With the arrival of autumn, the temperature has dropped, the rain has increased, and the light is insufficient. Snake disease in some strawberry-producing areas has started to occur frequently, and some fields have reached more than 50%, which has seriously affected the growth of strawberries. The main prevention and control technologies will now be introduced as follows:
First, the symptoms of disease:
The main damage leaves. More from the bottom of the old leaf began to develop, and gradually develop upward. In the early stage of onset, many small and almost round, purple-red spots of varying sizes appear on the leaves, resembling snake-eyes. After that, the central spot turned gray to gray-brown and formed large spots, sometimes with purple-red circles. When the humidity is high, a white powdery mildew layer is formed on the surface of the lesion, that is, the pathogenic conidiophore and conidia. Later in the lesion can produce a lot of small black spots, that is, bacteria capsule seat. In severe cases, the lesions on the leaves are densely covered, and the diseased leaves become necrotic and dehydrated in a short time.
Second, the characteristics of the disease:
The disease is particularly prone to occur in the fields where strawberries are grown for many years. The germ development temperature is 7 to 25°C and 18 to 22°C is the most suitable. There is a slight difference in the degree of disease among the varieties, which generally occurs in the seedling stage, and mainly damage the leaves and petioles. The early stages resemble snake eyes. Severe onset of lesions and a large lesion until the leaves are completely dead.
Third, control methods
1. First, a comprehensive prevention and control method must be adopted, because the pathogenic bacteria are overwintering with the mycelium, so as much as possible, the same piece of land is not planted in the same place. Usually, the plants are planted alternately for 2-3 years, and the plant must be protected against disease. .
2. To reduce the groundwater level, the field should be well drained, ventilation and ventilation, which can effectively reduce the incidence; early prevention, early control, can play a multiplier role, can greatly reduce the cost of pesticide control.
3. Strictly remove diseased seedlings during transplantation. Before transplanting, seedlings should be immersed in the solution of the pesticide in the counter-mouth, and should be planted after drying; the diseased leaves should be removed timely and taken out of the field for proper treatment to prevent the diseased leaves from infecting healthy plants.
4. In the early stage of disease prevention and treatment, the current effective pesticide has a broad-spectrum therapeutic fungicide 25% Kairun EC, which can treat and eradicate the disease, and is generally used twice; it can also use 60% Baitai dispersible granules 1500 times. Use carbendazim or thiophanate-methyl for prevention and treatment; the key to disease prevention is prevention. 60% Baitai dispersible granules can be prevented at the seedling stage, once every 7-10 days, can effectively control the occurrence of a variety of diseases; also can be used mancozeb, thiophanate-methyl, carbendazim in the seedlings Spraying prevention and control, if you add a package (2g) of Shufeng-481 natural brassin to each hand-negative sprayer in the pesticide solution, you can quickly promote plant growth and restore the disease on the plant.
At the beginning of the disease, spray 30% of green suspension solution 400 times, 14% of ammonia solution 300 times, 77% can kill WP 500 times, 75% chlorothalonil powder 500 times, 70% generation. Manganese zinc wettable powder 350 times sprayed cloth. Once in 10 days, a total of 2-3 times. The drug was stopped 3 days before harvest.

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