Indications of heritability of resistance of a cocoa cultivar to Phytophthora palmivora pod rot in Ghana

SUMMARY The cocoa cultivar Y44, a local selection from Ghana showed the least susceptibility to black pod infection in the jield among 20 types tested in a clonal trial. Resistant breeding lines segregated from its jirst generation progeny grown in the jield. The seecllings of the F1 and F, generation inbreds tested arti$cially in the green house segregated into resistant and susceptible breeding lines. The proportions of the resistant lines were similar to that of a known resistant cross included for comparison. The resistance conditioned by Y44 therefore seems heritable ad appears to be polygenic in character.