Methods for preventing damage to trees by insects, and insect damage prevention sheets.

Abstract

To provide a method for preventing damage to trees caused by rodents and other animals, such as mice, from eating not only the trunk but also the base of the trunk and exposed roots, and a tree damage prevention sheet used therein. [Solution] In a method for preventing damage to trees by harmful animals using a covering material, the covering material consists of a non-net-like sheet material 1 having a trunk covering portion 11 and a root covering portion 12, and a strip-shaped net material 2, used in combination. The root covering portion 12 of the sheet material 1 is made to adhere closely to the exposed root portion of the tree W to cover the base of the tree W, and the net material 2 is wrapped around the trunk of the tree W from above the trunk covering portion 11 of the sheet material 1 to secure it.

Description

Technical Field

[0001] The present invention relates to a method for preventing damage to trees from rodent damage, such as rats, and a damage prevention sheet used therefor.

Background Art

[0002] In forests, it is known that bears such as Asiatic black bears damage trees by stripping the bark of cedar and cypress and eating the soft parts of the trunk or tree sap as food. In recent years, similar damage by Japanese serows has also occurred frequently. Trees damaged on the trunk are not only likely to wither but also have a reduced value as lumber, which causes great damage to forestry workers.

[0003] [[ID=1,6]]Therefore, conventionally, although net-shaped materials made of synthetic resin or biodegradable resin that are wound around the trunk of a tree to protect the tree from damage by pests have been used (for example, see Patent Document 1), due to the large mesh of the net-shaped materials, it is difficult to prevent damage by small pests such as rats, and particularly the root part and exposed root part of the tree trunk are easily damaged by pests.

[0004] On the other hand, conventionally, a technique has also been proposed in which a plurality of hanging members (band-shaped members hanging downward) are arranged at the root part of a tree as described in Patent Document 2 to enhance the repellent effect on pests. The root protector for a tree used in this conventional technique is such that a belt-shaped circumferential member is wound around the trunk on the root side of the tree so that the hanging members are arranged at predetermined intervals around the trunk. Further, FIG. 9 of Patent Document 2 also discloses a method of combining with a net-shaped material.

[0005] However, since the above-mentioned root protector for a tree is a technique for obtaining a repellent effect on pests by swinging the hanging members, it is necessary to provide a gap between the root part of the tree and the hanging members in order to swing the hanging members. Therefore, there is a drawback that when rats or the like enter through the gap, the root part of the tree is damaged by pests.

Prior Art Documents

Patent Documents

[0006] [Patent Document 1] Japanese Patent Publication No. 2004-229564 [Patent Document 2] Patent No. 5437937 [Overview of the project] [Problems that the invention aims to solve]

[0007] The present invention aims to solve the problems of the above-mentioned prior art, and in summary, it provides a method for preventing damage to trees by rodents and other animals, as well as a tree damage prevention sheet used therein, which can prevent damage not only to the trunk of the tree but also to the base of the trunk and exposed roots. [Means for solving the problem]

[0008] As a means to solve the above problems, the present inventors have adopted a method for preventing damage to trees by harmful animals, which involves using a covering material to protect trees W from damage caused by harmful animals. The method involves using a non-net-like sheet material 1 having a trunk covering portion 11 and a root covering portion 12, and a strip-shaped net material 2 as the covering material. The root covering portion 12 of the sheet material 1 is made to adhere closely to the exposed root portion of the tree W to cover the base of the tree W, and the net material 2 is wrapped around the trunk of the tree W from above the trunk covering portion 11 of the sheet material 1 to secure it (the effects will be described later).

[0009] Furthermore, in this invention, after covering the exposed root portion of the tree W with the root covering portion 12 of the sheet material 1, soil E can be placed on top of the root covering portion 12 to create a tight seal with the exposed root portion of the tree W, thereby preventing the root covering portion 12 from being lifted up by the wind.

[0010] Furthermore, in this invention, a curtain-shaped sheet with cuts at predetermined intervals along one side is used as the sheet material 1, and by shifting the position of the root covering portion 12 and wrapping multiple sheet materials 1 around the trunk at the base of the tree W, the covering area of ​​the exposed root portion of the tree W can be increased.

[0011] Furthermore, in the present invention, as the sheet material 1 for the above-mentioned method of preventing damage to trees by insects, a curtain-like sheet made of a breathable material and having cuts C1 formed at predetermined intervals along one side, wherein a trunk covering portion 11 is formed by a strip-like portion without cuts C1, and a root covering portion 12 is formed by the portion divided by the cuts C1 can be suitably used.

[0012] Furthermore, in the present invention, instead of the sheet material 1 used in the above-mentioned method for preventing insect damage to trees, a plant damage prevention sheet can be used that is made of a breathable material and has radial cuts C2 on the central side, one of which is a cut C3 that reaches the outer edge, and a trunk covering portion 11 is formed by the multiple rising portions on the central side divided by the radial cuts C2, and a root covering portion 12 is formed in the outer part of the radial cuts C2. [Effects of the Invention]

[0013] The present invention provides a method for preventing damage to trees from insects, which involves using a sheet material having a trunk covering portion and a root covering portion in combination with a net material wrapped around the trunk. The method employs a technique in which the root covering portion of the sheet material is in close contact with the exposed root portion of the tree, making it possible to protect the exposed root portion of the tree from damage caused by small mice and other insects.

[0014] Furthermore, in this invention, since the net material is wrapped around the trunk over the trunk covering portion of the sheet material, the trunk covering portion of the sheet material can be made to adhere tightly to the trunk by the net material wrapped around the trunk, thereby preventing the problem of rodents or other animals entering through the gap between the trunk covering portion of the sheet material and the trunk and causing damage to the trunk by eating it. [Brief explanation of the drawing]

[0015] [Figure 1] This is a schematic diagram showing (a) a sheet material and (b) a net material used in the method for preventing tree damage by insects according to the first embodiment of the present invention. [Figure 2] This is a photograph illustrating the steps of the method for preventing tree damage by insects according to the first embodiment of the present invention. [Figure 3]This is a photograph for explaining the steps of the method for preventing damage to trees in the first embodiment of the present invention. [Figure 4] This is a schematic diagram showing a modified example of the curtain rod sheet material in the first embodiment of the present invention. [Figure 5] This is a schematic diagram showing another modified example of the sheet material in the first embodiment of the present invention, and a photograph showing the state of being attached to a tree.

Embodiments for Carrying Out the Invention

[0016] 『First Embodiment』 The first embodiment of the present invention will be described based on FIGS. 1 to 5. In the figures, what is indicated by reference numeral 1 is a sheet material, and what is indicated by reference numeral 2 is a net material. What is indicated by reference numeral C is a cut of the sheet material, and what is indicated by reference numeral H is a string for temporary fixing. What is indicated by reference numeral W is a tree, and what is indicated by reference numeral E is soil.

[0017] 「Method for Preventing Damage to Trees」 [1] Covering material to be used The method for preventing damage to trees in this embodiment will be described. First, as the covering material for the tree, a non-net-like sheet material 1 having a trunk covering portion 11 and a root covering portion 12 shown in FIG. 1(a), and a belt-like net material 2 shown in FIG. 1(b) are used. By covering the tree using these in combination, the tree is protected from damage by pests. Also, in this embodiment, as the sheet material 1, a curtain-like sheet material 1 with cuts C1 at a predetermined interval on one side is used (details will be described later).

[0018] [2] Covering the root part of the tree Next, the method of using the covering material will be described. As shown in FIG. 2(a), the trunk covering portion 11 of the sheet material 1 is wound around the trunk of the tree W, and the root covering portion 12 is brought into close contact with the exposed root portion (exposed root part) of the tree W to cover the root side of the tree W. Since the root covering portion 12 of the curtain-like sheet material 1 in this embodiment is divided into a plurality of parts, when the trunk covering portion 11 is wound around the trunk of the tree W, the cuts C1 are in an expanded state. The positions of the respective root covering portions 12 are adjusted so that the exposed root portions of the tree W are arranged directly below these respective root covering portions 12.

[0019] Also, when using the above-mentioned curtain-shaped sheet material 1, there may be cases where all the exposed root portions cannot be covered with a single sheet material 1. In such cases, as shown in Fig. 2(b), by shifting the position of the root covering portion 12 and winding a plurality of sheet materials 1 around the trunk on the root side of the tree W, the number of root covering portions 12 can be increased and the covering area of the exposed root portions of the tree W can be expanded. In this embodiment, two sheet materials 1 are wound around each other, but three or more sheet materials 1 can also be used.

[0020] After winding the trunk covering portion 11 of the above-mentioned sheet material 1 around the trunk of the tree W, in this embodiment, a string H is wound around and tied to the outer periphery thereof to temporarily fix the trunk covering portion 11. The method of temporarily fixing the trunk covering portion 11 of this sheet material 1 can also be performed using, for example, a clip or the like in addition to using the string H.

[0021] [3] Winding of the net material Regarding the above-mentioned net material 2, as shown in Fig. 3(a), the net material 2 is wound around and fixed to the trunk of the tree W from above the trunk covering portion 11 of the sheet material 1. Specifically, the net material 2 is wound around the trunk of the tree W in a spiral shape from the upper side toward the root side, pressing the trunk covering portion 11 of the sheet material 1 inward and fixing it in a state of being firmly adhered to the trunk of the tree W. The method of winding the net material 2 can also be to wind it in a spiral shape from the root side of the tree W toward the upper side.

[0022] Also, regarding the method of fixing the end portion of the above-mentioned net material 2, in this embodiment, after winding once from the upper side toward the root side, it is folded back upward and wound around, and the end portion of the net material 2 wound around is inserted into the gap between the net materials 2 wound for the first time and fixed. Regarding the method of fixing the end portion of this net material 2, other methods such as clip fixing or dividing the end portion of the net material 2 into two and winding and tying it to the trunk can also be adopted.

[0023] [4] Fixing of the root covering portion of the sheet material In this embodiment, after covering the exposed root portion of the tree W with the root covering portion 12 of the sheet material 1, soil E is placed on top of the root covering portion 12 to fix it in place, as shown in Figure 3(b). This not only allows the root covering portion 12 to be in close contact with the exposed root portion of the tree W, but also conceals the exposed root portion of the tree W, and further prevents the root covering portion 12 from being lifted up by the wind.

[0024] [5] Other methods for making the root cover portion adhere closely to the exposed root portion In addition to the method of covering the exposed root portion 12 of the sheet material 1 with soil E as in this embodiment, other methods can also be employed to secure the root portion 12, such as placing a weight on top of the root portion 12 to fix it in place, or driving a stake into the soil from above the root portion 12 to fix it in place.

[0025] "Composition of sheet material (insect damage prevention sheet)" [1] Form of sheet material Next, the structure of the sheet material 1 will be described in detail. In this embodiment, as shown in Figure 1(a), a curtain-shaped sheet material 1 is used, in which notches C1 are formed at predetermined intervals along one side. The trunk covering portion 11 is formed by the strip-shaped portion without notches C1, and multiple root covering portions 12 are formed in the portions divided by the notches C1. The number and spacing of the notches C1 in the sheet material 1 can be freely adjusted, and for example, the spacing and position of the notches C1 can be adjusted according to the position and size of the exposed root portion of the tree W.

[0026] [2] Materials of the sheet In this embodiment, the material used for the sheet material 1 is a fabric made of breathable film slit yarn, but any non-net-like sheet, such as a resin sheet, can also be used. When a breathable sheet material 1 is used as in this embodiment, even if the trunk covering portion 11 and root covering portion 12 of the sheet material 1 are in close contact with the trunk and exposed roots of the tree W, the respiration of the tree W is not inhibited, and therefore the growth of the tree W is unlikely to be adversely affected. Suitable breathable sheet material 1 includes woven or knitted fabrics and resin sheets with ventilation holes. When the sheet material 1 is in close contact with the tree W, it is preferable to avoid using hard materials such as metal that may damage the tree W.

[0027] When using woven or knitted fabrics for the sheet material 1 described above, filament yarns or spun yarns other than film slit yarns can also be used as the yarn components. Natural fibers and chemical fibers can also be used as the yarn material, in addition to synthetic resin fibers. Furthermore, in this embodiment, the repellent effect on pests is enhanced by using glossy film slit yarns, but it is also possible to use colored yarns or yarns coated or kneaded with repellents that have repellent properties other than glossy yarns.

[0028] [3] Examples of changes in the form of sheet material In this embodiment, the sheet material 1 is rectangular overall, but it is not limited to this as long as the root covering portion 12 is divided into multiple sections by the cuts C1. For example, as shown in Figure 4(a), the overall shape of the sheet can be trapezoidal to increase the area of ​​the root covering portion 12.

[0029] In this embodiment, the trunk covering portion 11 and the root covering portion are formed from a single sheet. However, as shown in Figure 4(b), the trunk covering portion 11 and the root covering portion 12 can also be constructed from separate sheets and integrated using adhesive or heat sealing. In that case, different materials can be used for the trunk covering portion 11 and the root covering portion 12.

[0030] [4] Forms of sheet material other than curtain-like Furthermore, the sheet material 1 does not need to be in a curtain-like shape as long as it can cover the trunk and exposed root portion of the tree W. For example, as shown in Figure 5(a), it can be in a shape that has radial cuts C2 on the central side, with one of them becoming a cut C3 that reaches the outer edge. In this sheet material 1, the multiple upright portions on the central side divided by the radial cuts C2 become the trunk covering portion 11, and the portions outside the radial cuts C2 become the root covering portion 12.

[0031] As shown in Figure 5(b), the sheet material 1 is used by inserting the trunk of the tree W into the notch C3 extending to the outer edge, and attaching it so that the trunk covering portion 11 stands upright along the trunk. At this time, the sheets on both sides of the notch C3 can be connected and fixed by inserting a U-shaped peg P (stake) into the soil from above the root covering portion 12 into the notch C3 extending to the outer edge, or a connecting device such as a clip can be used instead of a peg P. After attaching the sheet material 1, the net material 2 is wrapped around the lower part of the trunk (see Figure 5(b)), and the root covering portion 12 is covered with soil (not shown) to complete the installation. When this form of sheet material 1 is adopted, the root covering portion 12 is not divided, so the entire circumference of the trunk can be covered when attached to the tree W. In addition, the radial notches C2 can be perforated so that the length of the notches C2 can be adjusted to match the thickness and shape of the trunk when in use.

[0032] "Composition of netting material (insect damage prevention netting)" [1] Form of net material In this embodiment, the net material 2 is a warp-knitted fabric knitted in a net-like manner, as shown in Figure 1(b). Specifically, a chain stitch structure is formed by warp threads arranged at predetermined intervals in the width direction (a direction perpendicular to the length direction of the knitted fabric), and connecting threads (inserted threads in warp knitting) are crossed between adjacent chain stitch structures every few courses to connect the chain stitch structures and form a warp-knitted fabric.

[0033] In this embodiment, the above-mentioned woven or knitted fabric employs a warp-knitted fabric with multi-directional (vertical, horizontal, and diagonal) elasticity. However, a fabric with longitudinal elasticity that can follow the growth of tree trunks and branches is preferable. For example, warp-knitted fabrics such as Denby knit, cord knit, Atlas knit, tricot knit, Raschel knit, and double Raschel knit can be used, and weft-knitted fabrics can also be used. Furthermore, woven fabrics can be used instead of knitted fabrics, such as plain weave, twill weave, herringbone weave, tatami weave, and multi-layer weave.

[0034] Furthermore, in this embodiment, a warp-knitted net is used, in which multiple chain stitch structures (warp threads 1) arranged in the width direction at predetermined intervals are connected with connecting threads as the warp-knitted fabric. However, the mesh shape of the knitted net is not particularly limited and can be triangular, square (square or diamond), hexagonal (tortoise shell), etc. Also, the type of net is not limited to warp-knitted fabric and can be used as appropriate, such as knotless or knotted nets.

[0035] In this embodiment, the end of the net material 1 is inserted into the gap between the net materials 1 that have already been wrapped around the trunk of the tree W to secure it, so the end of the net material 1 is not divided. However, the end of the net material 1 can also be divided into multiple pieces using a cutter or the like, and then the end of the net material 1 can be tied to the trunk of the tree W to secure it.

[0036] [2] Net material In this embodiment, the material for the net material 2 described above is a PE film yarn (film slit yarn) used for one of the warp and connecting yarns as the yarn for the woven fabric, and a PET / PP filament yarn used for the other connecting yarn. However, as the film yarn, other synthetic resin film yarns or biodegradable resin film yarns (e.g., polylactic acid resin) can be used, and monofilaments can also be used. Furthermore, as the twisted yarn, other synthetic fibers (e.g., polyethylene, polypropylene, polyester, nylon, acrylic, etc.), semi-synthetic fibers (e.g., acetate, etc.), regenerated fibers (e.g., rayon, cupro, etc.) can be used, and spun yarns of natural fibers (e.g., cotton, linen, etc.) can also be used. It is also possible to use a combination of different types of yarns.

[0037] In this embodiment, a portion of the yarn in the woven fabric is made of woolly yarn, which is PET / PP filament yarn that has been treated with a woolly finish. This prevents the net material 2 from slipping off when wrapped around a tree, as the woolly yarn catches on the bark. [Explanation of Symbols]

[0038] 1 Sheet material 11 Stem covering part 12 Root cover 2 Netting C cut H string W Tree E Saturday P pegs

Claims

1. In a method for preventing damage to trees from harmful animals by using covering materials, As the covering material, a non-net-like sheet material having a trunk covering portion and a root covering portion, and a strip-shaped net material are used in combination, A method for preventing insect damage to trees, comprising: making the root-covering portion of the sheet material tightly attached to the exposed root portion of the tree to cover the base of the tree; and wrapping and securing a net material around the trunk of the tree over the trunk-covering portion of the sheet material.

2. The method for preventing damage to trees from insects according to claim 1, wherein after covering the exposed root portion of the tree with the root covering portion of the sheet material, soil is placed on top of the root covering portion to ensure close contact with the exposed root portion of the tree.

3. The method for preventing insect damage to trees according to claim 1, wherein the sheet material used is a curtain-shaped sheet material with cuts made at predetermined intervals along one side, and multiple sheets are wrapped around the trunk at the base of the tree with the positions of the root covering areas shifted.

4. A tree damage prevention sheet used as a sheet material for the tree damage prevention method described in claim 1, comprising a breathable material and having a curtain-like shape with cuts made at predetermined intervals along one side, wherein a trunk covering portion is formed in the uncut, strip-shaped portion and a root covering portion is formed in the portion divided by the cuts.

5. A tree damage prevention sheet used as a sheet material for the tree damage prevention method described in claim 1, comprising a breathable material, wherein radial cuts are formed on the central side, one of which extends to the outer edge, a trunk covering portion is formed by multiple rising portions on the central side divided by the radial cuts, and a root covering portion is formed on the outer portion of the radial cuts.

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