Protocol to screen cocoyam accessions for resistance or tolerance to cocoyam root rot disease in Cameroon.
Cocoyam (Xanthosoma sagittifolium) accessions of cv. Macabo were screened for resistance or tolerance to cocoyam root rot disease caused by Pythium myriotylum in Cameroon. Of 626 cocoyams planted in the greenhouse and screened for 21 d, 72 resistant and 210 tolerant suckers were transplanted in a field in Mamu, Cameroon, known to be infested with P. myriotylum. After 3 months of intensive screening in the field, 42 resistant and 35 tolerant accessions of the Roots and Tuber Project were identified.