"Black-walnut canker caused by a Nectria."; "Ashcroft, J. M. (Joseph Myers), 1900-"; "Walnut--Diseases and pests.", "Nectria.", "Canker (Plant disease)"; "Ashcroft, J. M. (Joseph Myers), 1900-"; "1932"; "Journal article reprint from: Phytopathology, v.22:no.3 (1932:Mar.)"; ""; "P17168"; "pec"; "Walnut--Diseases and pests.", "Nectria.", "Canker (Plant disease)"; "14256"; .