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Sweet potato, Ipomoea batatas (L.) Lam., is a dicotyledous plant that belongs to the family Convolvulaceae. It is originated from Central America and the North Western part of South America from where it was introduced to Europe by Columbus and to Asia, Africa and North America by Spanish and Portuguese explorers and traders. It is an herbaceous perennial crop with edible tuberous root that is usually long and tapered, with a smooth skin whose colour ranges between red, purple, brown and white. It can be cultivated throughout the tropical and warm temperature region wherever there is sufficient water to Sweet potato, Ipomoea batatas (L.) Lam., is a dicotyledous plant that belongs to the family Convolvulaceae. A number of plant parasitic nematodes have been reported to be associated with sweet potato in India and among the species identified, Meloidogyne incognita is one of the economically important nematode which makes the way for the secondary infection by different pathogens like Pythium, Fusarium and Ralstonia in the soil. A roving survey was conducted for incidence of root-knot nematode in sweet potato during kharif season in 2018-2019 at Bidar, Bagalkot, Vijayapura, Belagavi, Dharwad and Chikkamagaluru districts of Karnataka. Survey conducted in eight taluks comprising of 38 fields, the major symptoms recorded during survey are having root galls, yellowing, marginal and tip drying of leaves and galling and rotting of roots. The results revealed that highest root-gall index was recorded in Belagavi followed by Dharwad, Bagalkot, Bidar, Mudigere districts. The lowest incidence was observed in Vijayapura. K e y w o r d s

Roving Survey for Root-Knot Nematode in Major Sweet Potato Growing Districts of Karnataka, India