As the weather gets warmer, the Beijing area has entered the sweet potato seeding period. Combined with the characteristics of pests and diseases in Beijing in previous years, it is necessary to strictly prevent three common diseases such as stem nematode disease, viral disease and black spot disease in the sweet potato seedling stage.
Sweet potato stem nematode disease is also known as heart disease, hollow disease, potato seedling disease, near-surface appearance becomes green, no obvious edge and disease spots, seedling root damage, brown halos on the epidermis, resulting in stunted, short hair yellow. Linyi Fertilizer Network Copyright
The virus disease is also called mosaic disease. In the early stage of the disease, the young leaves are light green, the leaves are thin and uneven, and then the color is yellow-green and yellow, and the leaves are in the form of mosaics. The internodes are shortened and the growth is obviously weak. Subsequently, the degree of mottled leaves increased, and large areas of dark brown necrotic spots appeared. The incidence of old leaves was particularly serious, which could cause the leaves to shrink, deform or twist. Linyi Fertilizer Network Copyright
Black spot disease is also called black shank disease. The diseased potato seedlings are yellow and thin. The black-brown oval or diamond-shaped lesions are produced in the stem base of the seedlings. Black thorns or powders are produced in the later stage. When the seedlings are black, the seedlings are black. . Linyi Fertilizer Network Copyright
Control measures: Linyi Fertilizer Network Copyright
(1) The seedbed disinfection is selected to build a seedbed without disease and health, and the seedbed is best to change soil every year. The old seedbed is sterilized with 50% carbendazim WP or 70% thiophanate-methyl WP. Linyi Fertilizer Network Copyright
(2) Seed potato selection and disinfection Select disease-free seed potatoes, that is, potato pieces that remain intact in appearance. It is best to choose a virus-free seed potato to prevent viral diseases. The selection of resistant varieties, such as Shangshu 19 and Longshu 9 is better. Before seeding, it can be soaked in warm water of 51~54 °C for 10 minutes, or 50% carbendazim WP 500 times or 70% methyl thiophanate 700 times solution for 5 minutes. Linyi Fertilizer Network Copyright
(3) After spraying the fertilizer to remove the potato, spray the seed potato surface with 50% carbendazim WP 500 times or 70% thiophanate 800~1000 times. Linyi Fertilizer Network Copyright
(4) Before cutting the high-cut seedlings, cut the seedlings at a distance of three centimeters from the place to avoid bringing the pathogens in the seedbed into the field. Linyi Fertilizer Network Copyright
(5) Elimination of diseased seedlings For potato seedlings with symptoms of viral disease, they should be removed immediately to prevent the spread and spread of viral diseases. Linyi Fertilizer Network Copyright
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