Is longicorn beetle a beneficial pest or pest? Is the bite poisonous?

Longicorn beetle is a kind of insect we used to catch and play with when we were young, with long tentacles and black skin with a day shift. There are many kinds of longicorn beetles, which are widely distributed in China. Most of the longicorn beetles are large or medium-sized and like to move on trees. Was the cow a good pest or a pest that day? Is the bite poisonous?

Is longicorn beetle a beneficial pest or pest?

Longicorn beetles are the main pests in forestry production, crop cultivation and construction wood. Longicorn beetles are mainly pests of woody plants, which erode tree trunks, branches and roots in the larval stage. Some of them are harmful to herbs, and the larvae live in the stems or roots, such as longicorn beetles, melon and rattan longicorn beetles. Individual species, such as cotton capsule longicorn beetles, harm cotton capsules. There are a few species, the larvae do not live in plant tissue, but feed on the roots in the soil, such as big teeth and curved teeth saw longicorn beetles, grass longicorn beetles and so on.

Is it poisonous for longicorn beetles to bite?

Longicorn beetles are not poisonous. You can rest assured. So what should we do if we are bitten by longicorn beetles? The first step of being bitten by longicorn beetles must be to find a way to make the longicorn beetles release their mouths. The specific way is to let go and wait for them to release their mouths. Do not pull them forcefully, otherwise they may cause bruises. When the longicorn beetle is relieved, you can observe the wound. If there is no scratch or bleeding, you only need to use the ice to hurt.

What are the hazards of longicorn beetles? How to prevent and cure?

The larvae of longicorn beetles eat tree trunks and branches, affecting the growth and development of trees, weakening the tree, causing germs to invade and easily be broken by the wind. When the damage is serious, the whole plant dies, the wood is eaten, and the technological value is lost. In the larval stage, longicorn beetles eat tree trunks, branches and roots, some of which harm herbs, and the larvae live in stems or roots, such as chrysanthemum longicorn beetles, melon longicorn beetles, etc.; some species, such as cotton capsule longicorn beetles, damage cotton capsules; there are a few species, larvae do not live in plant tissue, but feed on roots in the soil, such as big teeth and curved teeth saw longicorn beetles, grass longicorn beetles, and so on.

Longicorn beetle larvae and adults like to move on trees, such as mulberry, willow, poplar, citrus, pine and so on.

(1) physical prevention

1. Hunting and killing adults:

Artificial shock or direct hunting can be used for longicorn beetles with pseudo-death or dry-based habitat characteristics.

2. Kill the larvae:

Artificially hammering the eggs and peeling off the bark to kill the larvae.

3. White the trunk:

The trunk 1.5-2 meters above the ground is painted white to prevent longicorn beetles from laying eggs. If there are cuts and saws on fruit trees, protective agents (varnishes, etc.) should be smeared in time to prevent longicorn beetles from spawning.

4. Trapping with traps:

The adults of some longicorn beetles (such as Monochamus alternatus) have the ability of sugar and vinegar, which can be artificially prepared (sugar: vinegar: wine is 1pur0.5 and 1.5), and insecticides (such as trichlorfon, etc.) are added to trap and kill.

(2) Biological control

Longicorn beetles have many predatory and parasitic natural enemies, and swollen-legged wasps are one of them. Swollen-legged wasps can find longicorn beetle larvae and pupae along the insect track and lay eggs in longicorn beetle larvae or pupae. After hatching, the eggs of swollen-legged wasps absorb the nutrition of longicorn beetle larvae and pupae, resulting in their death, and achieve the effect of control. In addition to swollen leg wasps, there are velvet parasite, Beauveria bassiana and parasitic nematodes, which have been commercialized and can be used.

(3) Chemical control

1. Adult pest control

During the peak period of larval Eclosion (June-July), pyrethroids, chlorpyrifos and imidacloprid were sprayed once in 5-7 days. The spraying site was mainly branches and cadres, and each time it was sprayed thoroughly. Make the liquid flow along the trunk to the root; or use the above agents to dry.

2. Control of eggs and young larvae.

Longicorn beetle spawning and low-instar larvae are all under the epidermis of fruit trees and do not harm the xylem. At this time, we should pay attention to let the larvae or eggs under the bark come into contact with chemicals to kill eggs and low-instar larvae.

During the peak period of spawning and hatching of longicorn beetles (the peak of spawning is usually from June to July), the oviposition grooves and larval hazards (check tree surface wounds and wormholes) are found, and three methods of chemical smearing, poisonous cotton dressing and poisonous soil stickiness are used to control them.

3. Medicament smear

Use pyrethroids, organophosphorus and other insecticides plus diesel oil to smear

4. Bandaging with poisonous cotton

Absorb the liquid on the cotton and wrap it on the branch (first scrape off the old skin), and then wrap it in plastic film.

5. Poisonous soil stickiness

The medicine solution is mixed with appropriate amount of clay to make medicine soil, which is applied to the harmful areas of spawning and larvae.

6. prevention and control of larvae in the borer.

When the advanced instar larvae enter the xylem, it is more difficult to control them. First of all, find the wormhole of the new defecation (the tree trunk and the feces under the tree have been washed away after the heavy rain, and the fresh defecation hole is easy to identify). If there are more than one defecation hole, you should choose the last hole, dig out the dung shavings first, plug or inject the medicine into the decay channel (you can choose camphor pills, gasoline, cotton stained with chemicals, etc.), then seal the hole with wet clay or wet yellow mud, and check the effect after 7 days. If there is a new fecal discharge hole, it should be repaired.