JPH04278042A - Method for thermally killing insect pest - Google Patents

Abstract

PURPOSE:To provide a method for controlling the insect pests of trees without causing the damages of other trees, human bodies and environments which have been caused by chemicals, etc. CONSTITUTION:A heat-generating belt 2 is wound on the trunk of a tree, and an electric current is applied to the belt to generate heat, thereby heating the bark parts of the tree to kill insect pests living in the tree.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for exterminating pests such as pine beetles that hide in trees.

0002

BACKGROUND OF THE INVENTION Bark beetles cause damage to trees by making holes under the bark or in the wood, and during the breeding season they lay eggs in the trunk, causing great damage to both adults and larvae. Among these, the pine beetle burrows into the trunks of pines such as black pine and red pine and enters new shoots, and its larvae feed between the bark and wood, killing the tree. Types of pine beetles,
There are pine tree beetles, pine tree bark beetles, yellow tree beetles, pine tree weevils, pine tree star weevils, etc., and these breed and spread one after another, sometimes wiping out surrounding trees. It is generally well known that if pine borers attach to a pine tree, the tree will die within a year or two. However, very few people have seen the pine borer (pine nematode). The length is about 0.8 mm to 1 mm, so it is invisible to the human eye. Even if a million pine borers (pine nematodes) breed in one pine tree, if there is no one to carry them to other trees, that pine tree will die. Other trees are not affected. As the trees die, the nematodes also die. However, when the spotted beetles and pine borers (pine nematodes) coexist in the same tree, by the time the spotted beetles turn into larvae, 10,000 to 20,000 pine nematodes can multiply. do. Therefore, when a long-spotted beetle flies out of a tree, about 10,000 nematodes attach to its body and they move to other trees together. Spotted longhorn beetles lay their eggs by making holes in other trees. At this time, the nematodes that were attached to the body of the spotted beetles enter the holes made by the spotted beetles and take up residence in the tree. In this way, they devour trees one after another. In order to exterminate these pests, conventional methods include spraying insecticides, coating the tree trunk with clay containing insecticide, and wrapping the tree trunk in straw to trap the larvae that have migrated into it. There were methods to do this.

0003

[Problems to be Solved by the Invention] However, the above-mentioned conventional methods are ineffective and difficult to completely exterminate, and the sprayed chemicals may harm other trees, humans, and animals. There was also the problem that there was a risk of giving.

0004

[Means for Solving the Problems] The present invention has been devised in view of the above-mentioned current situation, and involves wrapping a heating zone around the trunk of a tree and generating heat by energizing the heating zone, This heat heats the bark of the tree and kills pests inside the tree.

[0005]

[Operation] According to the present invention, the bark of the tree is heated by the exothermic zone, so that pests are killed. Of course, in order to kill only pests and minimize tissue destruction of the tree, it depends on conditions such as the type of tree, its condition such as thickness and length, temperature and moisture, and the type of target pest. Therefore, it is preferable to appropriately set the amount of heat generated in the heating zone to minimize the impact on trees and maximize the killing effect.

[0006]

Embodiments Examples of the present invention will be described in detail below with reference to FIGS. 1 to 3. 1 is a tree, 2 is a band-shaped exothermic zone, 3
4 is a temperature sensor, 4 is a controller, and 5 is a power supply device. As shown in FIG. 2, the heating zone 2 may be covered from the outside with glass wool 6 for heat retention. Bark part 11 of tree 1
There are pests lurking in. As shown in Figure 3, the epicenter 2 is
It has a structure in which a heating element 21 is covered with a heat-resistant insulating coating 22 such as silicone rubber, and a connecting terminal 23 is provided. Temperature sensor 3
A small hole is made in the bark part 11 of the tree in the gap between the heating zone 2 and set so that the temperature of the bark part 11 can be measured. A plurality of heating zones 2 are connected in parallel to a controller 4, and temperature sensors 3 are set at several locations. It is best to wrap the heating zone 2 and the heating zone 2 with a slight shift between them. The controller 4 includes a temperature setting dial 41 for setting the heating temperature and a timer 42 for setting the heating time.

As described above, when the heating zone 2 is wrapped around the tree 1 and the controller 4 starts controlling the tree 1, the heating zone 2 starts generating heat and raises the temperature of the bark portion 11. The temperature of this skin portion is detected by the temperature sensor 3 and input to the controller 4. Then, the temperature specified by the temperature setting dial 11 and the skin portion 1 detected by the temperature sensor 3 are determined.
It is controlled so that the temperatures of 1 are the same. As described above, since it is covered with glass wool 6 to improve heating efficiency, wasteful heat radiation is reduced and efficiency is improved. The thickness of this glass wool 6 may be about 5 mm. Also, the moisture in the tree 1 evaporates slightly due to heating, but by wrapping the heating zone 2 with a gap,
Moisture evaporates through the gaps. Furthermore, since the glass wool 6 is not waterproof, raindrops and the like can enter from the outside, but since the heating zone 2 is provided with a highly insulating coating film, there is no need to worry about electrical leakage or short circuits.

[0008] In this way, by applying heat to the surface of the tree, only pests can be killed. According to experiments, when the temperature was set at 40°C, the animals did not die even after an hour had passed, but when the temperature was set at 47°C, 30
After minutes, 70% of the pests were dead. Furthermore, when the temperature setting was set to 51°C, 90% of the pests were killed after 30 minutes, and when the temperature setting was set to 52°C, 100% of the pests were killed after 30 minutes. Therefore, if there is an ability to heat the skin portion 11 to a temperature of 50° C. or higher, pests can be killed.

By operating the temperature setting dial 41 and heating time timer 42, it is possible to specify the optimum temperature and time for heating depending on the type and condition of the tree and the type of target pest. It is. At this time,
Since the temperature of the bark portion 11 is constantly monitored by the temperature sensor 3, it is prevented that the temperature rises too much and destroys the tree cells. Further, it is preferable that the timer 42 performs heating intermittently at predetermined time intervals. The temperature sensor 3 may be embedded in the bark part 11 of the tree,
When the tree is small, it may be rolled in together with the above-mentioned generating zone 2. It is also possible to monitor the temperature inside the tree 1, which is not the bark part 11, to prevent damage to the tree due to a rise in temperature inside the tree. Further, under conditions of low moisture, the coating film of the heating zone 2 may have low waterproofness. Also, if the ambient temperature is not low, it is not necessary to cover it with glass wool. The heating zone 2 may be a normal heating wire, and the connection method can be selected from series connection or parallel connection depending on the capacity.

[0010] According to this killing method, the insecticidal effect is only applied to the heated trees, so there is no risk of harm to other trees, humans, or animals, unlike the conventional methods. Therefore, it is possible to reliably kill only the pests of the target tree without harming other living things.

[0011]

[Effects of the Invention] According to the method for killing pests by heating of the present invention, heat is applied to kill pests hiding in trees, so unlike conventional methods, they do not harm other trees, humans, or animals. There will be no fear at all. Therefore, it is possible to reliably kill only the pests of the target tree without infecting other living things.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram showing an example of the method for killing pests by heating according to the present invention.

FIG. 2 is a plan cross-sectional view of the tree of the same example.

FIG. 3 is a cross-sectional view of an example of a heating zone used in the present invention.

[Explanation of symbols]

1 Trees 2. Belt-shaped epicenter 3 Temperature sensor 4 Controller 6 Glass wool 11. Skin part 21 Heating element 22 Heat-resistant insulation coating 41 Temperature setting dial

Claims (1)

[Claims] Claim 1: The method is characterized in that a heating zone is wrapped around the trunk of a tree and electricity is applied to the heating zone to generate heat, and the bark of the tree is heated by this heat to kill pests in the tree. A method of killing pests by heating.