Abstract
In the article the results of three-year researches (2008-2010) on corn smut harmfulness on early maturing hybrids are generalized and stated. A potential kill possibility of seeds and radicles infected by Ustilago zeae fungus teliospores is determined. Under artificial infectious ground conditions grain yield decrease from plants infected in a different degree by the disease is determined. The biological threshold of harmfulness is calculated. The role of threshold of harmfulness on the reproductive organs in the tactics of crop protection against the disease is calculated. The photos illustrating radicles, seedlings, stem root neck, caryopsises in cob infection by corn smut are presented
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References
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