For seedlings, under the action of some natural disasters and human factors, seedlings are prone to wounds. It is hot in summer, the bark is easy to be burned, and it is cold in winter, so the trees are easy to suffer from freezing injury. If these wounds are not treated in time, it is easy to cause branches to dry up, and once they are eroded by rain and infected by bacteria, they will also cause branch diseases and lead to tree weakness. So, how to deal with the wound correctly?

First, the characteristics of wound healing

Generally speaking, the faster a tree grows, the stronger its viability, the smaller its wound and the faster its healing speed. When xylem grows most vigorously, the wound heals fastest; The base of the trunk is close to the healthy and vigorous roots, and the healing speed is also fast.

In addition, wound healing is better in spring, summer and winter, and the healing speed is slower in autumn.

■ Wounds formed in spring are the easiest to heal;

■ Wounds formed in summer, and the surrounding bark is easy to die;

■ Autumn wounds are easily infected by rotten bacteria. Rotting diseases are more likely to occur if tree wounds are in alternate wet and dry environmental conditions.

Second, common treatment methods

0 1 clean the wound

Remove the dry bark inside and around the wound to judge the condition of the wound and reduce the hiding place of pests.

When it is necessary to repair or reshape the wound, try not to increase its width to avoid acute angles. To repair the wound, you must use a sharp knife to cut off the upturned bark and flatten the injured xylem to make the healed part more flat. Don't enlarge the wound at will.

Apply a protective agent to the wound surface.

The advantages of wound protectant are sterilization, water retention, wound healing, good internal absorption conductivity, rain erosion resistance, quick response, long duration and strong permeability. It can kill pathogenic bacteria in plants, prevent the spread of diseases through regular application, and has a good therapeutic effect on diseases such as new saw injury and old injury of trees.

When in use, it is directly applied to the wound with a brush or a gray knife. Please stir well before use (the outer edge of the incision should be covered).

Scope of application:

■ Tree pruning or transplanting incision;

■ Wounds caused by pests and diseases;

Restoration and removal of membrane rot of ancient trees.

03 bark restoration

If it is found that the bark is damaged and separated from the xylem, measures should be taken immediately to maintain the humidity of the xylem and bark layers. Carefully remove the torn bark fragments from the wound, cover the wound with bark from the beginning, fix it with a few small nails (coated with antirust paint) or strong waterproof tape, and wrap the wound with wet cloth tape, moss, peat, etc. Avoid direct sunlight.

04 transplanted bark

When the trunk is damaged by tree rings, another piece of bark can be planted to restore the conduction function, or short branches can be grafted to restore the function.

This technique is often used for fruit tree cultivation, but in recent years it has been used for rejuvenation and replanting of ancient and famous trees.

Third, the treatment measures of different wounds

0 1 cuts caused by pruning

It is necessary to apply protective agent in time to help the injured tissue grow rapidly, restore tree vigor, prevent the wound from cracking and pests and diseases, prevent the infection of rotten bacteria, and seal the wound at the same time to prevent pests and diseases from overwintering in it.

02 Trauma caused by natural disasters

It is necessary to spray protective agent or disinfectant on injured trees caused by hail and storm, which can protect wounds, promote wound healing faster, prevent diseases, prevent corrosion and restore the physiological vitality of trees.

03 trunk cortex injury

The trunk cortex is also a fragile part. If protective agents are sprayed on branches and trunks in winter and early spring, protective films can be quickly formed, which can prevent freezing and keep warm, and can also effectively kill overwintering sick eggs.

04 tree hole filling

Some trees will leave some small holes because of diseases or pests, which will not only affect the appearance, but also destroy the tissues that transport nutrients in the trees, resulting in abnormal transport of water and nutrients and endangering the life safety of trees, so it is necessary to fill them in time.

You can dig out the rotten part in the tree hole first, cut off all the rotten tissues, clean them up and disinfect them with disinfectant, and then fill them with cement pebbles according to the ratio of 1:3. Small tree holes can be filled with wooden nails and wedges, or painted with 3 to 4 parts of sawdust mixed asphalt.

Bark rot

If the cortex of the tree is seriously damaged, but there are no rotten branches and trunks, skin grafting can be carried out in April-June. Sterilize the blade with alcohol, scrape the affected part clean and disinfect the wound; Then peel off a circle of good skin with a width of 3-4 cm along the edge of the scar, take a healthy bark from the smooth and thick branches of the same tree species, and stick the bark on the scar. After skin grafting, seal the wound with a plastic film to prevent rainwater from entering.

06 large area laceration

Large-area split wounds are often formed in natural disasters. At this time, it is necessary to clean up the dirt, fallen leaves and other debris in the split wound, then scrape off the bark on both sides of the wound to expose the cambium, then restore the split bark to its original state with posts or hanging ropes, and then tie it tightly with plastic film.