Bean potato is a common bean crop in life. It belongs to the kind of kidney bean. During the growth of bean and potato, the occurrence of root rot seriously affects the yield and commerciality of bean and potato. This article will introduce the bean and potato root. The method of rot is used for your reference.
[Disease diagnosis] is mainly caused by harmful roots. At the beginning of the onset of the roots, a round, elliptical, or irregularly shaped lesion with a dark brown and a slight depression is formed on the surface. The posterior lesion gradually expands and develops into the inside of the potato, which can be deep into the potato by about 1 mm. When the humidity is high, a white mold layer grows on the lesion. The pathogenic bacteria are Pythium oxysporum and Pythium ultimum. The former sporangium is spherical or fusiform, smooth or thorny, with terminal or intervening, 1 to 3 germ tubes when germinated, no zoospores, no eggs. Spores spherical, colorless, the latter sporangium spherical, nearly spherical, many internate, individual terminal or cut, ovoid spores, colorless, not full of ovipositors.
[Pathogenesis] The pathogens overwinter with oospores on the diseased bodies. After the diseased bodies rot and decompose, the oospores are scattered in the soil to survive. At the same time, the pathogen can also use the hyphae to succumb to the spoilage tissue and produce spores. Most of the pathogens are invaded by the wound, and the conditions are suitable for the disease to develop rapidly. Disease occurrence is closely related to soil temperature and humidity. Generally, when the soil is cold and wet, it is easy to develop. It is rainy in the field, and the water area is developing. Underground pests are also seriously ill.
[Control measures] (1) Select excellent varieties such as Zasha Ge, Shunde Sha Ge. (2) The selection of the terrain is high, the soil is loose, the fertile land is planted, and the sorghum or high ridge is cultivated. (3) Applying decomposed manure. Do the drainage in the rainy season, do not make the area water. (4) Pay attention to weeding and weeding, and thoroughly control underground pests. (5) In the early stage of the disease, use 15% of the manure liquid water 200 times solution, or 72% gram dew wet powder 800 times liquid, or 69% Anke manganese zinc wettable powder 1000 times liquid, or Green Heng 1 3000 times Liquid spray the stem base or root of the plant.
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