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I. Symptoms and Causes Stellera Rotariae is an ordinary disease that mainly damages the leaves of Strawberries. The Streptoradiota virescens is a semi-known strawberry Strepto-spora mold. Its fungal pathogens can invade most of the plants on the ground, including leaves. , stolons, petioles and fruits, fruit infection is not common. The early symptoms are purplish red small spots on the leaflets. As the disease progresses, the small spots expand along the main vein into "V" shaped or circular erosion spots until the margins of the leaves, the edges of the lesions are fuchsia, and the center is yellow to grey. Brown, more obvious ring pattern, dense brown to dark brown spots. Erosion later developed to 1/4 to 1/2 the size of the leaves, causing the leaves to die. This symptom of the leaf is usually not found until close to the harvest of the fruit. The more serious strain is not high in yield, and the plant is not tolerant to cold and is vulnerable to cold in winter. Infected with the diseased leaves, the pathogenicity of Stellera blazei was overwintering in the soil. The overwintering bacteria produced conidiospores for initial infection, spread with air flow, rainwater, and agricultural operations, and invaded many times to spread the disease. Researchers at U.S. Nuclear Research University in the United States recently discovered that the infection of Stellera blazei is associated with air temperature, leaf moisture, and leaf age. The incidence and severity of disease are closely related to the leaf age (leaf growth period). The new leaf stage is highly susceptible to infestation. The second is that the leaf is also very susceptible to infestation when the humidity is high. In particular, the whole plant is submerged in irrigation and wet. During the rainy period, the longer this period, the higher the infection rate. Relative to the leaf humidity and leaf age, the relationship between temperature and disease incidence and disease severity is still relatively small. Second, prevention and control measures 1, agricultural control: (1) close observation during the new leaf period, timely detection and control of the disease, promptly remove the destruction of diseased leaves. (2) Cultivation of disease-free seedlings. (3) After the harvest, the pastoral areas should be cleaned in a timely manner, and the diseased bodies should be concentrated in the fields to be burned and buried to eliminate the overwintering germs. (4) Breeding of good disease-resistant varieties, such as Zhang Jiyi???? 6. Climbing umbrella 13. Picking? / Br> 2. Chemical control: (1) The use of an appropriate amount of bactericide to prevent the long Xinye period. (2) Use 50% carbendazim WP 500 times, incubate for 10-20 minutes before transplanting, dry after transplantation. (3) In the early stage of disease, 80% of Taisheng 600 times or 50% of acetaminophen wettable powder 600-800 times or 70% thiophanate-methyl wettable powder 500 times of spray is used for prevention and treatment. Greenhouse can use 5% chlorothalonil dust agent 1 kg per acre dust control.