Strawberry is a luscious berry that is very popular on the market. With the continuous adjustment of the agricultural planting structure, the area planted with strawberries has expanded rapidly, but the disease has gradually increased. The occurrence of the main two diseases of strawberry, gray mold and blight, and pesticide control measures are introduced as follows.
First, gray mold 1, symptoms. The disease is one of the main diseases of strawberries. It can occur in the whole growth period, especially after harvesting. The symptoms of fruit ripening are most obvious. After the leaves are infested, brown spots form, forming a layer of light gray conidia in the case of moisture. After the petiole and the stalk are infected, the lesions become brown around the petiole, and finally the wilting is dry. After the young fruit is infested, it begins to form a single brown spot, which causes the fruit to rot. The pulp tissue becomes soft and watery, losing the aroma and color. In the later stage, the gray part of the disease is divided into spores and conidia. Spores are transmitted to other plants with wind and water and then infested.
2, prevention and treatment methods. (1) Deep trench sorghum, covered with mulch. Generally, the depth of the ditch is 30-40 cm. At the same time, the mulch is placed on the crotch surface to the bottom of the ditch to reduce the contact between the fruit and the soil, speed up drainage and reduce the harm. (2) Add organic fertilizer and apply nitrogen, phosphorus and potassium. Control the amount of nitrogen fertilizer to prevent the length of the plant, and at the same time be rationally close planted, controlled within 8,000 plants per acre to facilitate ventilation and light transmission. (3) Appropriate amount of micro-fertilizer to improve disease resistance. Boric acid, copper sulfate, manganese sulfate, etc. are sprayed at the beginning of the growth of the young leaves and at the bud stage. (4) Clear dead leaves in time in early spring to reduce overwintering bacteria. (5) Chemical control, early prevention, use 50% quick-kling WP or 80% mancozeb WP spray, spray every 7-10 days from the beginning of the bud, spray 3 times.
Second, blight disease 1, symptoms. In the early stage of the disease, the leaves grew slowly, and 1-2 of the 3 leaflets became brown, and the whole plant withered and died. The root canopy, petiole, and stalk vascular bundle of the diseased plant turned brown.
2, prevention and treatment methods. (1) The disease field is subject to a rotation system of more than three years to avoid continuous cropping. (2) Pay attention to field hygiene, and timely remove and burn diseased plants and sick bodies. (3) Soil treatment by solar heat sterilization. The specific method is: after the harvest of strawberry fruit, all the plants in the ground are removed, and then the soil is ploughed, smashed, watered, covered with plastic cloth for about one month, and the temperature of the soil reaches 50 °C by solar energy. .
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