Biological characteristics of 2 species of Colletotrichum causing mango postharvest athracnose.

The postharvest anthracnose of mango was caused by Colletotrichum gloeosporioides (Penz.)Sacc. and Colletotrichum acutatum Simmonds. C.gloeosporioides was considered as the major pathogen. The optimum temperature for mycelium growth, sporulation and spore germination of C.gloeosporioides was 28,28 and 32 ℃, respectively, and that of C.acutatum was 26,28 and 24 ℃. The optimum pH value for mycelium growth of C.gloeosporioides and C.acutatum was 5-8, and that for spore germination of C.gloeosporioides and C.acutatum was 7. The optimum pH value for sporulation of C.gloeosporioides was 8, and that of C.acutatum was 3. The mycelia of C.gloeosporioides grew well on media with glucose, fructose and sucrose as carbon source, and the starch could promote sporulation of C.gloeosporioides. The mycelia of C.acutatum grew well with fructose and sucrose as carbon source, and the sucrose and maltose could promote sporulation of C.acutatum. C.gloeosporioides was more sensitive to carbendazim and thiabendazole than C.acutatum.