Symptoms of the main cranberry become dwarfed, lateral branches clumping, pale yellow leaves, thin and small leaves, nicks increased. Lateral roots and fibrous roots are small and numerous. In the seedling stage, the diseased potato is small or non-tuberculous. In the middle and later stages, the infected potato block is small and dry. The potato skin is rough or has protuberances and the color becomes darker. The diseased potato block is generally not boiled and loses its edible value. At present, early infections in Fujian and Taiwan can lead to an unacceptable harvest. In the middle and late stages, the disease yield is low and the quality is poor.
The pathogen Mycoplasma-like organism referred to as MLO, called the mycoplasma. In the bile bile cells of the diseased vegetative bile mycelia, the size of 200-1000nm, the new thin section of the diseased plant can be seen in the electron microscope under the three-layer unit membrane, the inner center is full of nuclear-like fibrous material, may be DNA The genome is surrounded by particles similar to the ribosome. In recent years, it has been found that the combined infection of the rovirus and mycoplasma in the potato virus Y group can also cause sweet potato witches' broom.
Transmission routes and onset conditions Viruses on the diseased cane, diseased potato, or mycoplasma are the primary sources of infestation. Drought and barren land, continuous cropping, and early planting are serious.
Prevention methods (1) Strengthen quarantine, intercept disease sources, control epidemic areas, and prevent the spread of the disease. (2) Select disease-resistant varieties such as Shantouhong, Tongza No.8, Lubeibai, Hubei species, Hongxin Xinjao Bay, Dongliang No.1, Zhangpu No.1, and Shahe Yue. On this basis, a disease-free seeding area was established, and disease-free seed potatoes and seedlings were cultivated. Diseased plants were found to be removed in a timely manner and supplemented with disease-free strong seedlings. (3) Prevent and control poisonous insects such as whiteflies, aphids and leafhoppers in time to prevent pests and prevent diseases. (4) Implement crop rotation, apply compost or decomposed organic fertilizer fermented by bacteria, increase potash fertilizer, timely irrigation, promote robust growth of plants, and increase resistance to disease. (5) Sweet potato and soybean, peanut interplanting control effect is obvious.
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