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HYLURGOPINUS RUFIPES (EICHHOFF) (COLEOPTERA: SCOLYTIDAE): ATTRACTION TO BROODWOOD, HOST COLONIZATION BEHAVIOR, AND SEASONAL ACTIVITY IN CENTRAL MINNESOTA

Published online by Cambridge University Press:  31 May 2012

Paul D. Swedenborg
Affiliation:
Department of Entomology, University of Minnesota, St. Paul, Minnesota, USA55108
Richard L. Jones
Affiliation:
Department of Entomology, University of Minnesota, St. Paul, Minnesota, USA55108
Mark E. Ascerno
Affiliation:
Department of Entomology, University of Minnesota, St. Paul, Minnesota, USA55108
Val R. Landwehr
Affiliation:
Department of Entomology, University of Minnesota, St. Paul, Minnesota, USA55108

Abstract

Field tests, using bolts of American elm trees either uninfested or infested with laboratory-reared or feral Hylurgopinus rufipes (Eichhoff), the native elm bark beetle, were conducted to evaluate colonization behavior of the beetle. The data confirm that (1) colonization of elm by H. rufipes can be accounted for by host attractants alone; (2) overwintered adult H. rufipes are attracted to broodwood (moribund or recently cut elm) in the spring, but summer-emergent adults are attracted to healthy elm; and (3) H. rufipes attacks broodwood primarily during evening beetle flights, and females initiate the gallery. A beetle-produced sex pheromone may be involved in the male–female pairing on broodwood.

Résumé

On a effectué des tests de terrain avec des billes d’orme américain saines ou infestés de scolyte de l’orme, Hylurgopinus rufipes (Eichhoff) sauvage ou provenant du laboratoire, afin d’étudier le comportement de colonisation du bois par le scolyte. Les données confirment que : (1) la colonisation de l’orme par H. rufipes est explicable par la seule intervention d’attractants de l’hôte; (2) les adultes sortant d’hivernement au printemps sont attirés par le bois de ponte (orme moribond ou récemment abattu), alors que les adultes émergeant au cours de l’été sont attirés par l’orme sain; et (3) H. rufipes attaque le bois surtout lors de vols ayant lieu en soirée, et ce sont les femelles qui initient le construction des galeries. Une phéromone sexuelle serait impliquée lors de l’accouplement dans le bois de ponte.

Type
Articles
Copyright
Copyright © Entomological Society of Canada 1988

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