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CONTACT TOXICITY OF SOME PYRETHROID INSECTICIDES, ALONE AND IN COMBINATION WITH PIPERONYL BUTOXIDE, TO INSECTICIDE-SUSCEPTIBLE AND PYRETHROID-RESISTANT STRAINS OF THE COLORADO POTATO BEETLE (COLEOPTERA: CHRYSOMELIDAE)

Published online by Cambridge University Press:  31 May 2012

C.R. Harris  and
S.A. Turnbull
C.R. Harris
Affiliation:
Agriculture Canada Research Centre, University Sub Post Office, London, Ontario, Canada N6A 5B7
S.A. Turnbull
Affiliation:
Agriculture Canada Research Centre, University Sub Post Office, London, Ontario, Canada N6A 5B7
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Abstract

Laboratory tests showed that a Colorado potato beetle (CPB), Leptinotarsa decemlineata (Say) (Coleoptera: Chrysomelidae), strain collected from potatoes on a farm near Sherbrooke, Quebec, and known in 1979 to be resistant to most recommended organochlorine, organophosphorus, and carbamate insecticides, also had developed 23- to 38-fold levels of resistance to the pyrethroid insecticides permethrin, fenvalerate, and cypermethrin by 1982. Piperonyl butoxide (PB) had only a minor effect on fenvalerate and deltamethrin toxicity to insecticide-susceptible CPB and on deltamethrin toxicity to pyrethroid-resistant CPB. However, PB effectively synergized fenvalerate in pyrethroid-resistant CPB, e.g. a 1:8 fenvalerate:PB mixture was 12-fold more toxic than fenvalerate alone.

Résumé

Des tests de laboratoire ont montré qu’une lignée du doryphore de la pomme de terre, Leptinotarsa decemlineata (Say) (Coleoptera : Chrysomelidae), provenant d’une ferme de pomme de terre située près de Sherbrooke, Québec, et rapportée en 1979 comme étant résistante à la plupart des insecticides organochlorés, organophosphorés et carbamates recommandés, avait aussi développé en 1982 un facteur de résistance de 23 à 38 fois vis-à-vis des pyréthroïdes perméthrine, fenvalérate et cyperméthrine. Le butoxide de pipéronyle (BP) n’a montré qu’un effet mineur sur la toxicité du fenvalérate et de la deltaméthrine pour les doryphores susceptibles aux insecticides, et sur la toxicité de la deltaméthrine pour les doryphores résistants aux pyréthroïdes. Cependant le BP s’est avéré synergétique du fenvalérate chez les doryphores résistants aux pyréthroïdes; ainsi un mélange de 1 : 8 fenvalérate : BP était 12 fois plus toxique que le fenvalérate seul.

Type
Articles
Information
The Canadian Entomologist , Volume 118 , Issue 11 , November 1986 , pp. 1173 - 1176
Copyright
Copyright © Entomological Society of Canada 1986

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