Prevention and treatment of Snake Eye Disease of growing Strawberry

With the arrival of autumn, the temperature dropped, Rain Water increased and the light was insufficient. Snake eye disease began to occur frequently in some strawberry producing areas, and the incidence of some fields reached more than 50%, which has seriously affected the growth of strawberries. The main prevention and control techniques are introduced as follows:

First, the symptoms of the disease are mainly harmful to leaves. Most of them began to develop from the lower old leaves and gradually developed upward. At the initial stage of the disease, there are many small round and purplish red spots on the leaves of different sizes, similar to snake eyes. Later, the central spot changes from grayish white to grayish brown and forms large spots, sometimes with purplish red wheels. When the humidity is high, the white powdery mildew layer is produced on the surface of the disease spot, that is, the pathogen conidiophores and conidia. In the later stage, many small black spots can be produced on the disease spot, that is, the ascomycete. When it is serious, the disease spot is densely spread on the leaf, and the diseased leaf is necrotic and scorched in a short time. 2. The characteristics of the disease: the disease easily occurs in the fields where strawberries have been planted for many years. The development temperature of the pathogen is 7: 25 ℃, and the most suitable temperature is 18: 22 ℃. There were slight differences in the degree of disease among varieties, which generally occurred in the seedling stage, mainly damaging leaves and petioles. At the initial stage of the disease, it is very similar to snake eyes. When the disease was serious, the disease spot became a large disease spot, until the leaf withered completely. Third, control methods 1. First of all, the method of comprehensive control must be adopted, because the pathogen overwinters with mycelium, so strawberries are not planted continuously in the same field as far as possible. Generally, strawberries should be planted once every 2-3 years, and should be prevented without disease. 2. Lowering the groundwater level, good drainage, ventilation and ventilation in the field can effectively reduce the incidence of the disease; early prevention and early control can get twice the result with half the effort and greatly reduce the cost of pesticide control. 3. When transplanting, the diseased seedlings should be removed strictly. Soak the seedlings with corresponding pesticide solution before transplanting, wait for drying and then plant; at the initial stage of the disease, remove the diseased leaves and take them out of the field for proper treatment to prevent the diseased leaves from infecting healthy plants repeatedly. 4. Medication and control at the initial stage of the disease, the current effective pesticides are 25% Kailun EC, a broad-spectrum therapeutic fungicide, which can treat and eradicate the disease, which is generally used twice; 60% Baitai dispersible granules 1500 times mixed with carbendazim or methyl topiramate can also be used for prevention and control; the key to disease prevention is prevention. 60% Baitai dispersible granules can be prevented at the seedling stage and can be used every 7-10 days to effectively control the occurrence of a variety of diseases; mancozeb, methyl thiophanate and carbendazim can also be sprayed at the seedling stage. If you add a pack (2 grams) of Shuofeng-481 natural brassine to each back manual sprayer in the pesticide solution, it can quickly promote plant growth and restore the effects of diseases on plants. At the initial stage of the disease, 30% Ludebao suspension was sprayed 400 times, 14% ammonia copper solution 300 times, 77% killing wettable powder 500 times, 75% chlorothalonil 500 times, 70% mancozeb 350 times. Once every 10 days, 2-3 times in total. Stop using medicine 3 days before harvest.