Dilution Average number of local lesion /leaf* undiluted 40 10-1 30 10-2 16 10-3 10 10-4 04 10-5 00 10-6 00 *Average number of local lesions/plant bases on three experiments with 3 plant of C. amaranticolor having 6 leaves each.

Table 2: Effect of dilution of crud sap on the infectivity of virus.