From the fruit harvest until the autumn shoots turn green and mature, the tip period generally lasts for 4 to 6 months, pumping 2 to 3 new shoots, and providing the result for the coming year. Therefore, the robustness of the new shoots, especially the autumn shoots, will directly determine the outcome of the next year's flowering. At this time, most of the pests are harmed by the leaf. If the prevention is improper, it is often eaten all the young leaves overnight, which has a great impact on the flowering results in the coming year.
Agricultural control
1 reasonable layout. The tree and the tree should be kept at an appropriate distance, and 20 to 25 trees per acre should be planted.
2 unified shoot. After the fruit is harvested, it will be retracted and short-cut in time, so that the new shoots of the whole park will be in the same period, and the shaded branches of the canopy will be cut off.
3 keep the grass properly. Remove the weeds under the canopy, and keep the weeds between the trees and the trees, especially the compositae weeds. When staying in the grass, the grass should not be too high (about 20 cm), providing transitional food and habitat for natural enemies.
4 painted white trunks. In the winter clearing, 15 parts of quicklime, 30 parts of water, 1 part of salt, 2 parts of adhesive (such as clay, oil, etc.), 2 parts of stone sulphur solution, and white liquid, from the base of the stem to 0.8-1.0 In addition to whitening.
5 robust trees. Strengthen the management of fertilizer and water, apply more organic fertilizer, and improve the resistance of the tree.
2. Physical control
1 hang a trap light to trap the adult. The number of traps is 10 mu/piece. When there are conditions, the number of traps can be increased appropriately. It is better to see the lights when the person is standing in the middle, forward and left. This measure has a good control effect on lepidopteran pests such as litchi and moth.
2 use food traps. Mix the sugar, vinegar and wine in a 1:1:1 ratio, add the mixture to the triangular trap, and hang the trap in the canopy, 1.5 to 2.0 meters from the ground, and 10 to 15 per acre. Add a sweet and sour wine mixture for 2 weeks.
3. Biological control
Use biological pesticides for a short period of time. When the new one is taken out 1 to 2 cm, the sprayed Bacillus thuringiensis (Bt) preparation is applied at a dosage of 2.0×109 international units per mu, and plant-derived pesticides such as azadirachtin, tarthonin, ligustrazine, rotenone and matrine can also be used. Dilution of 500 times spray, the control effect of Litchi moth and leaf roller moth is more significant.
4. Chemical control
1 After entering the winter, implement the Qingyuan. Spray once with 48% chlorpyrifos and 5% beta-cypermethrin 1000 times.
2 After convulsions, about 7 to 10 days before flowering, use crystal trichlorfon (97% trichlorfon) and 5% beta-cypermethrin 1000 times solution to spray the canopy branches and flower spikes.
3 Before and after the Ching Ming Festival, the result of the lychee Xiehua, after the bee was recovered, sprayed 10% triazophos and 5% kungfu 1000 times solution on the canopy branches and flower spikes.
4 When the summer shoots are taken, the young leaves are to be 2 to 3 cm long, sprayed once, using 48% chlorpyrifos or 5% beta-cypermethrin 1000 times solution and 1.8% avermectin 500 times solution or 5% chlorella Benzoic acid 1000 times liquid spray.
5 When the autumn shoots are taken, the young leaves are about 2 to 3 cm long, 5% beta-cypermethrin 1000 times solution and 1.8% avermectin 500 times solution spray, spray once every 7 days, spray 2 times.
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