Consists of papers concerning Barrus's involvement in plant pathology research and extension work, including press releases, notes, field notes, lecture and seminar notes, reports, correspondence, recommendations, drafts and reprints, research materials, and correspondence with county agents. Also, personal notebooks which detail travel expenses, have garden records, expenses of home ownership and potato spraying records; material concerning Puerto Rico, Costa Rica, Venezuela, Colombia and Mexico; scrapbooks concerning plant disease and extension methods, 1917-1921; manuscripts concerning plant pathology and the history of extension work in that field; and photograph album concerning the Burt Olney Canning Company, Oneida County, New York, ca.1915. Also, taped history of the early years of the Dept. of Plant Pathology by Professor Barrus, October 5, 1954.