Establishment of a new brood in Tomicus piniperda (L.) (Col., Scolytidae) after a second hibernation
1989
Schroeder, L. M. | Risberg, B.
Survival and reproduction of the pine shoot beetle Tomicus piniperda (L.) was studied in field and laboratory experiments in Sweden with the aim of ascertaining whether the adults can hibernate twice and if they can reproduce after the second hibernation. After leaving the breeding material in summer, parent beetles as well as new‐generation adults were caged in crowns of healthy Scots pine trees. The number of beetles surviving the period of shoot feeding was recorded. These beetles were then placed in hibernation in a freezer while other groups of adults were allowed to hibernate in the field. After hibernation, all beetle groups were supplied with breeding material. During the shoot feeding period the parent beetles suffered 12% mortality and the new generation beetles 23% mortality. Hibernation in laboratory resulted in 30% mortality in both beetle generations. About the same proportion, approximately 40%, of the parent and new‐generation beetles released on pine trees the first year reproduced during the second year. The number of adults produced per egg gallery was of the same magnitude for the two beetle generations.
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