In March, when it’s still quite cold, thanks to direct sunlight, the tree bark can warm up to +15 degrees. Frosts strike again at night, and as a result, sunburn of trees occurs. The heating of the trunk is enhanced by white snow, from which rays are also reflected. As a result, the situation is quite extreme.
Consequences of burns
Where there is a sunburn, the bark of the tree darkens. Over time, the stain increases. The bark is peeling and cracking. Then it simply falls away, exposing the wood.
Naked tissues are more prone to fungal infections.
Among other things, sunburns cause a number of problems:
- plant life is reduced;
- water and nutrients go poorly;
- winter hardiness worsens;
- yields are getting lower.
If the formed wounds are not cured in time, they will be damaged again in the summer. The risk group includes those trees whose leaves are sick with something. In view of this, it is important that the leaves are healthy, as they realize a thermoregulatory function.
There are several ways to protect trees from this type of burns. Usually produce whitewashing with lime or tie the trunks with a white cloth.
Presented color reflects the sun's rays.
Whitewashing is carried out in autumn or winter, but always at a plus temperature.
How to prepare a lime solution?
- Take 3 kg of freshly slaked lime.
- A pound of vitriol, previously diluted in hot water, is added.
- Next, 100 g of casein glue is added.
- The whole mixture is diluted with water to the extent that it does not acquire the consistency of sour cream.
Before whitewashing from the tree, snow is scooped up, and after the work is done, the trunk is again sprinkled with snow. So the roots of the plant will be protected from frost. In April and May there is no point in producing whitewashing.
You can also use parchment white paper. Some gardeners use planks that are nailed onto 35 mm nails on the south side of the trunk.
The presented type of protection is able to serve effectively for 5 years.
If you have enough experience, you can vaccinate varieties that suffer from burns in the crown.
The best option is the use of special synthetic paints and ready-made mixtures:
In the event that the trunks of trees were already strapped with spruce branches, then whitewashing is not necessary.
advises you to read the article - “Five tips to protect against frost.”
How to protect trees and shrubs from sunburn in winter
How to prevent burns
There are many ways by which you can protect trees from sunburn.
- It is important to maintain the soil in a loose state. Organic mulch will help you.
- It is worth paying attention to leaf health. To do this, pest control must be done in a timely manner.
- Plant garden trees in the hills. At the same time, the soil can lose moisture, and in order to prevent this, mulching by a film is realized.
- Do not peel off the exfoliated bark in winter, it is worth doing the work presented only in the summer.
- A special support is installed, painted white. The shadow from it should fall on the seedling. The support should be removed after a few years.
You might also be interested in the article “Winter Gardening“.
How is the treatment
If the burn is small but wide, you can use the vaccination with a bridge. At the same time, a healthy shoot can grow from the root. She is grafted to a part higher than the site of damage. If there is no overgrowth, you can plant an annual tree to the victim. Its tip is grafted higher than the burn site.
If the affected area is large, in the summer it will easily fall behind the wood. The exposed place must be disinfected with a solution of local vitriol, then cover with garden var and wrap with burlap.
After the treatment is completed, the supply of water and nutrients to the tree returns to normal.
Burns are most prone to pears. Peaches, apple trees, plums, cherries are less susceptible. Even buried seedlings can suffer. This often occurs when the soil is dry and proper watering is not carried out. Burns are also dangerous for young seedlings. An even greater risk is observed in transplanted young seedlings that used to grow in infertile soils.
Among other things, wounds can appear in those trees whose trunk is pulled by wire, twine or other materials that can cause ringing.
Plants wrapped in a thin plastic film from rodents may also suffer - it worsens the thermal regime.
Sunburns are a real scourge of trees. If dark spots appear on the cortex, it is necessary to conduct treatment with disinfectants and garden varieties, otherwise a fungal infection may develop. At the same time, it is important to carry out treatment work in the summer, otherwise the tree will become even worse. Most often, burns appear in early spring, with thaws. This is because at this time the trunks are not yet protected by the crown, which means that nothing prevents direct sunlight.