Strawberries: Seedlings are the key, and pharmaceuticals need to be used

With the increase in the area of ​​greenhouse strawberry crops in our province, the occurrence of powdery mildew is ahead of schedule, the incidence of disease has increased, and the area has increased, which has caused great losses for strawberry growers. Recently, many farmers called to ask if there is a good solution. The reporter interviewed Sun Zuowen, senior agronomist of the Provincial Plant Protection Station.

"The greenhouse strawberry powdery mildew mainly occurs after the shed, and it mainly infects the leaves at the seedling stage. The flower and fruit mainly infect the flowers and fruits." Sun Zuowen said that at the onset of the disease, sparse white mold layer grows on the back of the leaves, and the condition As a result, the mold layer thickens to form a thick white round spot. In severe cases, the leaves roll up and become infected with petioles, fruit stems, and red-brown lesions on the leaves. The leaf margins are atrophic and dry. When the strawberry enters the flower and fruit stage, the flower changes from white to pink after the disease; the young fruit can't expand normally and is full of wilting; the result of the disease is white with a layer of white hair, the color is slowly uneven, and the fruit loses its luster and hardens and stops growing. Seriously affect the commodity and food value of strawberries.

Sun Zuowen proposed a number of measures for prevention and control: “First, we must select disease-resistant varieties, cultivate robust and sterile strawberry seedlings, and control the occurrence of diseases.” At the same time, organic fertilizers to be applied must be decomposed and the amount of compound fertilizer must be appropriate. Nitrogen fertilizer can not be used too much to prevent burning seedlings and prosperous growth; timely watering, control of soil moisture, greenhouse humidity, to meet the water requirements of the fruit flowering and fruiting period; reasonable planting density can increase the ventilation and light transmittance of greenhouse strawberries; timely removal Old leaves, diseased leaves, diseased fruits.

“For greenhouse strawberries, it is best to use high-temperature stuffy shed technology to eliminate germs in soil and diseased bodies, and to prevent and treat a variety of soil-borne diseases and other diseases of strawberries. Antibacterial agents were actively prophylactically treated with 1106 spores per gram of Pythium oligorum WP 3000 times spray, 2% Wuyimycin water spray 200 times, 4% NR 120 water spray 400 times spray, 75% chlorothalonil The WP can be sprayed 600 times and sprayed once every 7 to 14 days.

After the onset of the disease, Sun Zuowen also put forward specific prevention and control measures: "To use the protection and treatment of the drug control, with 50% of the disulfiram water dispersible granules 3000 times spray, 4% tetrafluroxazole water agent 1000 times spray, 10% difenoconazole water dispersible granules 1500 times spray, 7-10 days spray once, the effect of alternate use of pesticides is better When the greenhouse humidity is high 50 meters 8 meters per square shed with 2% of bacteria 4 pieces of ester smoke, or 20% of chlorothalonil smoke agent, smoked shed, sulfur fumigation fumigation, 99.5% sulphur powder 20 g each time, fumigation 2 hours per day in the prevention period, fumigation 8 hours per day, continuous Use 7-10 times to resume the use of the preventive period; fumigants are more effective when used alternately."

At the same time, Sun Zuowen also reminded the farmers who planted strawberries: "The focus of strawberry powdery mildew is prevention, and the control effect is limited after serious illness. The azole drugs are common drugs used to prevent strawberry powdery mildew in the greenhouse. One dose is too large or multiple doses will be used. Strawberries have an inhibitory effect on growth. Spraying any pesticide must avoid blooming and avoid producing berry and malformed fruit. Frequent use of large amounts of medicament can also cause malformed fruit to contaminate the fruit surface."

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