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• ☞ Mr. Wu Guobo, Hello, Thank you for your "Chinese vegetable" the support and trust! Black spots on the outer leaves may be caused by the following: 1, Chinese cabbage Alternaria: Major damage cotyledons, leaves Leaf and petiole, pedicel and sometimes harmful species of Viburnum. Infected leaves, chlorosis circular spot near the new-born, after the gradual expansion of the edge of light green to dark brown, a few days after the lesion extended to the diameter of 5 ~ 10mm, and there is obvious Physalospora together. Some spots with yellow halo, hot and humid conditions in the perforation of disease. Incidence of serious汇合成larger plaque lesion, caused by the second half of the entire leaf or dead, whole-plant leaf dry由外向内. On the stem or petiole long fusiform lesion, depression was dark brown stripe. Seed strains of stem, or pedicel victims, oval-shaped lesion, dark brown. Pod species on nearly circular lesion, the center of gray, brown edge, surrounded by light brown, with or without Physalospora, when the humidity level of other Health and dark brown in Plasmopara sp. Belonging to fungal diseases. 2, Chinese cabbage black rot: seedlings excavated before the disease does not emerge, was excavated after the infected cotyledon水浸状root髓部dark, dead seedlings. Adult disease, caused by leaf spot or black veins. Vein extended inward from the leaf margin to form a "V"-shaped brown spot blight. Infected leaves to help the virus to expand upward along the vascular bundles, were light brown, dry rot caused by some outer leaves, leaves to歪向side, and some have a separation off. Bacterial diseases are. 3, Chinese cabbage小黑点disease: Chinese cabbage petiole and veins inside the surface of the medial, lateral veins irregularly shaped strip of long小黑点-like lesions, the size of 0.6 ~ 1mm, the production process occur ssp.chinensis period more less the outer leaves, more leaves, uneven density, we can see the inside of a serious spring小黑点petiole. Will increase the storage process, and sometimes normal cabbage harvest, storage and transportation will occur in小黑点disease. The cause has not yet been found. Diseases caused by different pathogens in different control methods, such as disease prevention and treatment of fungal agents can not prevent bacterial diseases, diseases of the physical is invalid. From your brief description of the disease it is difficult to determine the cause, in order to better carry out service work, please send as much as possible-like, I will be free by experts in the diagnosis and treatment for you, send the way of this Web site please refer to section on diseases journal Help for help.
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