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Effects of Fertilization, Site, and Vertical Position on the Susceptibility of Loblolly Pine Seedlings to Fusiform Rust. Roger L. Blair, Research Forester, Southlands Experiment Forest, International Paper Company, Bainbridge, Georgia 31717; Ellis B. Cowling, Professor, North Carolina State University at Raleigh 27607. Phytopathology 64:761-762. DOI: 10.1094/Phyto-64-761.

Loblolly pine seedlings in greenhouse flats were exposed in 1968 and 1969 to natural inoculum at 0.5 and 3.0 m above the ground at three sites which differed markedly in incidence of rust in 1964-65. Some seedlings were fertilized with a nutrient solution (12-6-6, N-P-K) while others were not fertilized. Fertilization and site factors other than soil influenced the susceptibility of the seedlings to fusiform rust, but vertical position apparently did not do so. Fertilization caused a marked increase in rust susceptibility on the three sites tested.