Increased susceptibility of pyrethroid-resistant tobacco budworm (Lepidoptera: Noctuidae) to chlorfenapyr

Chlorfenapyr is a new pyrrole insecticide with a new mode of action. Its toxicity to adult Heliothis virescens (F.) is negatively correlated with cypermethrin toxicity by the equation y = -1.065x + 3.513 (r = 0.97), where x = log LC50 cypermethrin, y = log LC50 chlorfenapyr. Chlorfenapyr was most to...

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Bibliographic Details
Published in:Journal of economic entomology 1997-02, Vol.90 (1), p.49-54
Main Authors: Pimprale, S.S. (Clemson University, Clemson, SC.), Besco, C.L, Bryson, P.K, Brown, T.M
Format: Article
Language:English
Subjects:
Biological and medical sciences
Chemical control
CIPERMETRIN
Control
CONTROL DE INSECTOS
CYPERMETHRINE
DIETA
Fundamental and applied biological sciences. Psychology
GENETICA
GENETIQUE
HELIOTHIS VIRESCENS
HEREDITE
HERENCIA GENETICA
INSECTICIDAS
INSECTICIDE
LUTTE ANTIINSECTE
Noctuidae
Phytopathology. Animal pests. Plant and forest protection
PIRETRINAS SINTETICAS
Protozoa. Invertebrates
PYRETHRINE DE SYNTHESE
REGIME ALIMENTAIRE
RESISTANCE AUX MALADIES
RESISTANCE AUX PRODUITS CHIMIQUES
RESISTENCIA A LA ENFERMEDAD
RESISTENCIA A PRODUCTOS QUIMICOS
RETROCROISEMENT
RETROCRUZAMIENTO
TOXICIDAD
TOXICITE
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Summary:Chlorfenapyr is a new pyrrole insecticide with a new mode of action. Its toxicity to adult Heliothis virescens (F.) is negatively correlated with cypermethrin toxicity by the equation y = -1.065x + 3.513 (r = 0.97), where x = log LC50 cypermethrin, y = log LC50 chlorfenapyr. Chlorfenapyr was most toxic to adults of a pyrethroid-resistant strain (LC50 = 70.1 micrograms per vial in adult vial tests at 48 h). The negative correlation was not observed in neonates fed with chlorfenapyr impregnated diet. Cross-resistance to chlorfenapyr in Pyrethroid-R larvae was 2.3-fold with the diet method, compared with 28-fold resistance to cypermethrin. Cross-resistance was only significant in diet tests. Chlorfenapyr was as effective as insecticides registered for cotton against H. virescens. Inheritance data showed that only 1 allele is necessary from the Pyrethroid-R strain to produce complete susceptibility to chlorfenapyr in adults. The susceptibility to chlorfenapyr is a dominant trait, and the resistance to chlorfenapyr is a recessive trait. In a backcross experiment, one-half the progeny were highly susceptible to chlorfenapyr and one-half were highly resistant, indicating segregation of a single factor. The mechanism for this effect could be caused by pleiotropy (i.e., a gene for pyrethroid resistance controls increased detoxication to cypermethrin while also increasing the susceptibility of chlorfenapyr). The pyrethroid-resistant gene is likely to be identical to, or closely linked to, the gene that gives increased susceptibility to chlorfenapyr
ISSN:0022-0493
1938-291X
DOI:10.1093/jee/90.1.49