Abstract:

The aim was to investigate the sexual stage of the root rot disease pathogen in Jatropha curcas L., and provide the epidemiology and control measures for the disease. By ways of field investigation, specimen collection, isolation, cultivation, pathogenicity test, morphological characteristics observation, combined with literature reviews, sexual stage of the pathogen was identified. The sexual stage of the pathogen was only produced in shading and moist environment, with different provenances of host plants being planted together; pathogenicity test showed that the teleomorph was virulent to the host plant, and the reisolates had similar morphological characteristics with that of original anamorphs; the teleomorph was identified as Haematonectria haematococca (Berkeley & Broome) Samuels & Nirenberg, and the anamorph Fusarium solani (Martius) Appel & Wollenweber. Sexual stage of the pathogen could be produced under certain conditions. Avoiding the mixed plantation of different provenances, keeping ventilation and light- penetrating, and decreasing relative humility were the measures to prevent the disease fast spreading.