Abstract
Responses of Rhyacionia frustrana (Comstock) parasites to height level, orientation, and population density the host were studied in the Piedmont Region of South Carolina. The variation in degree of parasitism and the influencing factors in this study were attributed to variation among plantations and between the height levels of the pine trees. The degree of parasitism of R. frustrana in the top whorl of the pine trees as compared with the lower level was significant at the 1% level. There was no significant difference in parasitism as a result of orientation, number of R. frustrana per pine tip, or the interactions produced by these factors.
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