Litchi and longan are both insect- and insect-borne, wind-borne flowers that rely on insects and wind-borne pollination. Artificial pollination is an important measure to increase fruit setting rate in the absence of bee or lack of weather in production. But artificial pollination must pay attention to technology, mainly including pollen collection and pollination methods. First, the collection of pollen (a) Note The time to collect pollen on sunny days. Sunny days pollen development is good, germination rate is high, pollen collected on rainy days, germination rate is low. At the same time, pollen should be collected from varieties with high pollen germination rates. The pollen germination rate of March, Red glutinous rice, Huaizhi, and other varieties is as high as 80%, while the pollen germination rate of Shuidong and Xiaozixiao is only 20%-30%. (B) Pollen collection method 1. Lightly shake the branches to collect pollen and spread plastic film under the tree, gently shake the branches to drop the male flowers or pollen in full bloom, collect the male flowers that have been shaken, and put it in water to stir, soak, filter, and obtain " "Pollen water", and then sprayed on the tree in full bloom of female flowers. Most of the male flowers collected by this method have withered, and most of the pollen loses its vitality. On the other hand, even if there is some fresh pollen, the tannins that are exuded by the flowers inhibit the germination of the pollen because of the long time immersed in the water. Reduced pollination efficiency. 2. Wet a towel with pollen Take a wet towel and pat it in the flowering ears of the male flower. Take 5-6 flower spikes. Then wash it in water. Repeatedly, you can obtain pale yellow pollen water. Sprayed on trees in bloom of female flowers, this method of pollination has high efficiency, best pollen quality and high germination rate. Second, the method of artificial pollination (a) pollination notes Pollinating temperature is preferably 20-25 °C. When the female flowers are in full bloom, sunny days are sprayed from 7:00 to 9:00 in the morning and spray at noon on cold days. Concentration of pollen water is calculated as 100 kg of tree area, 2 g of pure pollen is required, or pollen is added to clean water to stir until the water is light yellow, then filtered and sprayed; 10 g of borax can also be added to 100 kg of pollen water. Stir evenly with the spray. (2) Pollination method The pollen water collected shall be dubbed into pollen water (generally pollen water is suitable for yellowish color) and sprayed on the female flowers in full bloom. This method is mostly adopted on sunny days, so that the stigma can be washed off. The nectar can also maintain a certain humidity on the stigma, which is conducive to fertilization. Pollen water must be sprayed immediately. The whole process of pollination and pollination cannot exceed 20 minutes. Otherwise, the pollen will lose its vitality and affect the pollination effect. 3. Supplementary Measures to Improve Pollination Effect (1) Shake Flowers after Rain to Prevent "Sweet Flowers" Litchi and longan flowers are large and flowers are small and dense. When the flowering season encounters rainy weather, the anthers are difficult to crack, and "flowers bloom" appear. phenomenon. Therefore, after the rain, shake the branches in time to shake off the withered flowers and water droplets on the flower spikes to speed up the flowers to facilitate pollination and fertilization. (b) Spraying water on dry days to prevent "h Flowers" When litchi and longan are exposed to persistent high-temperature and dry weather, the florets secrete more honey and the concentration is greater. Flowers tend to wither and dry, which is not conducive to pollen germination and affect fertilization. To prevent "hhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhh" The best combination of spray pollen water.