How to manage persimmon orchards in summer

The summer management of persimmon orchard should pay attention to the following points: first, fruit sparse and astringent persimmon from mid-May to early June, sweet persimmon from early June to early July, after the end of physiological fruit drop, according to the proportion of 20: 25 leaves to keep strong young fruits free of diseases and insect pests, the fruits to be removed are deformed fruits, diseases and insect pests, fruits on branches less than 15 cm in length or less than 5 leaves, fruit on the base of fruiting branches and fruits on branches. 2. Annular peeling for adult fruit trees, an annular peeling was carried out in the middle and last ten days of May. The method is to cut a band 2mm 3mm wide on the trunk ring with a sharp knife and gently cut it longitudinally with the tip of the knife without harming the xylem, and then gently pick up and peel off the narrow bark with the tip of the knife. The purpose of annular peeling is to prevent carbohydrates produced by persimmon leaves during photosynthesis from being transported to the roots in order to strengthen the fruit. 3. Weeding and irrigation in the middle ploughing according to the growth of weeds, weeding in the middle ploughing for 2 times, and persisting in shallow hoeing 7 cm under the canopy and 25 cm deep hoe outside the canopy. When there is a drought from July to August, it is necessary to irrigate and fight drought in time. Where there is no intercropping persimmon garden should be fully covered with grass, can preserve soil moisture and fertilizer, prevent weeds and cold, sunburn, improve the soil, but dry weather should pay attention to fire prevention. Fourth, topdressing is the peak season for persimmon growth from May to June, and the root and shoot growth ability is strong. For 1-year-old and 2-year-old young trees, the amount of fertilizer applied per plant is 20 grams of pure nitrogen, 10 grams of calcium superphosphate and 20 grams of potassium chloride. The amount of fertilizer applied per plant of 5 years old was twice as much as that of 1 ~ 2 years old. The amount of fertilizer applied per mu of adult fruit trees is 4 kg of pure nitrogen (7.8 kg of urea), 4 kg of calcium superphosphate and 4 kg of potassium chloride. Outside the vertical drip line of the crown, 5 cm to 10 cm of the young tree and 15 cm to 20 cm of the adult fruit tree, dig a circular trench with a width of 20 cm and a depth of 20 cm. Generally choose in cloudy or sunny days before 9: 00 in the morning, after 5: 00 in the afternoon, apply the above three kinds of fertilizer, and then fill the soil to cover. The main diseases and insect pests in persimmon orchard are round spot, angular spot, anthrax and powdery mildew. These diseases can be sprayed with 0.3: 0.5 pomethyl sulphur mixture or 50% topazine powder 800-1500 times spray, or 1-100 Bordeaux liquid spray. The main pests are persimmon caterpillar, beetle, persimmon stem worm, blood spot leafhopper, persimmon shoot moth and so on. 40% omethoate 500 × 1000 times liquid or 50% potassium ammonium phosphorus 1000 times solution can be used for spray control. The diamondback moth can be controlled by spraying 600-800 times liquid of crystal dipterex.