Abstract
Field studies were done in 1988, 1989, and 1990 to compare the effects of races 0 and 1 of Exserohilum turcicum on sweet corn hybrids with different levels of Ht- and partial resistance to northern leaf blight (NLB). NLB decreased yields of susceptible hybrids in spite of chlolotic lesions, conditioned by Ht-resistance; but NLB has little effect on yields of hybrids with partial resistance. High levels of partial resistance in hybrids with or without Ht genes limited disease severity. Yields of partially resistant Ht-hybrids were within 10% of and not different from noninoculated controls
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