Sclerotinia Diseases of Sunflower in Nebraska

Sclerotinia is a common and widespread soilborne fungal pathogen. In temperate regions of the world, it is often considered the most serious pathogen of sunflowers because it is capable of infecting multiple organs such as roots, stems, buds, and heads. It persists for many years in soils and has a large host range. Significant yield reductions have been documented in all regions of the world. S. sclerotiorum can induce three distinctly different diseases on sunflowers: basal stalk rot and wilt; mid-stalk rot; and head rot. The most effective methods of control integrate cultural practices, fungicide use, and genetic resistance.