How to control turf rust

Rust is a serious disease that harms the lawn. In recent years, all the lawns planted with bluegrass and ryegrass have occurred in the Tai’an area of ​​Shandong Province. The damage is serious and the leaves are yellow and even dead. The lawn becomes sparse and seriously affects the lawn landscape. First, the symptoms and characteristics of the disease can infect a variety of cold-season turf, especially the grassland pods, ryegrass serious damage. At the beginning of the disease, there were light yellow spots on the leaves, and black spores piled on the back of the later leaves. Finally the leaves turned yellow to brown and the lawn became sparse. Second, the onset of illness occurs mainly in the autumn of low temperature and high humidity. When the hot summer season passes, the temperature will drop. Together with the dampness of the air, the disease will quickly occur. It was observed that when the temperature of the 5 cm soil layer reached 24.5°C, the germs began to infest. As the temperature continued to fall, the disease quickly spread if a large amount of rainfall was encountered. Within a few days, the lawn was obviously visible. Yellow, seriously affecting the ornamental nature of the lawn. In addition, poor drainage and excessive application of nitrogen fertilizer in summer can also increase the occurrence of diseases. Third, control methods 1. Strengthen conservation management is best not to apply nitrogen fertilizer, but to maintain the normal proportion of potash, to ensure that the lawn ventilation. Watering should be dry to see, avoid watering in the evening, and pay attention to drainage to reduce relative humidity. 2. Strengthening chemical control The best way to control rust rust is to use fungicides. At the end of August and early September, after lawn mowing, spray 75% chlorothalonil 500 times or 70% mancozeb wettable powder 400 times for prevention and protection. In the early stage of disease, prevention and treatment with 20% Triadimefon EC 800 times can play a good role in prevention and control of turf rust. Second, the selection of disease-resistant grass species or mixed planting with disease-resistant grass species is also an effective and economical method of controlling rust disease.

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