1 Symptoms and diseases mainly occur on old leaves and old leaves, and may also harm young leaves and shoots. Leaf lesions usually start from the tips of the leaves or leaves, first as yellowish-green patches, followed by brown, nearly round, semi-circular, or irregularly shaped patches. There are generally dark brown and brown concentric ring patterns with brown edges. The line between the bulge and the healthy part is clearly visible;
2 Pathogens are semi-known fungi, Ascvchyta sp. (Ascvchyta sp), conidia near-round, twin cells.
3 Infection cycle pathogens use mycelium or conidia to overwinter in diseased tissues, and conidia are produced in the next spring when the conditions are appropriate, and spread by wind and rain. The conidia germinate in water droplets, invade the leaves and shoots from the wound, and spread in the tissue, creating new lesions, and later forming spores, continuing to infect.
4 Incidence conditions can occur throughout the growing season, but the occurrence of high temperature, rainy summer and autumn is the highest; especially when the temperature is 25-28°C, and the relative humidity is 80%-85%, the disease becomes more severe. The fungus is a kind of weak parasite, and the wound is the main way to invade it; therefore, diseases such as extensive management, weed growth, and mites are often severe when the disease occurs. In addition, poor drainage, dense planting, and high humidity are also serious.
5 Prevention
5.1 Strengthen Management Attention to the application of nitrogen, phosphorus, and potassium fertilizers to make plants grow robustly. Remove weeds and loosen soil in time. Do a good job of drainage work to improve plant resistance to disease.
5.2 Doing well in field hygiene Remove litter and burn it in winter to reduce the source of infection.
5.3 Chemical control 5 to 6 months of early onset of spraying, severe onset in July to August and then spray again. In particular, after a long drought in summer, the rain should be sprayed immediately after the rain is clear to prevent the disease from spreading. The agent can use polyoxin 100 ~ 200mg / L, or 25% sterilization Dan wettable powder 400 times, or 50% thiophanate-methyl wettable powder, 50% carbendazim wettable powder, 50% benomyl Ling wettable powder 1000 times each spray control.
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