Triadimefon or triadimenol applied as seed dressings at rates of 0.31, 0.62 and 1.25 g a.i./kg of seed protected emerging seedlings of P. taeda from rust caused by Cronartium quercuum f. sp. fusiforme. Triadimefon was superior to triadimenol. The degree of protection for each compound decreased as seedling age increased. Both compounds were compatible with the animal repellent and fungicide thiram. Triadimefon applied as a seed dressing at a rate of 1.25 g a.i./kg of seed provided protection equal to that of the triadimefon seed soak (800 mg triadimefon/l, 24-h seed soak) currently being used by forest tree nursery personnel; both methods provided adequate protection to emerging seedlings for at least 36 days after sowing.