VIEW ARTICLE

Etiology

Identification of Pythium ultimum in the Collar Rot of Apple. A. Bielenin, Associate Pathologist, Institute for Pomological Research, 96-100 Skierniewice, Poland; Z. Borecki(2), and D. F. Millikan(3). (2)Chief of Phytopathology Section, Institute for Pomological Research, 96-100 Skierniewice, Poland; (3)Professor of Plant Pathology, University of Missouri, Columbia 65201. Phytopathology 66:127-129. DOI: 10.1094/Phyto-66-127.

Pythium ultimum causes a collar rot disease on apple similar to that caused by Phytophthora cactorum. Cultures have been isolated from bark lesions and soil, identified, and their pathogenicity demonstrated.