Cone-shaped things on young spruce trees-- control of larch ball aphids
On the young trees of spruce, a round shape similar to a small cone often appears in June, which is actually a gall caused by larch aphid. In order to complete a life cycle, larch aphids need to undergo several different insect type changes in spruce and larch trees. Its life process can be seen in 156. What is the white hair on the leaves of larch?
Artificial removal of galls from spruce before galls crack.
Strengthen preventive measures to prevent the transportation and afforestation of seedlings with insects.
Spruce and larch can not be mixed or planted closely, the isolation distance should be more than 500m (m).
Protect natural enemies in the forest, including ladybugs, lacewings, brown flies, aphid flies, etc.
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Techniques of Spruce Seedling
Spruce is a pine spruce, evergreen trees, up to 30 meters high, is the main species of mountain forests in our region. Spruce wood is soft and delicate, which can be used for construction, furniture, papermaking and other materials, as well as ornamental trees. A, cuttage seedling cuttage time should be in early spring after taking out new shoots, cut 15 cm long cuttings, cuttage in the plastic shed. In order to increase the ground temperature, the bottom of the bed can be padded with horse manure, keep the ground temperature at 25-35℃, and the humidity is about 90%. The plastic shed should be covered tightly and should not be opened frequently to avoid lowering.
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Spruce bud rust
Spruce bud rust is a newly discovered disease in the northern forest region of China, which has been reported in the natural forest region of Xing'an Mountains. It is mainly distributed in the United States, Canada, Sweden and other countries abroad, harming white spruce, black spruce and European spruce, harming the terminal and lateral buds of seedlings, young trees and big trees, and seriously affecting the quality of seedlings and the normal growth of plantations. Symptoms appear when new leaves begin to grow in late May. During the same period, diseased buds grew faster and longer than healthy buds, but soon stopped growing. Diseased leaves growing from diseased buds
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