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Even-aged loblolly pines in three crown classes chosen to represent varying levels of vigor were inoculated with the blue-stain fungus Ceratocystisminor to induce hypersensitive tissue formation. There were no differences in monoterpene composition of the induced tissue among crown classes growing on the same site. However, there were significant differences in percent composition of individual monoterpenes between trees growing on a poorer wet site and those growing on a better dry site. There were also quantitative and qualitative differences in monoterpene composition of preformed xylem resin compared with the monoterpenes extracted from the hypersensitive tissue. The differences in composition between the preformed resin and resin found in the hypersensitive tissue may reflect, in part, the energy requirements for initiation of the inducible system.

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