Control ofSeptoria nodorumon Wheat with Crop Rotation and Seed Treatment

Abstract

Crop rotation [with oats] and seed treatment [with benomyl] were tested to determine their effects on disease development of glume blotch of wheat caused by S. 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 (.ltoreq. 20%) but not when disease severity was high. A significant negative correlation between percent glume blotch and 1000-kernel wt was observed when disease severity was low (.ltoreq. 20%).