Current issue: 53(1)

Impact factor 1.683
5-year impact factor 1.950
Silva Fennica 1926-1997
1990-1997
1980-1989
1970-1979
1960-1969
Acta Forestalia Fennica
1953-1968
1933-1952
1913-1932

Acta Forestalia Fennica no. 127 | 1973

Category: Article

article id 7561, category Article
Kalervo Salonen. (1973). Pystynävertäjän (Blastophagus piniperda L., Col., Scolytidae) elämänkierrosta, erityisesti sen lisääntymisbiologiasta. Acta Forestalia Fennica no. 127 article id 7561. https://doi.org/10.14214/aff.7561
English title: On the life cycle, especially on the reproduction biology of Blastophagus piniperda L. ( Col., Scolytidae).

Blastophagus piniperda L. (now Tomicus piniperda) life cycle, especially temperature effects at various stages, has been studied in laboratory, outdoor development experiments and in natural conditions in the field in Finland, 1961–1970.

It was established that when a tree with overwintering beetles in its base is felled during the winter, the overwintered insects can establish an egg gallery into the stump without leaving for swarming flight. The egg gallery can be established in this case already about a month before swarming starts. Swarming starts after temperature in the shade exceeds 10° C. It is at its maximum at a temperature over 12° C and in conditions of no wind. The swarming starts in Southern Finland generally in the latter half of April, and in Lapland two to four weeks later than in Southern Finland, and it lasts from a few days to a few weeks. As the temperature rises, the rate of egg gallery construction and the rate of egg laying increase. The characteristics of the galleries and pupal stage are described in detail.

In Finnish conditions, B. Piniperda does not have a diapause. Movement into overwintering sites starts after the minimum daily temperature goes below 0° C. About 10% of the insects found in the overwintering sites in spring were estimated to have died during the winter. With increasing density, the number of new beetles which developed from each egg gallery decreased.

The PDF includes a summary in Finnish.

  • Salonen, ORCID ID:E-mail:

Register
Click this link to register for Silva Fennica submission and tracking system.
Log in
If you are a registered user, log in to save your selected articles for later access.
Contents alert
Sign up to receive alerts of new content
Your selected articles

Committee on Publication Ethics A Trusted Community-Governed Archive