The research findings of my M.sc (Plant Pathology) work has been presented in this book. The research was conducted at CCS Haryana Agri. University in Hisar, Haryana, India. The key objectives of the research was to study the effect of the fungus Sclerotium rolfsii on seed germination and seedling vigour of sunflower hybrids and secondly to manage the disease collar rot caused by fungus Sclerotium rolfsii through host resistance, fungicides and bioagents. Sunflower is an oil producing crop and is cultivated all over the world. Sunflower oil is preferred among the consumer's due to its health...