Silva Fennica : quarterly issues : 30(2–3) : sa3023179.htm

Päivi Lyytikäinen, Pirjo Kainulainen, Anne Nerg, Seppo Neuvonen, Tarmo Virtanen & Jarmo K. Holopainen. 1996.

Performance of pine sawflies under elevated tropospheric ozone

Silva Fennica 30(2–3): 179–184

Concentration of the phytotoxic air pollutant, ozone (O3) is continually increasing in the lower layer of the troposphere. The purpose of this study was to compare performance of pine sawflies on Scots pine seedlings in ambient and future levels of ozone. Scots pine seedlings were grown in field fumigation system where the ozone doses in fumigated plots were 1.5–1.6 times the ambient level. Larvae of the European pine sawfly (Neodiprion sertifer) and Gilpinia pallida were reared on the foliage of Scots pine. The levels of resin acids and monoterpenes in foliage were analysed. There were no significant effects of ozone fumigation on sawfly performance or levels of defence compounds in pine foliage. The results suggest that the elevated ozone concentrations do not strongly affect the needle quality of young Scots pine and the importance of these two diprionid sawfly species as forest pests.

Keywords
air pollution, Neodiprion sertifer, Gilpina pallida, Scots pine, resin acids

Addresses
Lyytikäinen, U.S. Forest Service, Northeastern Center for Forest Health Research, 51 Mill Pond Road, Hamden, CT 06514, USA; Kainulainen, Nerg and Holopainen, Department of Ecology and Environmental Science, University of Kuopio, PO Box 1627, FIN-70211 Kuopio, Finland; Neuvonen and Virtanen, Kevo Subarctic Research Institute, University of Turku A777 Kevo, FIN-99800 Ivalo, Finland. Fax (Holopainen) +358 17 163 230, E-mail holopain@messi.uku.fi

Received 22 September 1995 Accepted 12 June 1996
ISSN 0037-5330

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