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Forestry 1994 67(4):329-341; doi:10.1093/forestry/67.4.329
© 1994 by Institute of Chartered Foresters
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The Interaction of Green Spruce Aphid and Fertilizer Applications on the Growth of Sitka Spruce

R. C. THOMAS* and H. G MILLER

Department of Forestry University of Aberdeen Aberdeen AB9 2UD, Scotland

* Present address (for correspondence): 33 Cairnwood, Heads Nook, Carlisle, Cumbria CA4 9AH, England

In an 11-year-old stand of Sitka spruce (Picea sitchensis [Bong.] Carr.) application of nitrogen fertilizers, at a rate of 10 kgN ha–1 month–1, increased mean diameter increment by 12 per cent, while the further addition of phosphorus, at 5 kg ha–1 month–1, resulted in a 23 per cent increase. An attack by the green spruce aphid (Elatobium albietinum Walker) occurred during the period of fertilizer addition. The most severely affected trees showed a reduction in diameter growth of 50 to 56 per cent but the severity of the attack between trees was unrelated to the treatments applied. However, fertilizer application did hasten the recovery of diameter growth after defoliation.


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