Survival, but not growth, of Choctawhatchee sand pine exceeded that of Ocala sand pine on a Phytophthora cinnamomi-infested sandhill in west Florida. However, both varieties exhibited relatively high levels of susceptibility to root disease and mortality caused by P. cinnamomi. Longleaf pine survived significantly better than either variety of sand pine and exhibited an apparent resistance to infection by P. cinnamomi. South. J. Appl. For. 17(2):90-95.
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Barnard et al. (1993) studied this question.