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- Title
Seasonal difference in the abundance of the spruce beetle (Ips typographus japonicus Niijima) (Col., Scolytidae) within and outside forest in a bivoltine area.
- Authors
Furuta, K.; Iguchi, K.; Lawson, S.
- Abstract
In Hokkaido (Japan), the spruce beetle ( Ips typograpaus japonicus) kills standing spruce trees after selection cutting. The seasonal change in the number of beetles captured in 18-21 traps within or outside forest was analysed, with reference to a control strategy for this species in a bivoltine area. The number of beetles captured in traps had two peaks: one, which was small, in early June, and the other, which was a large peak, in July. However, the number of beetles captured in traps outside the forest had only one small peak, in June. The difference between the inside and outside of the forest was caused by the difference in the number of newly emerged beetles captured in traps. Beetles were distributed contagiously within the forest and there was no remarkable change in distribution pattern throughout seasons. Beetles were distributed at random in June when beetle activity was high outside forest. Overwintered beetles must undertake long-range dispersal irrespective of whether they are within or outside of forest for finding suitable breeding materials. Nevertheless, the most important point is that newly emerged beetles stayed inside the forest and only a few individuals dispersed outside the forest. This study recommends that different control methods are adopted according to the seasons for the control of spruce beetles.
- Subjects
HOKKAIDO (Japan); JAPAN; SPRUCE beetle; INSECT trapping; IPS typographus; FORESTS &; forestry; INSECT pest control; SEASONS; DISPERSAL of insects
- Publication
Journal of Applied Entomology, 1996, Vol 120, Issue 1-5, p125
- ISSN
0931-2048
- Publication type
Article
- DOI
10.1111/j.1439-0418.1996.tb01578.x