Detailed Explanation of Key Techniques for Autumn Management of Longan

Longan autumn shoot growth promotion period. Because growing regions differ, longan growth states also differ. When the first new flush has just emerged, good autumn shoots should be cultivated according to variety characteristics and the conditions of each orchard.

① Spray pesticide to protect new shoots. Currently, pests harming longan new shoots include the longan psyllid, lychee erineum mite, longan shoot borer, etc. Spray pesticide for control when new shoots have just sprouted.

② Fertilize to promote and strengthen shoots. Longan bears relatively many fruits, nutrient consumption is high, and tree reserves decrease, affecting the quality of the first new flush. In addition to applying compound fertilizer, organic fertilizer and quick-acting nitrogen fertilizer to the soil, agricultural nucleotides or other foliar fertilizers should also be sprayed during new shoot growth.

③ Drain or irrigate promptly. After rain, when water accumulates in the orchard, it should be drained promptly, especially in orchards with relatively heavy clay soil. During drought, irrigate promptly; lack of water not only delays new shoot emergence but also affects new shoot growth.

④ In orchards where new shoots emerge only in late August or early September, management should be strengthened by spraying agricultural nucleotides + 0.1%-0.2% nitrogen fertilizer to promote new shoot growth, striving to have the last autumn shoots emerge in late October.

⑤ Thin branches. When the leaves of the first new flush turn green, branch thinning can be carried out, mainly removing excess new branches emerging from pruning cuts. Generally, 2-3 new shoots are retained on pruned branches, and the remaining new shoots are thinned to the extent that the trunk and branches are not directly exposed to sunlight. In some orchards that have been pruned too heavily, new shoots on the trunk should be appropriately retained; only with a certain amount of branch growth in the canopy can air humidity be maintained and sunscald be prevented.