The volatile compounds myrcene, limonene, a-pinene, a-terpineol, D-fenchol and 1,8-cineole, present in the oleoresin fraction of coniferous wood, were tested individually and as mixtures for their effect on the growth and peroxidase activity of cultures of six strains of Phellinus pini (Fr.) A.Ames and one strain of Phellinus chrysoloma (Fr.) Donk (Phellinus pini var. abietis (Karst.) Pilát). Phellinus pini was more tolerant of the substances than Phellinus chrysoloma. There were differences in the tolerance and peroxidase activity between the strains of Phellinus pini. Peroxidase activity was generally higher in the test cultures than in the controls, but was lower in cultures exposed to 1,8-cineole and a-terpineol.

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