Description: English: Photograph of Ceratocystis fagacearum (oak wilt fungus) endoconidia. Date: 1 January 1999. Source: USDA-FS Publication: How to collect field samples and identify the oak wilt fungus,
http://www.na.fs.fed.us/spfo/pubs/howtos/ht_oaklab/laboratory.htm. Author: All Photo credits from publication: Steve Cook, Cook Company, St. Paul, MN Sandra Gould, U of MN, Plant Disease Clinic Rich Hauer, MN Department of Agriculture, Photo Archive Jill Pokorny, USDA Forest Service, St. Paul, MN Stephen Stenger, Kunde Co., Roseville, MN.