36 disease-resistant phenotype clones of slash pine selected from seriously infected plantations in Jiangxi province were tested by artificial inoculation with Lecanosticta acicola. The resultsshowed that 22 of the 36 clones are highly resistant to brown-spot disease. The resistance of theseclones was also tested by treating needles in vitro with crude metabolic toxin extracted from brown-spotfungus culture. The results were basically in agreemeat with that obtained by artificial inoculation (r =0. 80).