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Biology and outbreaks of Microdiprion pallipes (Hymenoptera; Diprionidae) in Sweden

Olofsson, Einar (1994). Biology and outbreaks of Microdiprion pallipes (Hymenoptera; Diprionidae) in Sweden. Technical Report. Uppsala: (NL, NJ) > Dept. of Entomology (until 061231), Sveriges lantbruksuniversitet. Studia forestalia Suecica ; 193

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During outbreaks, Microdiprion pallipes (Fall.) is the most destructive of the pine sawflies in Sweden. Its distribution includes most provinces, but damaging outbreaks have until recently occurred only in two inland areas in northern Sweden. These areas are characterised by high elevation, a harsh climate, and slow tree growth. The four recorded outbreak periods showed a 10 year periodicity. Outside these areas, a lesser outbreak occurred in 1988 to 1990, on the east coast (province of Uppland). Outbreak patterns, life history variation, and mortality factors were studied. Factors that may explain the distribution of outbreaks and the population patterns were identified. Experimental and observational evidence on the potential of various factors to influence fecundity, dispersal, and survival was evaluated. In the outbreak areas, there were few major population factors. Parasitism by Rhorus substitutor (Thunb.) was the largest cause of larval mortality and the only important density dependent mortality factor. The different diapause strategies of M. pallipes and R. substitutor may contribute to stabilise this system. Different flight periods of the host and the parasitoid may explain a possible correlation between weather and outbreaks. Elsewhere in Sweden, where low population densities prevail, there may be similarities in population processes between M. pallipes and the other widely distributed diprionids with solitary larvae, which never have attained outbreak densities in Sweden. Interactions with other diprionids through shared natural enemies may be an important population process and may influence the distribution of outbreaks.

Authors/Creators:Olofsson, Einar
Title:Biology and outbreaks of Microdiprion pallipes (Hymenoptera; Diprionidae) in Sweden
Series Name/Journal:Studia forestalia Suecica
Year of publishing :1994
Number of Pages:20
Place of Publication:Uppsala
Publisher:Faculty of Forestry, Swedish University of Agricultural Sciences
ISBN for printed version:91-576-4884-0
Publication Type:Report
Full Text Status:Public
Agris subject categories.:K Forestry > K01 Forestry - General aspects
Subjects:Obsolete subject words > NATURAL SCIENCES > Biology
Obsolete subject words > FORESTRY, AGRICULTURAL SCIENCES and LANDSCAPE PLANNING > Plant production > Forestry
(A) Swedish standard research categories 2011 > 1 Natural sciences > 106 Biological Sciences (Medical to be 3 and Agricultural to be 4) > Other Biological Topics
(A) Swedish standard research categories 2011 > 4 Agricultural Sciences > 401 Agricultural, Forestry and Fisheries > Forest Science
Keywords:distribution, life history, fecundity, mortality, damage, Pinus sylvestris, Pinus contorta
Permanent URL:
ID Code:3914
Faculty:NL - Faculty of Natural Resources and Agricultural Sciences (until 2013)
Department:(NL, NJ) > Dept. of Entomology (until 061231)
Deposited By: Skogsbiblioteket Umeå
Deposited On:10 Feb 2010 00:00
Metadata Last Modified:17 Dec 2015 13:13

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