INSECTICIDE RESISTANCE IN FIELD POPULATIONS OF THE COTTON APHID (HOMOPTERA, APHIDIDAE)

被引:78
作者
KERNS, DL
GAYLOR, MJ
机构
[1] AUBURN UNIV, ALABAMA AGR EXPT STN, AUBURN, AL 36849 USA
[2] AUBURN UNIV, DEPT ENTOMOL, AUBURN, AL 36849 USA
关键词
INSECTA; APHIDS; COTTON APHID; INSECTICIDE RESISTANCE;
D O I
10.1093/jee/85.1.1
中图分类号
Q96 [昆虫学];
学科分类号
摘要
Cotton aphids, Aphis gossypii Glover, were collected for 3 yr from cotton fields in Alabama and Texas, and screened for resistance to four pyrethroid and eight organophosphate insecticides. Resistance ratios were based on comparisons of the LC50s of field populations with the LC50s of a susceptible laboratory population. During 1988, resistance to the pyrethroids bifenthrin and cypermethrin was low (< 20-fold) to moderate (20- to 50-fold). Resistance to the organophosphates ranged from 1- to 85-fold, and was highest to methamidophos. During 1988, resistance to several insecticides increased rapidly within fields soon after insecticide applications. Resistance during 1989 was low or not detectable; the highest resistance was to phosphamidon (almost-equal-to 6-fold). During 1990, resistance was widespread but generally occurred at low levels. Resistance ratios and slopes of the probit regressions were variable among years within insecticides, and resistance was not always consistent among insecticides within an insecticide class, even when aphid populations were collected within the same general areas. Multiple mechanisms of resistance may be involved, and we conclude that resistance has developed on a relatively small scale.
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页码:1 / 8
页数:8
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