Abstract

Thirty-four monosporous isolates ofH. gramineum Rab., the incitant of leaf stripe of barley, were divided in seven categories on the basis of morphological and cultural characters. Seventy-three Indian and American varieties of barley were tested for their reaction against the seven isolates. Detailed observations on prevalence and severity have been taken and a new method has been developed for calculating infection value in each case. There are distinct differences among the isolates in their prevalence and severity on the barley varieties and thus these isolates are distinct races.

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