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VULNERABILITY OF THE FIR CONEWORM, DIORYCTRIAABIETIVORELLA (GROTE) (LEPIDOPTERA: PYRALIDAE), IN DIFFERENT LARVAL STAGES TO THE HD-1 STRAIN OF BACILLUS THURINGIENSIS

Published online by Cambridge University Press:  31 May 2012

Richard Trudel ,
Éric Bauce ,
Jean Cabana  and
Claude Guertin
Richard Trudel
Affiliation:
Centre de Recherche en Biologie Forestière, Département de Foresterie, Université Laval, Sainte-Foy, Québec, Canada G1K 7P4
Éric Bauce
Affiliation:
Centre de Recherche en Biologie Forestière, Département de Foresterie, Université Laval, Sainte-Foy, Québec, Canada G1K 7P4
Jean Cabana
Affiliation:
Centre de Recherche en Biologie Forestière, Département de Foresterie, Université Laval, Sainte-Foy, Québec, Canada G1K 7P4
Claude Guertin
Affiliation:
Centre de Recherche en Biologie Forestière, Département de Foresterie, Université Laval, Sainte-Foy, Québec, Canada G1K 7P4
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Extract

The fir coneworm, Dioryctria abietivorella (Grote), is a major insect pest in seed orchards across Canada and the adjoining eastern and western United States. Larvae feed principally on cones, but they can also feed on needles and occasionally on the bark of young tree trunks (Hedlin et al. 1980; Ruth 1980; Martineau 1985). The potential for a population of D. abietivorella to build up in seed orchards may be greater than in natural stands (Hedlin et al. 1980; Ruth et al. 1982). The use of entomopathogen in the management of fir coneworm could be an adequate measure to reduce the impact of this insect. Moreover, Bacillus thuringiensis ssp. kurstaki has a specific effect on Lepidoptera (Aronson et al. 1986; Gill et al. 1992). The purpose of our study was to determine the activity of the HD-1 strain of B. thuringiensis ssp. kurstaki (serotype H-3a:3b) to larvae D. abietivorella. Bioassays were conducted with first-, third-, and fifth-instar larvae of fir coneworm to determine whether or not the insect's vulnerability to B. thuringiensis varies with larval age.

Type
Note
Information
The Canadian Entomologist , Volume 129 , Issue 1 , February 1997 , pp. 197 - 198
Copyright
Copyright © Entomological Society of Canada 1997

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