POSTERS: Analytical and theoretical plant pathology
Phytophthora canker affecting CCN51 clones on high productivity cacao farms in Ecuador
Alina Puig - USDA-ARS. Carmen Suarez-Capello- Mars Inc., Osman Gutierrez- USDA, Jean-Philippe Marelli- MARS/USDA Cocoa Laboratory
Canker incidence ranged from 0 to 28% of trees, with more infections observed during the dry season (Jun-Aug). Cankers reach up to 2 m in vertical length but do not cause mortality. No canker was observed on trees of the Nacional background genotype, supporting the hypothesis that CCN51 is relatively more susceptible. Pod infection was greatest from Jan-Mar, with 1.2-6.9% of pods infected per tree. No relationship was found between pod infection and canker. In addition, planting density did not appear to affect disease development, with the most densely planted lot (1800 plants/ha) having the lowest incidences of pod rot and canker. In addition to providing valuable baseline disease data for CCN51 in South America, this study identifies contributing factors for canker development.