Journal of Economic Entomology (1997) 90, 21-26

R.G. Hollingsworth, D.C. Steinkraus and N.P. Tugwell (1997)
Responses of Arkansas populations of tarnished plant bugs (Heteroptera: Miridae) to insecticides, and tolerance differences between nymphs and adults
Journal of Economic Entomology 90 (1), 21-26
Abstract: Tarnished plant bugs, Lygus lineolaris (Palisot de Beauvois), collected from 4 sites in Arkansas were tested for susceptibility to 4 insecticides (lambda-cyhalothrin, dimethoate, endosulfan, and oxamyl). Adults were subjected to vial bioassays: At LC₅₀, 2 populations had higher tolerances to endosulfan than a susceptible reference; tolerance ratios (TR) were 33 and 36, respectively. These 2 populations were collected from cotton fields treated with multiple applications of insecticides in 1994. One of these populations also had significantly higher tolerance to oxamyl (tolerance ratio = 3.6) than the susceptible reference population. For all insecticides tested, LC₅₀s were lower for the 2 populations collected during summer from unsprayed areas compared with the 2 populations collected during summer from areas treated with insecticides in 1994. Insecticide tolerances in insects from spring collections were lower than tolerances in summer-collected insects, except for insects collected from an area of low insecticide use. These differences were significant for 3 of the 4 insecticides-lambda-cyhalothrin, endosulfan, and oxamyl-tested. In separate vial bioassays, we compared the insecticide tolerances of L. lineolaris nymphs and adults. At LC₅₀, nymphs were significantly more tolerant (2.4-3.8 X) to all 4 insecticides.
(The abstract is excluded from the Creative Commons licence and has been copied with permission by the publisher.)
Database assignments for author(s): Robert G. Hollingsworth, Donald C. Steinkraus

Research topic(s) for pests/diseases/weeds:
pesticide resistance of pest

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Pest and/or beneficial records:

Beneficial	Pest/Disease/Weed	Crop/Product	Country	Quarant.
	Lygus lineolaris	Cotton (Gossypium)	U.S.A. (mid S)