摘要
用几种药剂对棉红铃虫滞育幼虫和非滞育幼虫进行了室内毒力测定,结果表明,久效磷、敌百虫和氧化乐果对滞育初期幼虫的LD_(50)分别为146.5、716.8和489.3kg/g,比非滞育幼虫的毒力提高19.9、55.2和11.9倍。滞育初期幼虫的异质性也较大,上述三种药剂对其毒力回归线斜率(b值)分别是0.49、1.28和0.78,而对非滞育幼虫则为2.38、2.56和3.13。滞育幼虫的耐药力随滞育时间的增长而减弱,滞育后期幼虫对久效磷的耐药力仅为滞育初期幼虫的1/26.7和1/106.2,对敌百虫的耐药力为滞育初期幼虫的1/5.1和1/9.5。
The tolerance of diapause and nondiapause pink bollworm larvae to some insecticideswas tested. With diapause larvae at the early stage (within one month after collection), theLD_(50) values of monocrotophos, trichlorfon, and omethoate were 146.5, 716.8 and 489.3μg/g, respectively, indicating that the diapause larvae were 19.9-, 55.2-and 11.9-foldmore tolerant to the three insecticides, respectively than their non-diapause counterparts.Besides, they showed great heterogeneity. The slopes of LD-P lines of the above threechemicals were 0.49, 1.28 and 0.78 to the former larvae respectively, whereas 2.38, 2.56 and3.13 to the latter respectively. The tolerance of diapause larvae decreased with time prolonged. At middle (during2-4 months after collection) and late (4 months later after collection) stages, they became26.7 and 106.2-fold less tolerant to monocrotophos, respectively than the early-stagediapause larvae; and 5.1 and 9.5-fold less tolerant to trichlorfon, respectively.
出处
《山东农业大学学报（自然科学版）》
CSCD
1990年第1期27-30,共4页
Journal of Shandong Agricultural University：Natural Science Edition
关键词
棉红铃虫
滞育幼虫
耐药性
Ipink bollworm
diapause larvae
tolerance
