Occurrence and distribution of root-knot species of FCV tobacco in Karnataka

FCV tobacco growing areas of Karnataka were surveyed for assessing the incidence and intensity of root-knot nematode and mapping the distribution of Meloidogyne species. The incidence ranged from 53.5–91.3% in the different areas,with more in H.D. Kote, Hunsur, Periyapatna and Ramanathapura than in Shimoga. Thedisease intensity (RKI) varied from 2.0 to 3.1 in all the tobacco growing tracts. Relatively more number of fields were recorded under medium to heavy infection categories. Four species viz., Meloidgyne incognita, M. arenaria, M. javanica and M. thamesi were detected on tobacco crop.