2024 Author: Gavin MacAdam | [email protected]. Last modified: 2023-12-16 13:38
Bark beetles occupy a special niche on the drain. Their narrow profile - eating up the dense tree shell that carries vital nutrients to the plant - makes them the most dangerous. Hidden under the upper layers, they easily endure the harsh winter conditions. What species can be found on the plum?
Variety of bark beetles
Several species live on the plum:
• corrosive arboretum;
• western unpaired bark beetle;
• fragrant woodworm;
• wrinkled sapwood.
Each of them endangers the life of the entire tree. Let's consider in more detail the representatives of this group.
Corrosive arboreal
The butterfly is large with a wingspan of 7 cm, white, with rounded bluish spots. The caterpillar is hairy, yellow with a black head, 6 cm long.
Forms 1 generation in 2 years. Hibernates in the caterpillar phase 2 times. In July and until autumn, butterflies lay eggs at the base of the buds, in the upper part of the shoot, or at the point of their branching.
The appeared caterpillars gnaw the shoots, make moves towards the thick branches down the trunk, where they lay down for the winter. For the next year, they eat wood to the base of the tree, then retire.
In spring they pupate closer to the bark. Butterflies appear in 15 days, come out. Damaged shoots dry out, break in a strong wind. The pest weakens the plum, sometimes leading to its complete death.
Western unpaired bark beetle
The beetle is smooth, with a sheen of brown-red color, 3.5 mm long, hibernating under the outer shell. Females lay eggs under the bark from early spring, throughout the summer.
The larvae continue to feed in the uterine passages with juices, a fungus introduced by the uterus. The bark beetle settles on young or middle-aged trees. In case of large damage, causing drying out, death of plants.
Odorous woodworm
A large butterfly with gray-brown front wings in a span of up to 10 cm. It hibernates 2 times in plum wood. Gives 1 generation in 2 years.
In July, butterflies lay eggs in damaged bark, covering their sticky properties with a liquid that hardens over time. The appearing caterpillars gnaw through the wood, make a common move, leaving for the winter.
The following year, individual tunnels are laid, heading up the crown. They hibernate a second time. At the beginning of summer, they pupate at the surface of the bark, turning into butterflies.
Wrinkled sapwood
A beetle 2.5 mm long is brown-black. The body looks like a cylinder. The legless larva is white, slightly curved, hibernating under the bark. Gives 1 generation.
In spring, during flowering, pupates inside the shoot. Adults gnaw through the outer layer to get out. It feeds on young branches with a hard shell. Females lay eggs under it.
The hatching larvae make moves inside the shoot. Parts of the plant damaged by them dry out. Here they stay for the winter. They cause copious secretion of juice, when in contact with air, gum is formed. With a strong defeat, all new growth dies.
Destruction measures
The fight against bark beetles with chemicals is difficult due to the fact that larvae and caterpillars live inside the wood. Therefore, treatments are conducted against flying butterflies, bugs, eggs.
In practice, the following measures are used to combat all types of bark beetles:
1. Preservation of plants from cracks by whitewashing the trunk in autumn or early spring.
2. Treatment of wounds with garden pitch.
3. Spreading with a thick layer of clay with a mullein on large branches, trunk, to prevent butterflies from flying out.
4. Cut, burn severely damaged shoots.
5. Cleaning the bark in the spring, fertilizing with complex fertilizers.
6. Purchase of planting material in nurseries with a quality certificate.
7. If moves are found on the plant, plug them with cotton wool and gasoline.
8. Several times per season, trees are sprayed against butterflies, bugs with solutions of karbofos or metaphos.
A well-trained grower will not be afraid of the difficulties of plum pest control. He will be able to apply the necessary method in time to save his beloved plant from death.
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