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Eastern Dwarf Mistletoe: Distribution and Severity in Black Spruce Stands of Newfoundland. Pritam Singh, Forest Pathologist, Newfoundland Forest Research Centre, Canadian Forestry Service, Department of the Environment, P.O. Box 6028, St. Johnís, Newfoundland, Canada A1C 5X8. Plant Dis. 66:312-316. Accepted for publication 22 June 1981. Copyright 1982 American Phytopathological Society. DOI: 10.1094/PD-66-312.

Eastern dwarf mistletoe, Arceuthobium pusillum, has been known in Newfoundland since 1902. It has since become more prevalent and is considered as one of the principal agents damaging black spruce on the island, causing up to 86% infection and up to 37% tree mortality. The distribution of the parasite is patchy in western and central Newfoundland. It is observed in stands of varying age and height and those growing in moist to very wet sites.