Studies on the Biological Characteristics of Colletotrichum gloeosporioides Penz on Chinese Wolfberry

Effects of environmental conditions on the mycelial growth, sporulation, conidial germination of Collectotrichum gloeosporioides Penz were studied and its lethal temperature was detected. The results showed that the temperature ranging from 10 ℃ to 35 ℃ was available for the mycelial growth and sporulation of Collectotrichum gloeosporioides, but the optimum temperature was 30 ℃.This pathogen could possess the ability to grow and generate spores under pH 3 to pH 10, while the optimum of mycelial growth was pH5 to pH6 and the optimum of sporulation was pH 3 to pH 4,respectively. Treatments of darkness, fluorescent light and alternative fluorescent light displayed no significant effect on the mycelial growth, but could promote sporulation slightly. Collectotrichum gloeosporioides Penz could get a normal mecylial growth and generate numerous spores on the medium containing glucose, sucrose and maltose.(30 ℃) and pH 7.0 were the optimum conditions for the conidial germination while light conditions had no influence on it. The solution containing 1% maltose, in water or in RH 100% were the best for the conidial germination and the conidial could get the highest germination rate. The lethal temperature for this pathogen was 60℃ remaining 30 minutes or 65℃ remaining 5 minutes.