Field performance of Douglas-fir seedlings after treatment with fungicides

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Abstract
Douglas-fir (Pseudotsugamenziesii (Mirb.) Franco) seedlings grown in containers with pasteurized or nonpasteurized potting mixture and treated with benomyl, captan, fenaminosulf, or ethazol, or left untreated were outplanted in the Cascade Range of western Oregon. The seedlings from all treatments appeared to have been in similar condition at time of planting, so neither nursery managers nor silviculturists would have suspected effects of the treatments to carry over to field performance. After 7 years, however, seedlings grown in pasteurized potting medium survived better than those grown in nonpasteurized medium. Furthermore, survival of benomyl-treated seedlings in pasteurized potting mixture was higher than survival of those grown in pasteurized mixture without any fungicide treatment and survival of ethazol-treated seedlings in unpasteurized mixture was lower than those in unpasteurized mixture without fungicide treatment. There was no evidence that the nursery treatments adversely affected seedling height or mycorrhizal development.