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Relative Susceptibility of Small Grains to Take-all. Craig S. Rothrock, Department of Plant Pathology, University of Georgia, Georgia Station, Griffin 30223. . Plant Dis. 72:883-886. Accepted for publication 15 May 1988. Copyright 1988 The American Phytopathological Society. DOI: 10.1094/PD-72-0883.

Wheat, triticale, barley, rye, and oats were examined for relative susceptibility and performance at three infestation levels of a wheat isolate of Gaeumannomyces graminis var. tritici. All the small grains except oats were susceptible to take-all. Wheat was most susceptible. Triticale differed significantly from wheat in disease severity in only one growing season. Barley was significantly less susceptible than triticale or wheat and more susceptible than rye in both growing seasons. Cultivars within each small grain did not differ in susceptibility to take-all with the exception of Dawn barley, which had lower disease incidence and severity than the other barley cultivars tested. Take-all significantly reduced grain yield for wheat, barley, and triticale in both seasons. Wheat had the greatest yield reductions, followed by triticale and barley. Plant height, tillers per meter, and thousand kernel weight also were reduced by take-all for these three small grains. No reduction in grain yield, yield components, or plant height was found for rye. There were significant differences in reductions in yield, tillers per meter, thousand kernel weight, and plant height among cultivars of barley, triticale, and wheat.

Keyword(s): Avena sativa, Hordeum vulgare, Secale cereale, X Triticosecale, Triticum aestivum.