Cold-injury insulation sheets

Cold-injury insulation sheets

Greenpia IND / Advanced agriculture has a competitive edge

Product Composition

Size and specifications of insulation sheets

Frost limit temperature of fruit trees

Relationship between physiological activities of trees and frost

Onset conditions of cold weather and frost damage

Time of onset and causes of outbreak

Apple Tree

1. When leaves start falling after autumn, apple trees store most of its nutrients and moisture in their roots to survive the winter. At this point in time, they can endure up to minus 30℃, and thus it is rare that apple trees freeze to death.

2. It’s when the trees begin to move sap through phloem from their roots through phloem tissues from the beginning of February that problems arise.

3. The steady and gradual movement of sap from roots to stems causes dormant trees to be out of hibernation and start sprouting, but when daytime temperature goes up and nighttime temperature goes below zero, the movement of sap in the phloem tissues become unbalanced, and in most cases, sap melts during day and freezes at night, which causes cold weather damage.

4. This phenomenon is much worse in the southern part where trees get most sunlight, and it can be said that it is caused by differences in sunlight and temperatures. In order to improve this, it is necessary to prevent sudden temperature changes as much as possible and to keep out winds which affect temperature.

5. When these conditions are maintained, steady movement of sap in the phloem and normal physiological activities are guaranteed to occur, so healthy growth can be expected.

* Hongro in M9 rootstock, especially, is badly damaged. It is because it is shallow-rooted, which means that its roots are not deep-rooted but near the earth, and their roots are smaller compared to other rootstocks, and the movement of sap is faster.

Peach trees

1. It is said that peach trees are resistant to cold and can endure low temperatures from minus 20℃to minus 25℃. However, thorough preparation is needed due to differences in dormancy period and parts, and stored nutrients. The cold resistance is weak at the beginning of dormancy, but it becomes very strong in the center, and is rapidly weakened at the end in early spring, which is the latter part of dormancy period

2. They become vulnerable to cold due to temperature difference between day and night, heavy fruiting, and early defoliation, all of which cause insufficient accumulation of nutrients.

3. Frost damage by parts
– Frost damage of xylem – Frost damage of branches – Frost damage of stems – Frost damage of trunk – Withering during winter – Withering of branches – Withering of embryo

4. According to the survey on frost damage, there are considerable variations by parts; when it comes to roots, they are exposed to frost damage from minus 15℃ to minus 10℃, to parenchyma, minus 15℃, minus 10℃ to flower buds and minus 15℃ to leaves.
In addition to this, it is impossible to prevent frost damage by 100% due to variables such as stored nutrients and environment. However, the prevention of sudden temperature changes by keeping out wind and light will help to prevent frost in the early and late stages of dormancy, and especially, it effectively keeps barks of the trees from freezing. Thus, it can inhibit the occurrence of diseases such as canker.

Preventive Measures

Example of use

Apple Tree

Peach Tree