A Phytotoxic Effect of Captan on the Growth of Conifer Seedlings

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Abstract
Captan was found to have an inhibitory effect on the seedling growth of Picea sitchensis, Pinus sylvestris , and Tsuga heterophylla . A single application of captan reduced the rate of shoot growth for at least two weeks, with a further decrease after a second treatment. Seedlings grown in sand appeared to be more adversely affected than those grown in soil. Weights of root, shoot, and leaves were all reduced in treated plants grown in sand. No phytotoxic effects were detected when captan was applied to tomato, barley, or cress seedlings grown in either sand or soil. It is suggested that the use of captan should be avoided during growth analysis experiments on conifer seedlings, or, if fungal problems make its use desirable, experimentation should be delayed for at least three weeks after treatment.

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