Abstract
The purpose of this paper is to suggest an explanation of the long-lasting and drastic growth rate reduction in stands of Scots pine, caused by a common pine shoot beetle attack. Based on an evaluation of nitrogen economy and canopy growth it is hypothesized that the growth reduction is primarily an effect of removal of needle biomass and secondarily an effect of decreased rate of nitrogen uptake. Consequences of this hypothesis are discussed and experiments aimed at testing it are suggested.
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