集琦虫螨克的活性远比菜喜高。菜喜对小菜蛾 4龄幼虫化蛹率有显著降低作用 ,但对蛹的羽化率、雌成虫寿命及产卵量却没有明显影响 ;而集琦虫螨克则对 4龄幼虫的化蛹率、蛹羽化率及羽化后成虫的产卵量均有显著的降低作用。用菜喜和集琦虫螨克的田间推荐浓度药液饲喂小菜蛾成虫 ,均能显著减少雌成虫的产卵量 。
The effects of two antibiotic insecticides, spinosad and avermectin, on the development and fecundity of Plutella xylostella , were studied in the laboratory. The results showed that both spinosad and avermectin did not affect egg hatching,but caused substantial mortality of newly hatched larvae. The larvicidal activity of avermectin was significantly higher than that of spinosad, and both decreased with increase of the larval age. Spinosad fed to 4th instar larvae for 2 h led to reduction in the percentage of pupation, but did not significantly affect adult emergence, life span, and egg production.However, avermectin fed by 4th instar larvae could remarkably reduce the percentage of pupation and adult emergence, and egg production. When adults were fed with these pesticides at concentrations recommended for field application, their egg production was significantly reduced, but life span of both female and male moths was not obviously affected.
出处
《浙江农业学报》
CSCD
2001年第3期152-156,共5页
Acta Agriculturae Zhejiangensis
基金
澳大利亚国际农业研究中心资助项目! (ACIARCS2 /1998/0 89)
浙江省重大科技计划项目! (0 0 110 6 12 4)
