Key points of Scientific Management Technology of Litchi in May

The rainy weather in May will bring difficulties to the management of litchi. Therefore, in view of the early and middle maturity varieties, the following management suggestions are put forward for the majority of fruit farmers' reference. Early-maturing varieties, such as March Red, are entering the coloring period at this time, focusing on the control of litchi stem borer and litchi downy blight, and the use of low-toxic and efficient pesticides to improve quality. The mixture of 1500-fold solution and 4000-fold solution can be used to control litchi stem borer. For litchi downy mildew, prevention should be given priority to. 2000 uniform spray can be used before there is no disease, or Anke manganese zinc can be sprayed once before and after the heavy rain, because the fruit has drooped at this time, so the spray must be careful. Spray around the fruit and on both sides of the leaves. Timely application of pre-harvest fertilizer, mainly organic fertilizer. Pay attention to drainage and waterlogging to prevent fruit cracking. Middle-ripe varieties, such as Feizixiao, black leaves, white sugar, etc., will enter the water division period, tile fruit stage and the second physiological fruit drop stage, with emphasis on the control of litchi stem borer, Pentatoms, small gray butterfly and litchi downy mildew. High-efficiency Baike + dimethoate + trichlorfon can be used to spray alternately. 2000 spray protection was used before the onset of the disease, and Anke manganese zinc, plague cream manganese zinc and ethyl phosphorus aluminum were sprayed in turn at the initial stage of the occurrence of Phytophthora for 3-4 times in a row. Because at this time is the physiological fruit drop period, should also spray a fruit and vegetable enhanced Yunda-120, fully mobilize the positive factors of the tree to protect the fruit. Mow the grass in time to avoid excessive humidity in the orchard and make the germs more susceptible to infection. For ring-cutting trees that protect flowers and fruits, it is necessary to often check whether the ring cut is healed, and the healed trees should be recut in time to avoid fruit drop caused by the return of a large amount of nutrients to the roots. Cut off the branches of diseases and insect pests in time, make the crown transparent, receive light evenly, and reduce diseases and insect pests. Late-maturing varieties, such as Nuomici, Guiwei, Huaizhi, etc. are in the first physiological fruit drop period, at this time should focus on spraying regulators and foliar fertilizer, while spraying low concentration of insecticides and fungicides, can be used Yunda-120 + + methyl topzine + 0.1% high-quality urea + 0.2% potassium dihydrogen phosphate fruit spray, 2 times in a row.