Reaction of field resistant slash pines pinus elliottii var elliottii to selected isolates of cronartium quercuum f sp fusiforme

Walkinshaw, C.H.; Bey, C.F.

Phytopathology 71(10): 1090-1092


ISSN/ISBN: 0031-949X
Accession: 006265206

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Nine isolates of C. quercuum f. sp. fusiforme were pathogenic to 15 field-resistant slash pine (P. eliottii var. eliottii) families in greenhouse tests. Some isolates from random galls were as virulent as isolates derived from galls on a resistant family. Family .times. isolate interactions were significant in 4 experiments with 15 families but were greatly reduced when certain families were omitted from the analysis. Differences in gall incidence were generally significant among families but not among isolates.