Control of Septoria nodorum on Wheat with Crop Rotation and Seed Treatment. H. H. Luke, USDA, ARS, Plant Pathology Department, University of Florida, Gainesville 32611. P. L. Pfahler, Agronomy Department, University of Florida, Gainesville 32611, and R. D. Barnett, Agricultural Research and Education Center, University of Florida, Quincy 32351. Plant Dis. 67:949-951. Accepted for publication 10 February 1983. 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, 1983. DOI: 10.1094/PD-67-949.

Crop rotation and seed treatment were tested to determine their effects on disease development of glume blotch of wheat caused by Septoria nodorum. Crop rotation did not reduce disease development when infected seed was used. Seed treatment in conjunction with 1 yr of rotation did not significantly reduce disease development but seed treatment plus 2 yr of rotation reduced the amount of disease at all assessment dates. When uninfected seed was used, 1 or 2 yr of rotation significantly reduced disease development. A significant positive correlation between disease on the glumes and seed infection was found when disease severity was low (≤20%) but not when disease severity was high. A significant negative correlation between percent glume blotch and thousand kernel weight was observed when disease severity was low (≤20%).