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Poster: Biology & Disease Mgmt: Postharvest Pathology & Mycotoxins


Bitter rot on apple: Comparative epidemiology of Colletotrichum species and growth temperature
R. MOREIRA (1), E. Zielinski (2), A. Filho (3), L. May De Mio (2) (1) Federal University of Parana, Brazil; (2) Federal University of Parana, Brazil; (3) University of Sao Paulo, Brazil

The Colletotrichum genus was reclassified, and based on this new classification were described five species causing Bitter Rot on apple belonging to two complex, C. acutatum complex (CaC: C. nymphae, C. paranaense, C. melonis) and C. gloeosporioides complex (CgC: C. fructicola, C. siamense). However, are unknown the optimum conditions for the development and the impact of each species in the disease progress. Therefore, the aim of this study was to determine, for each species, the optimum temperature and evaluate the infection and colonization in fruits of the cultivar Gala. The optimum temperature for the development of the colonies was 22-24 ° C for CaC, and 25-26 °C for CgC. The progress of the disease was significantly higher in fruit inoculated with CaC than in fruit inoculated with CgC. The incubation period was 2 to 3 days for all isolates in wounded fruit, while in unwounded the period was 18-25 days. The latency period was 7 days to C. paranaense and 6 days to C. nymphae with fruit wounded but in unwounded fruit, only C. paranaense spolulates with higher latency period (33 days).