Susceptibility of Five Provenances of Ponderosa Pine to Dothistroma Needle Blight. R. H. Eldridge, Research Officers, Forestry Commission of New South Wales, Wood Technology and Forest Research Division, P.O. Box 100, Beecroft, N.S.W., Australia, 2119. H. Dowden, Research Officers, and P. Lind, Biometrician, Forestry Commission of New South Wales, Wood Technology and Forest Research Division, P.O. Box 100, Beecroft, N.S.W., Australia, 2119. Plant Dis. 64:400-401. Copyright 1980 American Phytopathological Society. DOI: 10.1094/PD-64-400.

An 11-yr-old provenance trial of Pinus ponderosa was assessed for differences in susceptibility to Dothistroma septospora. Marked differences in percentage of needles infected, number of lesions per needle, and percentage of dead needle tissue indicated two groups. When grown in an inland area with little maritime influence, provenances from inland regions were less susceptible to Dothistroma than were trees originating in humid coastal climates.