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Effect of Seeding Date of Winter Wheat on Incidence, Severity, and Yield Loss Caused by Cephalosporium Stripe in Kansas. Peter J. Raymond, Former Research Assistant and Graduate Student, Department of Plant Pathology, Kansas State University, Manhattan 66506. William W. Bockus, Assistant Professor, Department of Plant Pathology, Kansas State University, Manhattan 66506. Plant Dis. 68:665-667. Accepted for publication 6 March 1984. Copyright 1984 The American Phytopathological Society. DOI: 10.1094/PD-68-665.

A 2-yr field trial was established to study the effects of delayed planting of winter wheat on Cephalosporium stripe (Cs) incidence, severity, and yield loss. There was a significant reduction in Cs incidence with delayed planting in one of the years; however, in the other year, incidence, disease severity, and percentage of yield loss caused by Cs were not significantly affected. Furthermore, there was a 13.7% yield reduction for uninoculated plots with each week of delay beyond the optimum planting date. Thus, in some years under Kansas conditions, a reduction in Cs incidence can be expected with delayed seeding, but this benefit is negated by loss of crop yield potential associated with this practice. The influence of planting date on host resistance reaction to Cs, host ontogeny, and rate of systemic symptom expression was also determined.

Keyword(s): Cephalosporium gramineum.