In Chile, yellow rust (Puccinia stríiformis Westend) attacks wheat fields in the whole country. But where this rust is a serious phytopathological problem and a limiting factor to wheat yields, is in the Central South and South parts of Chile, that is in the area comprised between the parallels 36ºS and 43ºS. Four races were identified by Dr. W. Straib on yellow rust samples collected in Chile in 1936. In the period 1969-1980, in which our country has been cooperating to the YRT, organized and directed by the Phytopathological Research Institute (IPO) from Holland and the Biologische Institute from Braunsdrwig, West Germany, 17 different yellow rust races have been identified, in Holland and West Germany, on rust material collected in Chile. The most common races were: 108 E 141, 104 E 9,0 E 0 and 106 E 11. These races varied in the number of genes or factors for virulence on the differential varieties, from 0, as was the case of race O E 0, to 9 and 10, as ocurred with the races 236 E 141 and 108 E 237, respectively. ln relation to the race 236 E 141, identified in 1980 by Dr. R. W. Stubbs in Holland, it was demostrated that about 65 per cent of the germplasm for resistance to stripe rust, included in the Crossing Block at La Platina Experiment Station, was susceptible. |
ChileanJAR
