Abstract: Separate observations concluded that the primary infections induced principlly either from the flower bud-ends or leaf buds of former year twigs (the biennial twigs),though they did not appear any symptoms. The ability of sporulation and conidial germination were observed.The lesions of the spring shoot were one of the important source of infection to young fruits of camellia. Abundant conidia masses were observed around the base of diseased shoots under high humidity and temperature. The length of latent mycelia in 2-years old twigs were examined.Its distance from the infected spring shoots were no longer than 5cm.So it is necessary to cut with a length of 5cm,beginning from the base of infected shoots in late spring.