Dr. D. S. KELAIYALAVANYA N20101200502023-12-152023-12-152022-09https://krishikosh.egranth.ac.in/handle/1/5810203384Castor (Ricinus communis L.) is one of the most important non-edible oilseed crop in the world. It is a species of flowering plant in the spurge family, Euphorbiaceae. The Ricinus communis plant’s seeds contain more than 45 per cent oil that is rich in triglycerides, primarily ricinolein oil. Castor oil and its derivatives have long been used as a lubricant, and as a result, they have wide range of commercial applications. Though castor is seriously affected by many diseases, root rot caused by Macrophomina phaseolina (Tassi) Goid. is one of the devastating serious disease of castor. More or lessregular occurrence of this disease in moderate to severe form causes considerable yield losses in many pockets of Saurashtra region of Gujarat.EnglishThesis