Entomologia Generalis (1996) 21, 37-54
M. Coeln, Y. Niu and E. Führer (1996)
Entwicklung von Fichtenborkenkäfern in Abhängigkeit von thermischen Bedingungen verschiedener montaner Waldstufen (Coleoptera: Scolytidae)
[Temperature-related development of spruce bark beetles in montane forest formations (Coleoptera: Scolytidae)]
Entomologia Generalis 21 (1/2), 37-54
Abstract: Two slope profiles covering altitudes from 620 - 1,420 mNN and exposed to N and S, respectively, were investigated during 2 seasons for their thermal conditions regarding the development of spruce bark beetle populations. Temperature of air and cambium in different positions on trap trees were recorded continously, in order to calculate the thermal sums available for the broods under different site and weather conditions. Moreover, flight activity and brood development was observed. In the laboratory the developmental zero and the required thermal sum of Ips typographus (Linnaeus 1758), Ips amitinus (Eichhoff 1871) and Pityogenes chalcographus (Linnaeus 1761) were experimentally determined. Significant differences between the 3 species were found. Since the data from laboratory proved to be valid also in the field, they can be used for calculating the developmental potential of these Scolytidae species under different, thermal conditions. The latter differed considerably due to altitude, exposition, shadowing and weather, thus providing a wide range of different thermal sums available to the broods. Taking into account that Ips typographus cannot hibernate in a subadult stage, the effective period of reproduction during season varies between a few weeks in spring and a few months in summer. The implications for population dynamics of Ips typographus and Pityogenes chalcographus are briefly discussed, considering a diapause of adults with Ips typographus and the differences between specific modes of hibernation.
(The abstract is excluded from the Creative Commons licence and has been copied with permission by the publisher.)
(original language: German)
Research topic(s) for pests/diseases/weeds:
general biology - morphology - evolution
environment - cropping system/rotation
Pest and/or beneficial records:
| Beneficial | Pest/Disease/Weed | Crop/Product | Country | Quarant.
|
|---|---|---|---|---|
| Ips typographus | Spruce (Picea) | Austria | ||
| Pityogenes chalcographus | Austria | |||
| Ips amitinus | Austria |
