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Effect of Wheat Host Cultivars on Pycnidiospore Production by Septoria tritici. F. J. Gough, Research Plant Pathologist, Federal Research, Science and Education Administration (SEA), U.S. Department of Agriculture, Stillwater, OK 74074; Phytopathology 68:1343-1345. Accepted for publication 18 April 1978. This article is in the public domain and not copyrightable. It may be freely reprinted with customary crediting of the source. The American Phytopathological Society, 1978.. DOI: 10.1094/Phyto-68-1343.

Pycnidia of Septoria tritici in leaves of moderately-resistant wheat cultivar TAM W-101 and susceptible cultivars Improved Triumph and Triumph 64 liberated 2.0-2.5 times more pycnidiospores per pycnidium than did pycnidia in leaves of resistant cultivar Oasis. This relationship of pycnidiospore liberation to disease reaction class of the cultivar occurred whether plants were incubated in a greenhouse or a growth chamber. However, the average pycnidium produced in a growth chamber released about twice as many pycnidiospores as the average pycnidium produced in a greenhouse regardless of cultivar.

Additional keywords: Septoria leaf blotch, speckled leaf blotch. Triticum aestivum, resistance, susceptibility.