Abstract
A 10-.mu.l drop of inoculum containing .apprx. 500 conidia (50,000 conidia/ml) of Exserohilum turcicum was applied to leaf surfaces of 11-day old corn (Zea mays) seedlings. After 10 days, susceptible inbred lines could be distinguished from lines with either of the dominant resistance genes Ht1 or HtN based on incubation periods and lesion characteristics. This technique was also effective in determining the portion of an inbred population carrying the HtN gene.

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