ABSTRACT
CHANGES IN RACES OF Phytophthora infestans (MONT.) DE BARY OBSERVED IN SOUTHERN CHILE FROM 1963 TO 1977

Carmen Fernández M.1
 

The late blight fungus, Phytophthora infestans, shows a great genetic variablility. Numerous physiological races are known. The presence of. P. infestans races were studied in Southern Chile from 1963 to 1977. Differentials having R1, R2, R3 and R4 genes plus their combinations, were used from 1963 to 1975. Races (0), (1), (2), (3), (4), (1,4) and (2,3) were identified.
Recent studies involving a new set of differenctials containing up to R11 gene, showed a high specialization of the fungus. Complex races like (1,2,4,5,11) and (1,2,4,10,11) were present.

Keywords:
1Ing. Agr., M.S., Programas Fitopatologia y Papa, Estación Experimental Carillanca, Instituto de Investigaciones Agropecuarias (INIA), Casilla 58-D Temuco, Chile.