The identification and biological characteristics of the anthracnose pathogen of Southern Chinese yew

The results of the identification and biological characteristics research of Colletotrichum spp.on Southern Chinese yew in Mingxi of Fujian proved to be Colletotrichum gloeosporioides(Penz.) Sacc.The mycelia grew best on the Czapek'Agar;The optimum temperature and pH for hypha growth was 25 ℃ and 7,respectively while those for conidium formation was 30 ℃ and 8;The alternation of light and darkness every 12 hours was found to be conducive to the hypha growth and the natural light to the conidium formation.The optimum carbon source and nitrogen source for hypha growth was glucose and protein peptone,respectively while those for conidium formation was sucrose and beef extracts;The optimum temperature and pH for the conidium germination was(25 ℃) and 6,respectively;The conidium could germinate in relative humidity 70%-100% or in water,but the conidium has high germinate rate (76.18%) only in drops of water,The conidium couldn't germinate at lower than 60% RH;The light was beneficial for the conidium germination.