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Needlecasts of Scots pine Christmas trees in western Montana Public Deposited
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Needlecast fungi were found on 95 percent of damage collections in a June survey of Scots pine (Pinus sylvestris) Christmas tree plantations in the Kalispell Basin western Montana. Western gall rust (Endocronartium harknessii) and pine bark aphids (Pineus sp.) were present on 6.6 and 2.5 percent of collections, respectively. Cylcaneusma minus was the most prevalent needlecast pathogen. Type 2 Leptostroma and Lophodermella concolor also were common. Mature apothecia of Lophodermium setitiosum were common in August collections. Control strategies for these needlecast diseases are discussed.
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