Black heart disease of potato
(disease diagnosis)
It is mainly the potato storage device that suffers. In the central part of the tuber, it forms an irregular pattern from black to blue-black, and develops into a black heart from point to tuber. With the serious development, the whole potato pieces can be discolored. The boundary of the victimization of the black heart is obvious. In the later stage, the black heart tissue gradually hardens. At room temperature, the black center can soften and turn black. Different tubers have very different responses to causing black hearts.
(etiology)
This is a physiological disease caused by respiratory asphyxia caused by insufficient oxygen supply to the internal tissue of the tuber. In different environmental conditions, from the internal pink brown to necrosis, to the serious development of the black heart, are caused by hypoxia. When oxygen is removed from the tuber tissue or cannot reach the internal tissue, the black heart develops gradually. At the same time, the development of black heart is affected by temperature. When the temperature is low, the black heart develops slowly; but when the temperature is too low (0-2.5 ℃), the black heart develops rapidly; and at extremely high temperature (36-40 ℃), even if there is oxygen, it will develop because it can not spread quickly through the tissue. Therefore, too high, too low extreme temperature, too closed storage conditions (poor permeability), will aggravate the black heart disease.
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Prevention and control techniques of black heart and hollow potato
Black heart and hollow potato are physiological diseases of potato. The specific etiology, symptoms and control methods are as follows: 1. Black heart disease of potato tuber 1. Symptoms of the disease appear in the center of potato tubers with irregular patterns from blue to black, and in severe cases, more than half or the whole tuber will turn black. two。 The disease is caused by anoxia in potato tubers. In potato storage, when the storage cellar is tightly sealed or the potato pile is too large, the potato cultivation soil is hardened and impervious, which will occur due to the lack of internal oxygen supply.
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Potato ring rot
The disease is a bacterial vascular bundle disease, which is characterized by dwarf and wilting of aboveground stems and leaves and annular rot of underground tubers along the vascular bundle ring. The early and severe disease leads to the death of seedlings; most of the diseased plants grow slowly, dwarf and thin, few branches, small leaves, and wrinkle but not spread; if the disease is late and light, the plant height, leaves and branches grow normally, but the top leaves become smaller. In the later stage, the first or second branches or the whole plant wilted. The symptoms are most obvious after flowering, the lower leaves wilt, droop and die at first, and the upper leaves curl inward from the edge, showing dehydration, turning grayish green, and then
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