With the increase in the area of ​​strawberry replantation in greenhouses, the incidence of powdery mildew is ahead of schedule, and the incidence of disease increases and the area of ​​occurrence increases. Strawberry powdery mildew occurred mainly in the greenhouse after the shed, which mainly invaded the leaves at the seedling stage, and flower and fruit were mainly infected in the flower and fruit stage. In the early stage of disease, there is a sparse white mold layer on the back of the leaves. As the disease progresses, the mold layer becomes thicker and forms thicker white round spots. In severe cases, the leaves roll up and become infected with petioles, fruit stems, and leaves with reddish-brown lesions and leaf margin atrophy. Dry. After January, when strawberries entered the flower and fruit stage, the flower changed from white to pink. After the disease, the young fruit can't grow normally and dry and wilting. The result is a layer of white hair, slow coloration, and fruit loss. Hardening stops growth; it seriously affects the commodity and food value of strawberries. Therefore, the following measures must be taken in the prevention and control: Select disease-resistant varieties, cultivate robust and sterile strawberry seedlings, and control the origin of the disease. Application of organic fertilizer to maturity, compound fertilizer to be appropriate, in particular nitrogen fertilizer can not be used too much to prevent burning seedlings and prosperous; timely watering, control of soil moisture, greenhouse humidity, to meet the water requirement of the fruit flowering period; reasonable cultivation Density can increase the ventilation and light transmittance of greenhouse strawberries; timely removal of old leaves, diseased leaves, and diseased fruits. The use of high-temperature stuffy greenhouse technology in greenhouse strawberry continuous cropping can eliminate bacteria in soil and diseased bodies, and can comprehensively prevent and treat various soil-borne diseases and other diseases of strawberries. In the production of susceptible varieties such as Hong Yan, Hong Xia, etc., in the absence of disease before flowering with a protective fungicide for active prevention, with 1106 spores / g oligo-androgen wettable powder 3000 times spray, 2% Wuyimycin Aqueous 200 times spray, 4% Agri 120 water spray 400 times spray, 75% chlorothalonil wettable powder spray 600 times, sprayed once 7-14 days, better use of alternate agents. After the onset of the disease, it should be controlled by the use of agents with protection and treatment effects. It should be sprayed with 50% carbendazim water dispersible granules 3000 times, 4% tetrafluoroether azole water solution 1000 times, and 10% difenoconazole water dispersible granules. 1500 times spray, spray once 7-10 days, the effect of alternate use of agents is better. When the greenhouse humidity is high, a greenhouse of 50 meters and 8 meters in each shed is used to smoke 4 sheds of 2% ethericides or 20% chlorothalonil smokers. Sulfur fumigation device fumigation, each with 99.5% sulfur powder 20 grams, fumigation every 2 hours during the prevention period, the onset of fumigation every day for 8 hours, 7-10 times after continuous use to prevent the use of methods of recovery; fumigant alternate use of better. Issues requiring special attention: The focus of strawberry powdery mildew is prevention, and the control effect is limited after severe illness. The azole drugs are commonly used in the prevention and treatment of strawberry powdery mildew in the greenhouse. A large dose or multiple doses of the drug may inhibit the growth of the strawberry. Spraying any medication must avoid blooming and avoid producing berries and malformed fruits. Frequent and extensive use of pharmaceuticals can also cause malformed fruit to contaminate the fruit surface.
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