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https://www.fs.usda.gov/treesearch/content/pdf?name=Pathogenicity%20Of%20Nosema%20fumiferanae%20(Thomson)%20(Microsporida)%20In%20Spruce%20Budworm,%20Choristoneura%20Fumiferana%20(Clemens),%20And%20Implications%20Of%20Diapause%20Conditions