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Helminthosporium setariae on Pearl Millet, Pennisetum typhoides, as Affected by Age of Host and Host Differences¹

A late-maturing synthetic (Late Synthetic), the three cultivars, Common, ‘Starr,’ and ‘Gahi 1,’ the four inbred lines which serve as parents in the production of Gahi 1 seed (Tift 13, Tift 18, Tift 23, and Tift 26), and the six diallel crosses from these four inbreds of pearl millet, Pennisetum typhoides, were inoculated at weekly intervals (1 to 13 weeks of age) with a mycelial-conidial blend of three isolates of Helminthosporium setariae. The average disease reactions were most severe when plants were inoculated at 1 week of age and reactions were progressively less severe each week until about the 6th or 7th week, when reactions began to increase in severity. However, Late Synthetic, Gahi 1, and two of the diallel crosses tended to remain resistant after the 6th week. There were significant differences in average disease reactions of the pearl millet entries. Late Synthetic was the most resistant. Gahi 1 and four of the six diallel crosses were more resistant than the four parent inbreds.

Key Words: resistance • Gahi-I millet • leafspot • disease • seedlings • disease ratings

² Senior Research Plant Pathologist and Principal Geneticist, Crops Research Division, Agricultural Research Service, U. S. Department of Agriculture, Tifton, Ga.

Received for publication May 29, 1967.