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Field Studies on Flight Patterns and Olfactory Responses of Ambrosia Beetles in Douglas-fir Forests of Western Oregon1

Published online by Cambridge University Press:  31 May 2012

J. A. Rudinsky  and
G. E. Daterman
J. A. Rudinsky
Affiliation:
Department of Entomology, Oregon State University, Corvallis
G. E. Daterman
Affiliation:
Department of Entomology, Oregon State University, Corvallis
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Abstract

The flight of the ambrosia beetles, Trypodendron lineatum (Oliv.), Gnathotrichus sulcatus Lec. and G. retusus Lec., revealed distinct diurnal and seasonal patterns that were influenced by environmental factors, particularly temperature, wind, and daylight. While Trypodendron flies during the entire day when the temperature is favorable, the Gnathotrichus species exhibit a peak of flight at dusk. The temperature thresholds of emergence and initiation of flight for Trypodendron and the threshold for flight of Gnathotrichus were established.

The substance responsible for mass attraction of Trypodendron, after the initial invasion of a few pioneer beetles, was found to be a species-specific sex pheromone produced by sexually mature females after entering the host. The pheromone has been concentrated from the female borings in the laboratory, and when released in the field it caused the beetles to respond. Both species of Gnathotrichus, on the other hand, responded to the borings produced by female beetles of Dendroctonus pseudotsugae Hopkins and to the extract prepared in alcohol. This fact suggests possible use of these substances in control of these ambrosia beetles.

Type
Articles
Information
The Canadian Entomologist , Volume 96 , Issue 10 , October 1964 , pp. 1339 - 1352
Copyright
Copyright © Entomological Society of Canada 1964

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