Tolerance to cypermethrin and endosulfan in field populations of the bollworm (Lepidoptera: Noctuidae) from Texas

Responses to insecticides in bollworm, Helicoverpa zea (Boddie), males collected from 1988 to 1994 in sex-pheromone baited traps in the Brazos Valley near College Station, TX, varied during each season with tolerance being highest in midseason. Significant tolerance occurred with cypermethrin in 198...

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Bibliographic Details
Published in:Journal of economic entomology 1996-06, Vol.89 (3), p.583-589
Main Authors: Kanga, L.H.B. (University of Arizona, Tucson, AZ.), Plapp, F.W. Jr, McCutchen, B.F, Bagwell, R.D, Lopez, J.D. Jr
Format: Article
Language:English
Subjects:
Biological and medical sciences
BUTOXIDO DE PIPERONIL
BUTOXYDE DE PIPERONYLE
Chemical control
CIPERMETRIN
Control
CONTROLE CONTINU
CYPERMETHRINE
ENDOSULFAN
Fundamental and applied biological sciences. Psychology
HELICOVERPA ZEA
Lepidoptera
METHOMYL
METOMILO
MORTALIDAD
MORTALITE
Noctuidae
Phytopathology. Animal pests. Plant and forest protection
PROFENOFOS
Protozoa. Invertebrates
SUPERVIVENCIA
SURVIE
TEXAS
TOXICIDAD
TOXICITE
VARIACION ESTACIONAL
VARIATION SAISONNIERE
VIGILANCIA
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Summary:Responses to insecticides in bollworm, Helicoverpa zea (Boddie), males collected from 1988 to 1994 in sex-pheromone baited traps in the Brazos Valley near College Station, TX, varied during each season with tolerance being highest in midseason. Significant tolerance occurred with cypermethrin in 1988 and 1989, and with endosulfan in 1994. Tests in 1994 with profenofos or methomyl showed no significant tolerance to these insecticides. We found significant variations between trap sites in responses of field bollworms to cypermethrin, suggesting that increased tolerance may be a localized phenomenon. Tests with cypermethrin plus piperonyl butoxide indicated significant synergism in bollworms collected from the field, suggesting that enhanced metabolic degradation may be a factor in pyrethroid tolerance in this species. Diagnostic concentrations for monitoring tolerance in field-collected bollworm males were determined for all insecticides tested. The results reported here validate use of the adult vial test to monitor for tolerance to insecticides in the bollworm, and provide information useful for the development of a resistance management strategy intended to extend the efficacy of insecticides used to control the bollworm
ISSN:0022-0493
1938-291X
DOI:10.1093/jee/89.3.583