When you notice a hole in the wood, you don't?
The ecology of bark beetles and when they occur.

Among the insects that harm wood used for houses and furniture, the most common in Japan is Termites And Bark beetles is. Bark beetle There may be surprisingly few people who have seen larvae or adults. This is because larvae are lurking in holes drilled in wood, making it difficult to witness them. Even if they become adults and escape from the holes, they usually die about 10 days ago. You may not want to encounter them if you can, but it's a pest with a low encounter rate for the damage. Damage reported in Japan Bark beetles In Flying bark beetle , Oak flycatcher , Zelkova beetle , African Flycatcher Beetle Etc.

Bark beetle Is a slender beetle, and its body color varies from reddish brown to yellowish brown or blackish brown. The adult length of Beetle bark beetle is 2.2 mm to 7.0 mm, which is characterized by large individual differences compared to other insects. The average size is 3 to 4 mm. It is said that nutritional conditions during the larval stage (ie, the type of wood, etc.) have an effect. By the way, in Japan, there is usually one generation per year (egg → larva → pupa → adult), but the life span varies depending on temperature and nutritional conditions. They can become adults in three months or more than two years. Adults generally occur from spring to summer, with peaks in June. If nutrients are lacking, they may appear in the fall, or if the room is warm year-round due to heating, etc., they may appear in the winter, so please observe carefully throughout the year.

Bark beetle Female adults insert ovipositors into the wood of their choice and lay eggs in the tract (conduit), which is responsible for water conduction. Eggs are pierced by drilling one to several holes at a time, for a total of several tens of holes. Hatching in about 10 days, the milky white larva moves while devouring the inside of the wood, so even if you do not understand it looks, the damage may be large. The larva winters in the tree, pupates in spring, emerges and emerges. At this time, a hole with a diameter of about 1 to 2 mm is made on the surface of the damaged material, and powder (funnel and food waste) often falls near the hole. If you find a hole like the photo, Bark beetle Let's doubt.

Type of bark beetle and outbreak area.
What kind of environment is susceptible to damage?

Flying bark beetles and oak bark beetles that look and feel very similar. In any case, it is difficult to judge by size because individual differences occur in nutritional conditions. By comparison, the giant leaf bark beetle has a difference in gloss on the head, and the giant leaf bark beetle has no gloss.

The beetle was originally a pest that was more harmful to the west than in central Honshu, but has now expanded its distribution area to Hokkaido. On the other hand, the Japanese bark beetle lives north of Kanto including Hokkaido. In other words, if it is found in western Japan, Kyushu, or Okinawa, it is possible that the broad beetle will be widely distributed, but it will be difficult to identify because there are many other species.

By the way, oak leaf beetle is not often found in Nara, but it is named because it prefers oak wood, but it damages a wide range of hardwoods, not just oak wood. There is also a kind of zelkova beetle, but similarly damage can be seen other than zelkova, Bark beetle It is also difficult to identify the type. In any case, what kind of Bark beetle Also need to be addressed in a common and effective way.

In recent years, DIY has been making handmade shelves and desks, and renovating and renovating houses. In such a case, please pay attention to the types of building materials. But why…?

Bark beetles that damage wood are important pests in wooden houses.
What kind of wood do you like for bark beetles?

Bark beetle As the name implies, they are tree-eating insects, but they do not eat all trees randomly. Eating in search of cellulose in decayed wet wood Termite Unlike Bark beetle (larva) Seeks and eats starch from dry wood.

Cellulose is high in wood, but low in starch, Bark beetle Female adults first test-eat and then lay eggs by selecting wood with a starch content of 3% or more.

At this time, the female adult lays eggs by inserting an ovipositor into a wooden tract (conduit), but the egg diameter is about 0.16 mm, so if the vascular (conduit) is not thicker than that, it can lay eggs. can not.

In other words, it is mainly wood that has a high starch content, is dry, and has a vessel (conduit) thicker than the egg diameter. Bark beetle Typical materials that are often damaged by Rawan Lumber And Oak wood Is the center. Others Oak , Bamboo , Zelkova , Drill Please note that damage can also be seen. Basically, they often damage forest trees Bark beetle However, it is a habit to check frequently as it will harm the pillars, flooring and ceiling of the house, furniture such as closets and bookshelves.

Recommended bark beetle measures.
What should I do even after the damage?

What are the measures to control bark beetles?

• Avoid hardwoods such as rawan and oak and use conifers such as cedar and cypress.
• Paint is used on the wood surface to prevent flying and spawning.
• Prevent medications.
• Inspect periodically during cleaning and try to find it early.

If you find any harm ...?

• Make sure that there is no rattling noise.
• Insert the nozzle of a Pyrethroid Pest Control (insecticide) effective against powdery mildew into the escape hole of the wood and spray.
  *Even if there are no larvae or adults anymore, we recommend spraying as a preventative measure to prevent recurrence.
• 大量発生してしまい被害が大きいときは専門の駆除業者さんに依頼する。
  ※費用は被害の範囲と規模によります。

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