The weather in Yantai is far away.

1, slightly frozen trees should be sprayed with foliar fertilizer in time. If the leaves turn yellow and curly due to cold dew, wind blowing, morning frost or late spring cold, and the last branch withers or the tree is weak, you can immediately spray Chunyu 1, Happy Forest antifreeze and 0. 1% urea as foliar fertilizer for 2-3 times. Note that the application concentration should be slightly lower than the usual application concentration.

2. Trees with permanently withered branches and leaves should take root first. In case of severe water loss and permanent wilting caused by abnormal low temperature weather or persistent frost, irrigation should be strengthened, intertillage should be used to loosen the soil, and thick straw should be covered on the tree tray. At the same time, the dead leaves are removed or knocked out, and the dead branches at the end of water loss are lightly cut to ensure the balance of water supply between the ground and underground parts, so that the roots are not affected.

3. Pruning after freezing should be carried out in spring buds. It is not advisable to prune sharply immediately after freezing in winter, so as not to aggravate the degree of freezing damage. If the branches are broken due to snow and ice, they should be tied up in time, and posts should be set up or branches should be hung to fix them, so as to keep and save the injured branches as much as possible. Branches that have fallen leaves or dried up due to freezing should generally be postponed until after spring buds, and the principle of "heavy cutting for serious injuries and light cutting for minor injuries" should be adhered to. When pruning, choose sunny weather. Generally, the short section should be cut to about 2 cm below the healthy part. When the main branches and auxiliary branches are sheared or retracted again, reasonable and suitable strong buds should be selected according to the situation of crown and base branches, and the main branches and auxiliary branches should be replanted by sawing them 2 cm above the buds. The incision should be smooth and coated with Kuaihuolin Healing Cream. After the frozen tree is pruned, the new buds germinate in disorder, so it is necessary to sparse the buds and pick the core in time to restore the crown as soon as possible.

4. Prevent pests and diseases after freezing. After freezing, the tree is weak, so it is necessary to apply organic fertilizer in time to prevent waterlogging, drought and insects. Especially after freezing, resin disease (gummosis) is most likely to occur. In mid-May and mid-September, the diseased skin can be scraped off, washed with 75% alcohol, and then coated with Angel Hua Mu bactericide 100 times, and the effect is ideal. In addition, aphids, mites, moths and butterflies should be prevented in time to protect the smooth growth of new branches and facilitate the restoration of crown.