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Abstract
Investigations on canker development in six cocoa genotypes showed IMC 67 to be resistant, ICS 1, TSH 1188 moderately resistant and TSH 1076, SCA 6 and P 18 as susceptible. Plant wound‐healing components (lignin, callose and suberin) were detected in healthy, wounded and wound‐inoculated (Phytophthora palmivora) tissues of all the genotypes, although at different rates. Lignin concentration was negatively correlated with canker lesion size and positively correlated with time of complete healing. A strong positive correlation was also observed between time of healing and lesion size. The rate of healing of uninoculated wounds was fastest in IMC 67, moderate in ICS 1 and TSH 1188 and slowest in TSH 1076, SCA 6 and P 18 while cessation of lesion expansion was observed at 6 weeks in IMC 67, 8 in ICS 1, TSH 1188 and 10 in TSH 1076, SCA 6 and P 18. This study revealed that lignification plays a role in wound‐healing and consequently a role in resistance of coca stems to P. palmivora infection.