Lawn brown spot disease, also known as Standing Silk Nuclear Disease, is one of the most widely harmful diseases in lawns. And the disease can affect almost all varieties of currently planted lawns. In particular, the incidence of shearing and precocious grass is the most severe. When the disease is serious, it often causes a large area of baldness on the lawn, which has a great impact on the viewing of the lawn.
1. Symptoms of onset
Symptoms of lawn brown spot disease generally present with annular spots of dry grass. Mainly infested to harm the stem, leaves, sheaths, and cause leaf rot, stem base rot, the roots are often less harmful or not harmful. The affected lawn rings vary in size, and the general dry grass circle can range from a few centimeters to about 2 meters. But there will always be a green lawn in the middle of the dry grass circle, and a circle of dry yellow, shaped like a "frog's eye".
2. Pathogenesis
When the soil temperature reaches 15-20 degrees, the sclerotia of brown spot disease begins to multiply in large quantities, and the hyphae grow, reaching 21-32 degrees is the most suitable period for the occurrence of diseases. When the air temperature is 30 degrees, and the air humidity is large, the night temperature is not less than 20 degrees, the infection is faster and more obvious. Low-lying humidity, poor drainage; high temperature and rainy season; excessive use of nitrogen fertilizer, long growth, night irrigation and other favorable diseases.
3. Prevention and control measures
(1) Since the lawn varieties have different resistance to the disease, the lawn can be mixed and sown, which can reduce the occurrence of the disease.
(2) Cultivate robust lawns. It is necessary to fertilize evenly and rationally irrigate. Increase the application of phosphorus and potassium fertilizer, organic fertilizer, proper control of nitrogen fertilizer, no watering at night.
(3) Drug prevention and treatment. Seeds can be sown after seeding can be mixed with drugs; fungicides can be used to treat the soil and purify the soil. Commonly used pentachloronitrobenzene, dixone, xanthexime and so on.
(4) At the beginning of the onset of Chengping, use propiconazole fungicide and allicin and isobacterium urea compound with sodium compound nitrophenol once in 5-7 days, and it is recommended to spray 2-3 times.
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