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Titre :
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Structure of populations of Lygus hesperus (Hemiptera : Miridae) with multiple resistance mechanisms to trichlorfon
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Auteurs :
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Gang Xu ;
W. Brindley
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Type de document :
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article/chapitre/communication
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Année de publication :
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1993
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Format :
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vol. 86 no. 6 ; 1656-1663
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Langues:
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= Anglais
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Mots-clés:
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SENSIBILITE RESISTANCE
;
INSECTICIDE
;
ORGANOPHOSPHORE
;
POPULATION ANIMALE
;
STRUCTURE POPULATION
;
ACTIVITE ENZYMATIQUE
;
ACETYLCHOLINESTERASE
;
MORTALITE
;
DEPREDATEUR
;
TRICHLORFON
;
MEDICAGO SATIVA
;
LYGUS HESPERUS
;
CARBOXYLIC ESTER HYDROLASES
;
ESTERASES
;
HYDROLASES
;
ENZYME
;
LEGUMINOSAE
;
DICOTYLEDONES
;
ANGIOSPERMAE
;
SPERMATOPHYTA
;
PLANTE FOURRAGERE
;
MIRIDAE
;
HETEROPTERA
;
INSECTA
;
ARTHROPODA
;
INVERTEBRATA
;
Resistance aux traitements
;
Insecticide
;
Genetique des populations
;
Lygus hesperus
;
Miridae
;
Medicago sativa
;
Leguminosae
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Résumé :
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Five populations of Lygus hesperus Knight collected from alfalfa fields in Utah and Idaho were exposed to a range of concentrations of trichlorfon in a contact bioassay using plastic, self-closing bags. Various degrees of resistance were noticed. Esterase activity and acetylcholinesterase (AChE) insensitivity were assayed in 160 individuals from each population. Esterase activity of the most resistant population from Idaho was more than four times that of the susceptible Utah population, and AChE of the most resistant population was only one-third as sensitive to 10**(-7) M paraoxon. We detected a linear correlation between esterase activity and AChE insensitivity levels with the logarithm of the LC::(50)s
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Source :
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Journal of economic entomology
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