Dry heartburn, also known as focal edge, rotten heart disease, and flaky skin, is an important physiological disease of Chinese cabbage, which occurs in various degrees in various regions. Cabbage takes place from the rosette to the ball stage. During the rosette period, the top edge of the heart leaf was translucent and water stained. Afterwards, the lesions expanded, the leaf margin gradually dried yellow, turned outwards, withered, shrunk into a white dry belt, and was dry paper; the leaf tissue was water stained. The veins are dark brown and the diseased juice is sticky, but there is no odor. The boundary between the diseased part and the healthy part is clear. Sometimes there is dry rot or wet rot. When the disease is severe, the outer leaves grow fast and the inner leaves grow slowly, causing the outer leaves to stand upright. , The heart is short and has lost its food value. During the ball stage, the leaves of the middle of the leaf were affected. After the onset, the appearance of the leaf ball was normal. However, after the incision, the edge of the leaf was scorched. Although the leaf ball could grow, the ball was not tight and the disease was hollow. Corrupted by corrupt bacteria and rot, the disease department continues to expand during the storage period of Chinese cabbage.
Prevention. Generally straight-type varieties are more resistant to disease. Irrigation should be carried out in the morning and evening. During the rosette period, it should be kept dry and wet, and the bulbous period should always be kept moist. Add organic fertilizer. NPK fertilizer should be used in conjunction. Cabbage in the rosette stage is sprayed with manganous fertilizer, once every 5-7 days, and even sprayed 3-5 times. Use 0.7% manganese sulfate solution, or 70% mancozeb 500-800 times solution, or 58% add frosted manganese zinc 200 times solution. During storage, the control of the cellar temperature around 0 °C and relative humidity of 90% to 95% can reduce the incidence rate.
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