Detailed Explanation of Key Points for Scientific Management of Lychee in May
Rainy weather in May will bring difficulties to lychee management. Therefore, for early and mid-season varieties, the following management suggestions are proposed for the reference of fruit growers. Early-maturing varieties, such as Sanyuehong, are now entering the coloring stage. The focus is on controlling the lychee fruit borer and lychee downy blight. Low-toxicity and high-efficiency pesticides should be used to help...
Rainy weather in May will bring difficulties to lychee management. Therefore, for early and mid-season varieties, the following management suggestions are proposed for the reference of fruit growers.
Early-maturing varieties, such as Sanyuehong, are now entering the coloring stage. The focus is on controlling the lychee fruit borer and lychee downy blight. Low-toxicity and high-efficiency pesticides should be used to help improve quality. To control the lychee fruit borer, a mixture of Chujin 1500-fold solution + Gaoxiaomiebaike 4000-fold solution can be used to kill both insects and eggs. For lychee downy blight, prevention should be the main approach. Before disease onset, spray evenly with Keshande 2000, or spray Anke Mancozeb once before and after heavy rain. Because the fruit has already drooped at this time, causing fruit to overlap fruit, spraying must be done carefully so that the area around the fruit and both sides of the leaves are covered. Apply pre-harvest fertilizer in a timely manner, mainly organic fertilizer. Pay attention to drainage and flood prevention to prevent fruit cracking.
Mid-maturing varieties, such as Feizixiao, Heiye, Baitangying, etc., will enter the water-splitting stage, tile fruit stage, and second physiological fruit drop stage. The focus is on controlling the lychee fruit borer, stink bug, small gray butterfly, and lychee downy blight. Gaoxiaomiebaike + dimethoate + trichlorfon can be used in alternating sprays. Before disease onset, spray Keshande 2000 for protection. In the early stage of downy blight, spray Anke Mancozeb, Yishuang Mancozeb, phosethyl-Al, etc. in rotation, for 3-4 consecutive times. Because this is the physiological fruit drop stage, spray once with fruit-and-vegetable enhanced Yunda-120 to fully mobilize the positive factors of the tree body to protect the fruit. Cut grass in a timely manner to avoid excessive orchard humidity, which makes it easier for pathogens to infect. For trees that have been ring-cut to protect flowers and fruit, frequently check whether the ring-cut wounds have healed. Trees that have healed should be re-cut in a timely manner to avoid large amounts of nutrients flowing back to the root system and causing fruit drop. Prune diseased and pest-infested branches in a timely manner to make the canopy well-ventilated and evenly lit, reducing diseases and pests.
Late-maturing varieties, such as Nuomici, Guiwei, Huaizhi, etc., are in the first physiological fruit drop stage. At this time, the focus should be on spraying regulators and foliar fertilizers, while also spraying low-concentration insecticides and fungicides. Yunda-120 + Chujin + thiophanate-methyl + 0.1% high-quality urea + 0.2% potassium dihydrogen phosphate can be used to spray the fruit, for 2 consecutive times.