Pathogenicity Tests of Philippine Isolates of Blast Fungus Using Two Sets of Rice Varieties

Abstract

The Kiyosawa differential set is not very suitable to differentiate Philippine isolates of rice blast. Philippine isolates which are virulent to IR1905-81-3-1 are likely to be virulent to many other IRRI varieties. Isolates which are virulent to both Tetep and IR1905-81-3-1 are likely to have a broad spectrum of virulence.