Chitosan Delayed Conidium Germination and Mycelia Growth of Carbendazim-resistant Colletotrichum gloeosporioides Causing Mango Anthracnose in Thailand

摘要

The tested chitosan showed clearly delay in conidial germination of carbendazim resistant C. gloeosporioides for 24 hr in slide culture when treated separately with three chitosan groups were tested as follows:-, commercial chitosan solution group: CC1 and CC2 applied at 1 cc/l, polymer chitosan group: PCI [poly-(1,4-p-D-glucopyranosamine] and PC2 [poly (D-glucosamine] applied at 0.5%, 1.0% and 1.5%, and oligomer chitosan group: OC1 (oligomer chitosan solution) applied at 1 cc/l and OC2 (chitosan oligosaccharide lactate) applied at 0.5%, 1.0% and 1.5%. The chitosan CC1 and CC2 at 1 cc/l, and PCI and PC2 at 0.5%, 1.0% and 1.5% were separately spread over potato dextrose agar and placed culture dish onto the middle Petri dish. Result showed that the tested chitosan were delayed the mycelial growth of carbendazim resistant C. gloeosporioides.