Abstract
A system was devised for differentiating pathotypes of P. sorghi according to their ability to sporulate on inoculated leaves of differential sorghum (S. bicolor) genotypes. In 1980, a new pathotype (pathotype 3) was discovered in Texas [USA] among populations of P. sorghi that sporulates on lines Tx412, Tx430, and CS3541 but not on QL3.

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