How to protect flowers and fruits of litchi?

How to protect flowers and fruits of litchi? What are the ways to make litchi fruitful? Also ask experienced netizens to help introduce the method of litchi if you want to get a good yield, you need to do a good job of flower and fruit protection of litchi, so the land network has sorted out the management methods of flower and fruit protection of litchi, which are listed in detail below for netizens' reference. First, the method of strong flower and flower protection of litchi 1. Apply strong flower fertilizer to litchi in time: strong flower fertilizer is generally applied when the flower ear of litchi sees the flower bud (also known as fertilization when seeing the flower). The amount of fertilizer application depends on the amount of flowers and litchi tree potential, generally for every 50 kg of tree surface, 1 kg of compound fertilizer plus 0.2 kg of urea, or 0.5 kg of urea, calcium superphosphate and potassium chloride. In addition, spraying 0.3% potassium dihydrogen phosphate on leaves about 20 days before flowering, or Luwang 1 (high potassium) 1000 times plus 0.05% borax, can promote flower ear development. 2. Reasonable control of litchi flower ear: through the experiments in previous years, it is generally found that the flower quality of early flower ear and over-long flower ear is poor, the proportion of female flower is small, and the fruit setting rate is low, especially for the varieties with large flower ear (such as Feizixiao). It is necessary to reasonably adjust and control the flower quantity and flower quantity in order to improve the fruit setting rate. Method 1. Artificial truncation of spikes: cutting short spikes can reduce the number of flowers and improve the quality of flowers. The weight of the short spike depends on the variety, and the varieties that have strong ability to regenerate and are easy to draw secondary spikes, such as Feizixiao and March Red, can be heavier. Method 2. The drugs used for panicle control are litchi high yield hormone, ethephon and so on. Method 3. Control of diseases and insect pests. The main diseases and pests harmful to litchi flower and ear are litchi bugs, litchi gall mites, inchworm, aphids and litchi downy Phytophthora. It can be controlled by Lexben, propargite, imidacloprid, methamphetamine, trichlorfon, aphid like, Ruidu manganic zinc, disinfectant alum, Dasheng Mrel 45, metalaxyl and other drugs. 2. Key points in the management of litchi flowering period 1. Release bees for pollination. It is generally required to keep a box of bees every 3 to 5 mu. Point 2, artificial assisted pollination, the commonly used method of artificial assisted pollination is to gently shake back and forth on the newly opened male flower ear with a wet towel, collect pollen, and then place the towel in clean water for many times to make the pollen suspension a yellowish turbid liquid, that is, spray it on the female flower. Matters needing attention for artificial pollination: first, the sunny day with the temperature above 16 ℃ should be selected; second, the pollen liquid should not be placed for more than 20 minutes, otherwise the pollen will lose its vitality and affect the pollination effect. Point 3. Spray water to prevent flowers from falling in dry days. Point 4. Shake trees to prevent retting flowers in rainy days. Third, litchi fruit protection method 1, fertilize strong fruit and protect fruit, because litchi flowering consumes a lot of nutrients, in order to ensure the nutrients needed for fruit growth and development, it is necessary to apply strong fruit fertilizer in time from flowering to young fruit and mung bean. The amount of fertilizer application should be determined according to the tree potential and fruit, at the same time, attention should be paid to extra-root topdressing. Method 2. The method of ring cutting and fruit protection was used to cut the strong and vigorous trees. The female flowers began to be cut 10-15 days after flowering, and the cutting was carried out on a big branch with a diameter of 4-6 cm, cutting once to the xylem. The weak tree is not cut. (3) using plant growth regulator to protect fruit. Use 20 mg / L gibberellin to protect the fruit when the fruit is big. Method 3. Strengthen the water management of litchi to protect fruit, irrigate when drought, spray water on tree crown when high temperature and strong sunshine, and drain water in time when there is much water in rain. Method 4. Timely prevention and control of diseases and insect pests to protect fruit. The main diseases in litchi fruit development period are litchi downy blight, litchi soot, litchi anthracnose, and the main pests are litchi stem borer, litchi bugs, litchi small gray butterfly and so on. Emphasis should be placed on the prevention and control of diseases and insect pests in the young fruit stage of litchi. Control methods of Fruit cracking in Feizixiao Litchi Management methods of Litchi after picking