The Canadian Entomologist

Articles

INCIDENCE OF INSECTICIDE RESISTANCE IN POPULATIONS OF COLORADO POTATO BEETLE, LEPTINOTARSA DECEMLINEATA (SAY) (COLEOPTERA: CHRYSOMELIDAE), ON PRINCE EDWARD ISLAND

Jeff G. Stewarta1, George G. Kennedya2 and Antony V. Sturza3

a1 Agriculture and Agri-Food Canada, Research Centre, PO Box 1210, Charlottetown, Prince Edward Island, Canada C1A 7M8

a2 Department of Entomology, North Carolina State University, Box 7630, Raleigh, North Carolina,USA 27695-7630

a3 P.E.I. Department of Agriculture and Forestry, PO Box 1600, Charlottetown, Prince Edward Island, Canada C1A 7N3

Abstract

A survey of 65 populations of Colorado potato beetle, Leptinotarsa decemlineata (Say), from locations across Prince Edward Island in 1993 indicated that insecticide resistance was widespread, but was most prevalent in the western and central potato-producing areas. Of the populations surveyed, 31, 26, 19, and 4% were classified as resistant to permethrin, carbofuran, azinphos-methyl, and endosulfan, respectively. Of 53 populations surveyed for resistance to these four insecticides, 13, six, four, and one of the populations were classified as resistant to one, two, three, and four insecticides, respectively.

Résumé

Les résultats de l’inventaire de 65 populations de Doryphores de la pomme de terre, Leptinotarsa decemlineata (Say), en diverses localités dispersées de l’Île-du-Prince-Édouard, en 1993, indiquent que la résistance aux insecticides est répandue, mais prévaut surtout dans les régions productrices de pommes de terre de l’ouest et du centre. Parmi les populations inventoriées, 31% sont résistantes à la perméthrine, 26% au carbofurane, 19% au méthyl-azynphos et 4% à l’endosulfane. Chez 53 des populations testées, 13 sont résistantes à un des insecticides, six à deux, quatre à trois, et une population est résistante aux quatre insecticides.

[Traduit par la Rédaction]

(Received September 08 1994)

(Accepted March 07 1996)