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Applying the IDS method to remove seeds infested with the seed chalcid, Megastigmus spermotrophus Wachtl, in Douglas-fir, Pseudotsuga menziesii (Mirb.) Franco. 1991. Sweeney, J.D.; El-Kassaby, Y.A.; Taylor, D.W.; Edwards, D.G.W.; Miller, G.E. New Forests 5(4): 327-334.