Why should the trees on the roadside be painted white and one tree is red?

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

2, insecticidal, insect-proof. Kill dry insects in overwintering eggs and bark. Because 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.

3. Prevent freezing injury and sunburn, and avoid freezing injury in early spring. 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.

After limewater is applied, because lime is white, it can reflect 40%-70% of sunlight, so the temperature of the trunk has little difference between day and night, and it is not easy to crack. Postpone the germination and flowering period of fruit trees to prevent freezing injury in early spring.

It is convenient to walk at night. When 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.

Extended data:

Common cold protection measures for trees:

1. Irrigation with frozen water: In late autumn, trees should be irrigated with frozen water once before the land freezes. The time to pour ice water is after the first frost and before the light snow.

2. Covering the soil: Before the land is frozen in the middle and late June (5438+065438+ 10), the shrubs with soft branches and short trees will be submerged and covered with soil. Or cover with a layer of dry leaves first, and then cover with 40-50 cm of fine sand to prevent peeling.

3. Roots cultivation: After irrigation with frozen water, the roots of trees should be cultivated with a weir with a diameter of 80 ~ 100 cm and a height of 30 ~ 50 cm to prevent frostbite.

4. Wind barrier: suppose it is in the headwind direction.

5. White spraying and painting: White spraying and painting with lime sulfur powder can reduce the risk of sudden temperature difference, and the sea can kill some overwintering pests and diseases.

6. Spring irrigation: water in time when thawing begins in early spring, keep the land moist at all times, and supply enough water for trees.

7, roll dry, wrapped in grass: newly planted decimal places and wet and cold places in winter, trees that are not cold-resistant, can be rolled dry with straw rope or wrapped with straw trunks and some branches to prevent cold.

8, snow: can maintain a certain low temperature, not affected by supercooling and strong winds, can be humidified in early spring, reduce soil temperature, prevent premature germination of buds, and avoid the harm of late frost.

Baidu encyclopedia-trunk painted white