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PETROVA ALBICAPITANA (BUSCK) AND P. METALLICA (BUSCK) (LEPIDOPTERA: TORTRICIDAE) IN PINUS CONTORTA DOUGL. STANDS OF ALBERTA

Published online by Cambridge University Press:  31 May 2012

H.R. Wong ,
J.A. Drouin  and
C.L. Rentz
H.R. Wong
Affiliation:
Northem Forest Research Centre, Canadian Forestry Service, 5320 - 122 Street, Edmonton, Alberta, Canada T6H 3S5
J.A. Drouin
Affiliation:
Northem Forest Research Centre, Canadian Forestry Service, 5320 - 122 Street, Edmonton, Alberta, Canada T6H 3S5
C.L. Rentz
Affiliation:
Northem Forest Research Centre, Canadian Forestry Service, 5320 - 122 Street, Edmonton, Alberta, Canada T6H 3S5
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Abstract

Both Petrova albicapitana (Busck) and P. metallica (Busck) attack Pinus contorta Dougl. in Alberta. The similarity of their larvae and of the pitch-blister nodules that they construct make it difficult to identify the 2 species in the field; however, they can be separated on the basis of their feeding damage. The abundance of males caught in pheromone traps indicates that P. metallica was more common than P. albicapitana in 1981–1984, and more widely distributed than previously recorded in Alberta. The examination of the feeding damage and the pheromone trapping of males indicate P. metallica occur only in stands of P. contorta in Alberta. Petrova albicapitana, however, was collected in stands of P. contorta, P. banksiana Lamb., and a mixture of P. contorta and P. banksiana. The 2 species differed in seasonal occurrence and abundance at different elevations.

Résumé

En Alberta, Petrova albicapitana (Busck) et P. metallica (Busck) s'attaquent tous deux à Pinus contorta Dougl. Il est difficile de distinguer sur le terrain les 2 espèces parce que leurs larves se ressemblent ainsi que leurs nodules résineux, mais les ravages qu'elles causent permettent de les différencier. La grande quantité de mâles pris au piège à l'aide de phéromones montre que P. metallica était plus commun que P. albicapitana de 1981 à 1984 et qu'il était plus répandu que ne l'indiquaient les relevés antérieurs en Alberta. D'après l'examen des ravages et des pièges à phéromones, P. metallica ne s'attaque qu'aux peuplements de P. contorta dans la province. Toutefois, on a trouvé P. albicapitana dans des peuplements de P. contorta, de P. banksiana Lamb, et dans des peuplements mixtes de P. contorta et de P. banksiana. Les 2 espèces n'apparaissent pas à la même saison, et leur abondance est fonction de l'altitude.

Type
Articles
Information
The Canadian Entomologist , Volume 117 , Issue 12 , December 1985 , pp. 1463 - 1470
Copyright
Copyright © Entomological Society of Canada 1985

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