Comparison of 6 geographic sources of loblolly pine pinus taeda for fusiform rust resistance
Powers, H.R.Jr; Matthews, F.R.
Phytopathology 70(12): 1141-1142
ISSN/ISBN: 0031-949X Accession: 005004535
Loblolly pine seedlings grown from seed collected in 6 geographic areas [Maryland, Louisiana, Texas, Arkansas, Florida, Georgia, USA] across the natural range of this species were inoculated with rust fungi [Cronartium quercuum f. sp. fusiforme] collected from each seed source area. There were significant differences in disease susceptibility among seed sources; the Maryland source was the most resistant. The interactions between specific seed sources and rust fungus collections were highly significant, which indicated that seed from several of the sources can be used to reduce the impact of fusiform rust. Seedlings from all seed source areas were most susceptible to infection by their respective local rust fungus isolates.