Susceptibility of Longleaf Pine Seedlings toCronartium quercuumf. sp.fusiformein Greenhouse Tests

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Abstract
Seedlings from families of 13 wind-pollinated longleaf (Pinus palustris), 2 loblolly (P. taeda), and 2 slash (P. elliottii var. elliottii) pines were inoculated with basidiospores of Cronartium quercuum f. sp. fusiforme. Inoculum was derived from galls on 30 naturally infected longleaf pines. Incidence of infection in families of longleaf pine seedlings ranged from 16 to 38% compared with 33 to 86% for families of slash and loblolly pines. Screening longleaf pine families by inoculation of seedlings with basidiospores appears feasible.

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