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Five wheat genotypes with differing field resistance to Cochliobolus sativus were tested in greenhouse conditions for their reaction to 1.0 mM helminthosporol (HL) toxin and for their resistance to the pathogen at the 4-leaf seedling, booting, anthesis completed and late milk grain stages. HL caused distinctly necrotic and chlorotic lesions only on the adult plants of highly susceptible genotypes...