Resistance of Pinus densiflora and Pinus rigida × radiata to Fomes annosus



The stemwood of Pinus densiflora was found to be more resistant than the stemwood of Pinus rigida × radiata in inhibiting the decaying activity and linear growth of Fomes annosus. The chemical factors responsible for the variations in resistance were extractable in chloroform. One fraction isolated from the chloroform extract of P. densiflora is responsible for its inhibition.