The infection cycle of peach canker

Peach canker disease in Kunming aera of Yunnan Province is caused by Fusicoccum amygdali Delacr.. The disease mainly affects 1-year-old twigs of peach tree. The symptom appears dark-brown lesion at leaf scars and bases of the current season's twigs. In 1987 the early infection in orchard occurred at early June, and the disease reached its climax in October. The pathogen developed into dormant stage in November. The inoculation of pathogen showed that the incubation period lasted about 10 days and the successful invasion of the pathogen only appears on injured tissues. The studies indicated that the disease had latent infection. The pathogen winters in the infected twigs in the stage of conidium and mycelium. It can survive in fallen diseased shoots on the orchard ground in winter. The conidia in the rainy season are most dispersed in late July or early August, and their dissemination is related to rainfall.