Root Rot of Red Raspberry Caused by Phytophthora citricola and P. citrophthora in Chile. B. A. Latorre, Facultad de Agronomía, Pontificia Universidad Católica, Casilla 306-22, Santiago, Chile. R. Muñoz, Facultad de Agronomía, Pontificia Universidad Católica, Casilla 306-22, Santiago, Chile. Plant Dis. 77:715-718. Accepted for publication 15 February 1993. Copyright 1993 The American Phytopathological Society. DOI: 10.1094/PD-77-0715.

Outbreaks of root rot on red raspberry occur frequently in Chile and often are related to excess soil moisture. Aerial symptoms, including leaf chlorosis, wilting of primocanes and floricanes, poor growth of floricanes, and poor emergence of primocanes, are always associated with root necrosis. Diseased plants eventually die. Phytophthora citricola and P. citrophthora were consistently recovered from the roots of symptomatic plants of the cultivars Willamette and Glen Clova. These pathogens were identified on the basis of morphological features of sporangia and sex organs and mycelial growth at different temperatures. P. citricola has been previously associated with root rots and decline of red raspberry, but this is the first report of P. citrophthora as a pathogen on red raspberry and the first confirmed report of any Phytophthora species causing root rot of red raspberry in South America.