You can apply whitening agent to the toona tree.

The functions and precautions of whitening tree trunks:

1. The function of whitening agent

1. Killing germs

Apply The quicklime and salt components in the whitening agent have the effect of sterilization and disinfection, which can eliminate various types of bacteria that overwinter at the base of the trunk. After whitening, it can also accelerate wound healing.

2. Kill insect eggs

Many insect eggs like to overwinter in the cracks of tree bark and inside the bark of tree trunks, as well as borers such as beetles. Painting them white can effectively eliminate these eggs. Lose.

3. Pest control

Pests that harm trees generally like dark and dirty places and do not like white and clean places. After the trunk is painted with whitening agent, the pests will not dare to Hazard by climbing up the tree trunk.

4. Prevent nibbling

The whitening agent contains unpalatable ingredients such as lime and sulfur, which can prevent pikas from nibbling tree bark in winter;

5. Prevent freezing damage

From the beginning of winter to the beginning of spring the next year, the temperature difference between day and night is large. In winter, the trunks are dark brown and easy to absorb heat, causing the sunny bark to have a large temperature difference between day and night and easily freeze and crack. Especially large trees, because their trunks are thick, dark in color, and their tissue toughness is relatively poor, they are more likely to crack.

By painting it white, sufficient sunlight and ultraviolet rays can be reflected out during the day, reducing the temperature difference between day and night at the base of the trunk and avoiding freezing damage. Because the temperature at the base of the trunk of white-painted trees accumulates slowly, the budding and flowering periods of the trees are often delayed, and they can avoid frost damage caused by "late spring cold".

6. Prevent sunburn

After the tree trunks are painted white, they can reflect the bright sunlight and ultraviolet rays during the day, which can effectively reduce the occurrence of sunburn hazards.

7. Increase driving safety at night

Because white has a good reflective effect at night, it allows pedestrians and vehicles to see the road more clearly at night, reducing certain safety concerns. Hidden danger.

2. Precautions for whitening tree trunks

The whitening agent is generally used between early October and mid-November. It cannot be delayed. Too low temperature will cause it to fall off.

Generally speaking, there are special products for whitening agent on the market. If it is economical, we can also prepare it ourselves. There are many preparation methods. Let us introduce a method for preparing whitening agent: 0.25 kg of lime sulfur solution, 0.254 kg of salt, 1.5 kg of quicklime, appropriate amount of oil and fat, and 5 kg of water. When preparing, add water to quicklime to mature, add oil, stir and add water to make lime milk, then pour in the lime sulfur mixture original solution and salt water, stir thoroughly and it is ready.

What kind of whitening agent we choose depends on our main purpose, but basically the functions are similar. However, when choosing to prepare your own whitening agent, you must pay attention to using it as you go and not leaving it for a long time. When applying whitening, you must clean up the warped skin, handle the branches, apply it in time, and apply it evenly.

The height of white painting depends on the size of the tree, usually 0.6-1.2 meters from the ground is appropriate. If an old tree has been exposed and regenerated, in order to prevent it from being exposed to the sun, the whitening position should be raised, or the entire tree should be painted white. Generally, whitening agents are alkaline substances. Be careful when mixing pesticides, fungicides and repellents. You need to choose fungicides, insecticides and repellents that can be mixed with alkaline pesticides.

3. Reasons why trees are painted white

1. Sterilize, prevent bacterial infection, and accelerate wound healing.

2. Pesticide and insect control. Kills overwintering insect eggs and stem-boring insects in the bark. Pests generally like black, dirty places and do not like white, clean places. The trunk is coated with snow-white lime water, which prevents pests in the soil from climbing up the trunk to cause trouble. It also prevents the bark from being bitten by animals.

3. Prevent freezing damage and sunburn, and avoid early spring frost damage. In winter, the temperature is very low at night; during the day, the temperature rises due to sunlight, and the trunk is dark brown, which is easy to absorb heat, and the temperature of the trunk rises quickly. This kind of cold and hot weather makes the tree trunks easy to freeze and crack.

4. It is convenient for walking at night. After the trees are painted white, they will reflect light. Pedestrians at night can see the road more clearly and beautify it, giving people a very neat feeling.