How to prevent and cure strawberry seedling powdery mildew?

What harm does strawberry seedling powdery mildew have? How to prevent and cure strawberry seedling powdery mildew? Do you have any netizens to help introduce that most strawberries are now grown in greenhouses? due to the influence of high temperature and humidity in the greenhouse, strawberry diseases are becoming more and more serious, including powdery mildew. Powdery mildew will generally reduce strawberry production by 10%, more than 50%, or even no harvest, seriously affecting the yield and quality of strawberries. The planting network has sorted out the harm and control methods of strawberry seedling powdery mildew, which are listed in detail below for netizens' reference. Harm of strawberry seedling powdery mildew: powdery mildew only produces disease spots of different sizes on the leaves of strawberry seedlings in the early stage, and then white powdery matter is formed on the back of the leaves, that is, the conidia of the pathogen. With the aggravation of the disease, the white powder covered the whole leaf, the leaf edge rolled up in the shape of a spoon, and the leaf gradually withered and yellowed; for example, when strawberry buds and petals were injured, they could not open or bloom abnormally; when the fruit was damaged, the fruit was covered with white powdery matter, the young fruit lost its luster and hardened, and the green fruit stopped expanding, showing a long and thin shape, and its coloring became poor, which seriously affected the quality of the berry. When strawberry powdery mildew is serious, petiole, flower, pedicel and fruit can all occur except leaves, causing young fruit to stop development and dry up; a layer of white powdery substance is formed on the fruit, which loses edible value; in serious cases, the whole plant dies. Control methods of strawberry seedling powdery mildew: first, select resistant varieties of strawberries, such as Mingbao, Yixiang and other more resistant varieties, and try not to select susceptible varieties such as Fengxiang. Method 2. To avoid seriously ill fields, try to use the fields where cruciferous vegetables and legumes have been rotated to raise seedlings. For example, the fields where Solanaceae crops are planted should not be used as seedling grounds. Method 3. Regulating the temperature and humidity of seedling shed can effectively control the occurrence of powdery mildew. Powdery mildew was the most suitable for the occurrence of powdery mildew when the indoor air relative humidity was high and the temperature was 20 ~ 25 ℃. Method 4. Active prevention with protective fungicides in strawberry seedling stage and early stage, spray with 99% mineral oil 200x liquid plus 1 × 106spores / oligomale Pythium wettable powder 3000 times, or add 2% Wuyisin water agent 200x spray, or add 4% agricultural antibiotic 120x spray, or add 75% chlorothalonil wettable powder 600x spray, spray once every 7 to 14 days, the effect is better. Method 5. After the occurrence of strawberry powdery mildew, the medicament with protective and therapeutic effect should be selected and sprayed with 99% mineral oil 200 times liquid plus 50% ether carbendazol water dispersible granule 3000 times, or 4% tetrafluoroether azole water agent 1000 times spray, or 10% difenoconazole water dispersible granule 1500 times spray, once every 7 to 10 days, the effect of alternating use of the agent is better. Method 6. When the humidity in the greenhouse is high, the 50 m × 8 m shed is fumigated with 4 2% ether fumigant per shed, or 20% chlorothalonil fumigant 4 per shed, sulfur fumigator fumigation with 99.5% sulfur powder 20 grams at a time, fumigation for 2 hours a day during the prevention period, fumigation for 8 hours a day during the disease period, and the prevention period is restored after 7 to 10 times of fumigation. The effect of fumigation is better. Click to get more strawberry planting techniques click to get more fruit planting techniques