Abstract
Pesticides were applied to seeds of Caragana arborescens Lam, and Picea pungeas Engelm, at the maximum adhering dosages. The toxicity was evaluated in terms of subsequent germination. Pesticides applied prior to stratification of the seed had little or no influence upon the germination of caragana and spruce seed, with the exception that Ceresan M reduced germination capacity and germination speed of caragana seed and germination speed of spruce seed. Some post-stratification treatments proved detrimental to the germination of seed of both species; Ceresan M, chinosol, and Manzate were essentially lethal; Stauffer N-244, thiram preparates, Spergon SL, and Orthocide 75 proved mildly toxic. Surface sterilization of seed before and after stratification with a 0.5% solution of mercuric chloride with a water rinse was harmless.
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