Gallery construction and oviposition of the bark beetle Ips typographus (Coleoptera: Scolytidae) at different breeding densities

摘要: Abstract. 1. The bole of a Norway spruce, Picea abies(L.) Karst., was cut in 25 cm sections and infested the laboratory with 2 or 8 females/dm2 Ips typographus (L.) an equal number males. 2. One log each beetle density dissected every second day, beginning days after female introduction. 3. oviposition rate highest at breeding period for both densities then declined, especially high density. Residence time is useful approximation laid eggs when low. 4. Final gallery length egg per were on average significantly smaller than 5. Linear relationships between total niches found to be similar two densities. 6. An estimate adult mortality different by using data from field study that related attacked living trees, together published emergence new adults. 7. It concluded decreased earlier re‐emergence higher contribute declining increasing final offspring production futher reduced lower survival due larval competition as increases. (Less)