Scots Pine Is Susceptible to Southwestern Dwarf Mistletoe. F. G. Hawksworth, Forest Pathologist, USDA Forest Service, Rocky Mountain Forest and Range Experiment Station, Fort Collins, CO 80526. J. G. Laut, Senior Staff Forester, Insects and Disease Division, Colorado State Forest Service, Colorado State University, Fort Collins 80523. Plant Dis. 65:263. . This article is in the public domain and not copyrightable. It may be freely reprinted with customary crediting of the source. The American Phytopathological Society, 1981. DOI: 10.1094/PD-65-263.

In a small field test in Colorado, Pinus sylvestris was found to be very susceptible to the ponderosa pine dwarf mistletoe, Arceuthobium vaginatum subsp. cryptopodum. Twelve of 16 seedlings were infected after exposure for eight seasons. Thus, Scots pine is not suitable for underplanting in infected ponderosa pine forests.