Symptoms of the lower leaves more disease. First from the leaf margin or tip of the disease. The lesions invading from the tip of the leaf are wedge-shaped, oblong or irregular along the main vein; the lesions invading from the leaf margin are semi-circular or long semi-circular, the lesion is brown or dark brown, and there is no obvious ring pattern. The rim is yellow-brown, with many unobvious little dark spots on the lesions, namely the conidia of the pathogen.
The pathogen, Colletotrichum truncatum (Schw.) Andr. et Moore, called Platycladus spp. Domestic reports include C.arachidis Sawada C.mangenoti Che. and C.dematium (Pers.ex Er.) Grove. All belong to the genus Deuteromycodon spp. Can cause the disease, different types of strains cause slightly different symptoms.
The route of transmission, disease conditions, and methods of prevention need further study.
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