Abstract: The present investigation was undertaken with the main objective to determine detection on seed borne Fusarium oxysporum f.sp. ricini and its Pathogenicity were conducted at Department of Applied Botany, PlantPathology laboratory, Kuvempu University, Jnanasahyadri, Shankaraghatta, Shivamogga, Karnataka. Castor is one of the important non edible oilseed crops in India. Wilt of castor is caused by F. oxysporum f. sp. ricini. The objective of this work were to estimate the incidence of F. oxysporum f. sp. ricini in castor seed using different seed health test methods. A total 69 samples were collected from retail shops, APMC markets, fields and farmers of different agro-climatic regions of Karnataka during- 2011.