Studies on ectomycorrhizae of pine.

Infection of feeder roots of Pinus echinata by the ectomycorrhizal fungus, Pisolithus tinctorius, resulted in an approximate 40-fold increase in the level of 3-carene, and Ccnococcum graniforme induced an approximate 30-fold increase in β-phellandrene. Vapors of these volatile compounds affected the vegetative growth of different ectomycorrhizal and root pathogenic fungi to different degrees in laboratory experiments.