Abstract
Sunflower is a known host for over 30 pathogens, but the relative importance of specific diseases varies with geographic region. Differences in climate, pathogen distribution, and cropping practices affect the prevalence of individual diseases in each region. This chapter discusses two tables of selected diseases, which list diseases considered to be of widespread importance, and selected diseases of regional importance or those that may occur sporadically. It also discusses individual diseases like Downy mildew, Phomopsis stem canker, rust, Rhizopus head rot, Sclerotinia head rot, Sclerotinia stalk rot and wilt, and Verticillium wilt, and their effects on sunflower production. Sunflower producers face several challenges when managing sunflower diseases, most notably pathogens that can cause significant yield loss under a variety of environmental conditions, variable pathogens, and limited management tools to the most devastating diseases. However, pathologists and breeders are continually working to develop and deploy new management tools that can mitigate yield losses to diseases.
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