Abstract:

In order to identify the pathogeny and pathogenicity of branch rot of Jatropha curcas. Branch rot of Jatropha curcas caused by Lasiodiplodia theobroma was reported, illustrated and literal description was given in detail based on the materials from YuanMo, Yunnan in China. Morphological and molecular data were taken into consideration when the pathogen was authenticated. In view of available references, the author thought that was the first report about it. The author gained some results after finished the study about the biological characters of pathogen, pathogen grow actively in the condition of 28-30℃, pH=5-7, the culture medium with C6H12O6, C12H24O12, yeast powder. Sporegermination was more active in the condition of 20-30℃, pH=6, humidity (90%-100%), sterile water. It can produce a few spore and spore apparatus under light. Mycelial growth was significantly inhibited in PDA plate which contained Propiconazol Carbendazim, at the same time, the interesting phenomenon was found that mycelial was fast growing in the PDA plate which contained Difenoconazole, Streptomycin, Chlorothalonil, Ethylicin, Propiconazole, etc. That was like in the PDA plate. The author thought this disease was rampant when hosts were wounded and ecology environment was high humidity based on analyzing biological nature of pathogen and ecology environment of host. After that the author had some good ideas about disease prevention and cure which disease should mainly be prevented and the use of pesticides scientifically must be adopted.We gained some results after finished the study about the biological characters of pathogen, pathogen grow actively in the condition of 28-30℃, pH=5-7, the Czapek culture medium with C6H12O6, C12H24O12, yeast powder. Sporegermination is more active in the condition of 20-30℃, pH=6, humidity=90-100%, sterile water. It can produce a few spore and spore apparatus under light. Mycelial growth was significantly inhibited in PDA plate which is contains Propiconazol Carbendazim, at the same time, the intertesting phonomenon was found that mycelial is fast growing in the PDA plate which is contains Difenoconazole, Streptomycin, Chlorothalonil, Ethylicin, Propiconazole, et. That is like in the PDA plate. We think this disease is will rampant when hosts ware wounded and ecology environment is high humidity based on analyze biological nature of pathogen and ecology environment of host. After that we have some good ideas about disease prevention and cure which is disease should mainly be prevented and scientifically use pesticides must be adopted.