Recently, there was a farmer who came to consult with the victim's branch. The leaves of more than 100 jujube trees in her family grew slowly and had many small holes and wrinkled leaves. After careful inspection, it was found that it was caused by the damage of the green tick. It is understood that the family of winter jujube was born 5-6 years old. There are only a few jujube trees on each tree, and the fruit setting rate is very low. I wonder if there is any good method. The author believes that the main reason for the low fruit set rate of her family's winter date is the failure to carry out girdling during flowering, the prevention and control of the green-lipped carp, and the extensive management of the jujube garden. The prevention and control measures are now described as follows:
1. The flowering period should be timely circumcision. After girdling, storing the carbohydrates in the tree in the leaves facilitates fruit setting. In the flowering range of 30%-40%, the average daily temperature reaches 24-26°C. When the weather is fine, the trunks of Zhuang and Wangshu are girdled and opened. It is usually carried out on the trunk 20-30 cm above the ground. After that, it can be gradually 5-10 cm upwards and then circumcision. The girdling width is 1/10 of the diameter of the trunk, typically 0.3-0.8 cm. When the circumcision is selected, the main trunk is smoothed out. The old trunk of the tree trunk is scraped off and then cut with a sharp knife to reach the xylem. However, the xylem is not damaged and only the phloem layer is peeled off. It is required to peel off the knife and incline downward, and the lower knife is inclined upward to form a closed ring, leaving no residue skin and no hair blemishes. Heals 35-40 days after peeling, otherwise the effect is not good. Pay attention to peeling insecticide and pest control, and use paper or plastic film bandage to prevent sun drying or human damage.
2. The spring must pay close attention to the prevention and control of the green-letter cricket. Since the flower buds of winter jujube are formed in the current year and differentiated in the same year, they will differentiate with growth, have a large amount of differentiation, and will have a long differentiation time. Therefore, if the prevention and control of L. lucidum is improper and the damage is severe, the jujube leaves will grow poorly and produce insufficient nutrition. Less flower bud formation, fewer fruit set, low yield.
Control methods: (1) Remove the egg source. In early March, the weeds and litters under the trees were removed, the rough skins at the trunks and branches were scraped off, and the sick and dead branches and dead branches were cut off from the trees and burned in a concentrated manner. (2) Apply glue on the trunk. From mid-March to mid-April, choose a smooth part from the trunk 30-50 cm above the ground. Use rough skin to remove rough skin from the trunk. Stick a tape ring at the smooth end of the trunk. The tape has a width of 3-5 cm. Apply the glue with a brush. Note that it must be applied for a week. There must be no breaks to prevent the insect from climbing up from the fracture. (3) Chemical control. Spray 3-5 Baume degree lime sulfur before germination. Spraying 6% imidacloprid 2000 times + 4.5% beta-cypermethrin 1500 times at the peak of nymphs and adults, the effect is very good, and the control rate can reach more than 90%.
3. Strengthen the management of the jujube garden. (1) Promoting autumn-based basal fertilizers. Autumn basal-fertilizers can increase the storage of nutrients in the tree and meet the needs of budding, long-hanging, flowering and fruit-setting in the coming year. It is not easy to cause phenomena such as excessive blooming of flowers and fruit trees caused by single application of chemical fertilizers. , can greatly improve the rate of fruit set. For the results of the winter jujube tree, do not advocate the application of fast-acting nitrogen fertilizer before flowering, otherwise it will cause excessive nutrition, vegetative growth and reproductive growth imbalance, reduce the rate of fruit set. (2) Foliar spraying. Spraying a gibberellin solution with a concentration of 0.001%-0.0015% once at full bloom, or spraying with 0.3% urea solution and 0.2%-0.3% borax, can effectively increase the fruit setting rate. (3) The bees are released during flowering. Putting a box of bees on 8-10 mu is beneficial to pollination.
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