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Resistance

Infection of Shortleaf × Loblolly Pine Hybrids Inoculated with Cronartium quercuum f. sp. echinatae and C. quercuum f. sp. fusiforme. John F. Kraus, Principal plant geneticist, USDA Forest Service, Southeastern Forest Experiment Station, Macon, GA 31208; H. R. Powers, Jr.,(2), and Glenn Snow(3). (2)Chief research plant pathologist, USDA Forest Service, Southeastern Forest Experiment Station, Forestry Sciences Laboratory, Athens, GA 30602; (3)Principal plant pathologist, USDA Forest Service, Southern Forest Experiment Station, GMF, Gulfport, MS 39503. Phytopathology 72:431-433. Accepted for publication 10 July 1981. Copyright 1982 The American Phytopathological Society. DOI: 10.1094/Phyto-72-431.

In this artificial inoculation study interspecific hybrids of shortleaf pine (Pinus echinata) × loblolly pine (P. taeda) were no more resistant to infection by the form of fusiform rust fungus (Cronartium quercuum f. sp. echinatae) that infects shortleaf pine than were seed orchard shortleaf pine. As expected, however, they were much more resistant to infection by the form of the rust fungus (C. quercuum f. sp. fusiforme) that commonly attacks loblolly pine.