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  • Writer's picture三重県剪定伐採お庭のお手入れ専門店 剪定屋空

Pine weevil damage control in Komono-cho, Mie Prefecture (Injecting chemicals into the trunks to pre

The best method of control for pine bark beetles depends on the specific situation and the severity of the infestation. Here are some common control methods.

Cultural Control. Removing debris near the base of trees and removing infested or weakened trees can reduce the number of pine bark beetles in an area.

Physical Control. Placing physical barriers around the trunks of juvenile trees can help prevent the midges from reaching the bark.

Chemical control. Spraying insecticides into the soil or injecting them into the trunks is an effective way to control pine weevils. However, it is important to follow label directions carefully and use only products labeled for use on specific types of trees.

The chemical used in this study was Greenguard NEO.

Drill holes using an impact drill and check for yani After yani is confirmed, fill the holes with artificial bark such as Lac Valsan.

In general, a combination of these control methods is often the most effective way to manage pine weevils. It is also important to regularly observe trees for signs of infestation and to take immediate action if an infestation is detected.

Greenguard NEO is a pesticide solution containing 20% of the ingredient trans-1, 4, 5, 6-tetrahydro-1-methyl-2-[2-(3-methyl-2-thienyl)vinyl]pyrimidine tartrate and 80% water and other organic solvents. It is used to prevent pine beetle infestation and growth, and the amount used depends on the diameter of the tree.

The stated effective period after injection is usually 7 years, but it varies depending on conditions. There are two injection methods: natural pressure injection and pressurized injection. The time required to complete injection depends on the age and vigor of the tree, and a pressurized method may be used.

Injection holes are drilled with a 6.5 mm diameter drill at a depth of 4 to 9 cm diagonally downward into the tree trunk 50 cm to 1 m above the ground, avoiding directly under large nodes. This product is not effective on adult pine beetles, pines with abnormal resin loss, or pines with discolored branches and leaves.

Pine weevil damage control in Komono-cho, Mie Prefecture (Injecting chemicals into the trunks to prevent pine dieback)

Chest height diameter 37 cm, 6 ampules, staggered.

The pine pine bark beetle is a species of insect belonging to the family Ophiuroidea and subfamily Ophiuroidea. It attacks various species of pine trees and causes severe damage to forest ecosystems. There are many species of pine bark beetles, and each species tends to prefer certain types of pines.

Ecologically, pine bark beetles (Pinus pinaster) play an important role in the natural processes of the forest. Pine bark beetles feed on the inner bark of pine trees, and severe infestations can cause the trees to become banded and die.

As a result, the trees fall, creating space for new growth and benefiting other species in the ecosystem, so it may not be desirable to eradicate all pine bark beetles in general. However, if the pine bark beetle population increases too much, pine trees may die over a wide area and have a negative impact on the ecosystem, so it would be better to control pine trees that are valued in gardens and forests.


Pine beetles are attracted to weakened, stressed, or dying trees and attack in large numbers. They can also spread from tree to tree by flight, and infestations can spread rapidly. The severity of pine beetle infestations can be influenced by many factors, including temperature, drought, fire, and human activities such as logging and land development.

A study of the timing of last year's pine bark beetle outbreak in Mie Prefecture shows that pupae were confirmed on May 1 in Iga City, and the date of first adult emergence was May 24, so Greenguard NEO is often used up to three months prior to an outbreak.

Pine bark beetles (Pinus pinaster) play an important role in the dynamics of forest ecosystems, but their populations must be monitored and controlled to prevent widespread damage to pine trees.


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