Why paint big trees white in winter?

In winter, the temperature is very low at night; During the day, due to sunlight, the temperature rises, the trunk is dark brown, which is easy to absorb heat, and the temperature of the trunk also rises rapidly. This makes the trunk easy to freeze and crack. Especially for big trees, the trunk is thick, the color is dark, the tissue toughness is poor, and it is easier to crack.

Pests generally prefer black and dirty places to white and clean places. When the trunk is coated with snow-white limewater, the pests in the soil will not dare to climb up the tree along the trunk to make trouble, and the bark will be prevented from being bitten by animals.

Extended data

White agent for trunk and white variety

Trunk whitening agent is made by adding water to quicklime, adding oil and stirring, adding water to make lime milk, then pouring the original solution of stone sulfur mixture and salt water, and fully stirring. The production of tree trunk brightener will directly use the residue produced by stone sulfur mixture.

At present, some manufacturers produce powdery whitening agents, which have specific functions to increase the effect of killing borers, and the main components are similar to paints. Compared with the traditional whitening agent, the whitening agent produced by this factory is more convenient to use and more conducive to storage.

In view of the occurrence of diseases and insect pests, the evergreen trees in Sophora japonica, Ulmus pumila, Lagerstroemia indica, Albizia Albizia, Populus euphratica, Luan, Liu, Cherry Blossom and Rosaceae, as well as some trees harmed by scale insects, Cerambycidae and aphids, as well as trees susceptible to freezing injury, such as Du Ying and Michelia, can be painted emphatically, while other trees less harmed by diseases and insect pests, such as Metasequoia glyptostroboides.

Baidu encyclopedia-whitening trunk

Baidu encyclopedia-trunk whitening agent