Symptoms: At the time of initial onset, the tip of the tip of the leaf and the leaf of the upper part of the leaf produce small spots of light green. As the disease spreads, the disease part appears scorch-like, and gradually expands to the lower part and the inner part of the leaf. The upper part of the leaf blade will die. Three-quarters of the entire blade died. As the leaves lose chlorophyll, their photosynthesis is seriously affected, and the plants grow weak and lose their ornamental value. Since the occurrence of the disease is closely related to rain, the rainy season will be repeatedly infected, and it is generally the most severe from August to October. In addition, poor drainage performance of the land, large soil temperature, and partial application of nitrogen fertilizer can also lead to the occurrence of the disease. Under the conditions of high temperature and strong sunlight in early autumn, the leaves are burned, which will aggravate the development of the disease.
Second, the prevention and control methods: In the fertilization, bogey partial nitrogen fertilizer, appropriate application of phosphorus, potassium fertilizer, to promote robust growth of plants, and enhance their ability to get diseases. Usually watering should not be excessive, but not long-term accumulation of water; usually combined with loose soil, enhance soil permeability, ensure the normal growth and development of the root system, improve absorption function; high temperature season to ventilate and shade to prevent exposure. At the same time to carry out chemical control, with 50% carbendazim 500 times solution or 65% dexamethasone, Fumei Zn 1000 times or 45% dexamethasone 800 times, spraying every 10-15 days, even spray 2-3 Times.
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