Terrestrial gastropod repellent sheet

Abstract

To provide a terrestrial gastropod repellent sheet that utilizes a natural-origin repellent for enhanced safety, demonstrates a high repelling effect against slugs and snails, and minimizes the leaching of the repellent when plants are watered.SOLUTION: A terrestrial gastropod repellent sheet comprises a sheet-like substrate whose one side is provided with a coating layer. The coating layer contains a terpene as an active ingredient. The coating layer has a water contact angle of 80° or more.SELECTED DRAWING: None

Description

Technical Field

[0001] The present invention relates to a terrestrial gastropod repellent sheet that prevents terrestrial gastropods such as slugs and snails, which damage new shoots, flowers, leaves, fruits, etc. of plants and cause great damage to the agricultural and horticultural fields, from approaching plants.

Background Art

[0002] In plant cultivation, watering is frequently performed to maintain the soil around the plants in a moist environment. Such a moist environment is likely to generate terrestrial gastropods such as slugs and snails. These slugs and snails like to eat new shoots, flowers, leaves, fruits, etc. of plants, so damage in the agricultural and horticultural fields has become a problem.

[0003] Conventionally, for the control of slugs and snails, synthetic agents such as paraformaldehyde and metaaldehyde have been sprayed as attractant contact poisons. However, in these synthetic agents, while having a strong control effect, problems such as damage to plants, contact toxicity to the human body, livestock, and pets during spraying, or environmental pollution have been pointed out, and a conversion to a repellent derived from natural products is desired.

[0004] For example, in Patent Document 1, saponin collected from the seeds of Theaceae plants has a good repellent effect on slugs and snails, and repellent tapes and the like obtained by attaching saponin to tapes or sheets made of synthetic resin materials and the like have been proposed. These repellent tapes and the like have good usability, such as being wound around a flowerpot or laid under a flowerpot. In these repellent tapes and the like, the base material of the tape or the like is formed of a synthetic resin material containing saponin, or saponin is simply applied to the surface of the tape or the like.

[0005] Herein lies the problem that saponins are water-soluble substances, making it difficult to incorporate saponins into synthetic resin materials to form substrates such as tapes, and it is extremely difficult to incorporate high concentrations of saponins to effectively exhibit a repellent effect. Furthermore, simply applying saponins to the surface of tapes, etc., results in the water-soluble saponins leaching out during watering of plants or rainfall, leading to a lack of sustained effectiveness.

[0006] To solve these problems, Patent Document 2 proposes a method of impregnating a water-based resin with saponin and applying it to the surface of a tape or sheet. With this method, although the saponin does not wash away all at once when watering, as in the tape or sheet of Patent Document 1, it is obvious that since saponin is a water-soluble substance, it will gradually wash away each time watering is performed, and the effect will decrease. In addition, saponin and water-based resins have a high affinity for water-soluble substances, and sand, dust, and many hydrophilic organic materials brought to the surface when watering tend to accumulate on them. Terrestrial gastropods then crawl over these deposits, reducing the repellent effect. [Prior art documents] [Patent Documents]

[0007] [Patent Document 1] Japanese Patent Publication No. 2002-171892 [Patent Document 2] Japanese Patent Publication No. 2013-155116 [Overview of the Initiative] [Problems that the invention aims to solve]

[0008] This invention has been made in view of the above-mentioned problems, and aims to provide a terrestrial gastropod repellent sheet that uses a repellent derived from natural products, is highly safe, has good repellent effects against slugs and snails, and suppresses the leaching of the repellent due to watering plants, etc. [Means for solving the problem]

[0009] In solving the above problems, the present inventors, after diligent research, discovered that by providing a coating layer containing terpenes and having a water contact angle of 80° or more on one side of a sheet-like substrate, an excellent repellent effect against terrestrial gastropods is observed, and the leaching of terpenes due to watering is less likely to occur, thus maintaining the repellent effect, and thus the present invention was completed.

[0010] In other words, the present invention is a terrestrial gastropod repellent sheet characterized by having a coating layer on one side of a sheet-like substrate, containing terpenes as an active ingredient in the coating layer, and having a water contact angle of 80° or more in the coating layer. [Effects of the Invention]

[0011] The repellent sheet of the present invention uses terpenes as an active ingredient, which are safer than paraformaldehyde and metaldehyde, which have been used conventionally. The terpenes exhibit a repellent effect on terrestrial gastropods such as slugs and snails, and by adjusting the water contact angle of the coating layer to 80° or more, the crawling of terrestrial gastropods that secrete mucus is inhibited. These factors work together to exhibit an excellent repellent effect against terrestrial gastropods. Furthermore, terpenes are less likely to leach out due to watering or rainfall, and there is less accumulation of organic matter on the surface, so the surface is constantly renewed, and the repellent effect against terrestrial gastropods is maintained for a long period of time. In addition, its sheet-like form makes it convenient to wrap around flowerpots or plant stems, or to place under flowerpots or planters. Furthermore, by providing an adhesive layer on the side opposite the coated layer of the sheet-like substrate, it becomes easier to fix it in the desired location, further improving its convenience. [Modes for carrying out the invention]

[0012] The present invention will be described in detail below. The present invention relates to a terrestrial gastropod repellent sheet having a coating layer on one side of a sheet-like substrate, containing terpenes as an active ingredient in the coating layer, and having a water contact angle of 80° or more in the coating layer.

[0013] Sheet-like substrates refer to planar products such as films, sheets, tapes, boards, paper, nonwoven fabrics, woven fabrics, knitted fabrics, and nets, and any material, structure, or other characteristics are acceptable as long as it is in sheet form. Preferred materials include readily available industrial plastic sheets with a good balance of properties and cost, such as PET (polyethylene terephthalate), PP (polypropylene), PE (polyethylene), EVA (ethylene-vinyl acetate copolymer), PC (polycarbonate), PVC (polyvinyl chloride), PMMA (polymethyl methacrylate), COP (cycloolefin polymer), PA (polyamide), and PLA (polylactic acid). Particularly preferred materials include PET, PP, and PE, in terms of strength, elastic modulus, cost, weather resistance, and solvent resistance during coating. The thickness depends on the elastic modulus of the substrate, but for example, 15-80 μm for PET, 25-100 μm for PP, and 50-200 μm for PE are easy to process and practically handle.

[0014] In the present invention, a coating layer is provided on one side of the sheet-like substrate, and the coating layer contains one or more types of terpenes. While there are no particular restrictions on the terpenes used, suitable terpenes include monoterpenes with 10 carbon atoms and sesquiterpenes with 15 carbon atoms.

[0015] Examples of monoterpenes include monoterpene hydrocarbons such as α-pinene, myrcene, limonene, β-pinene, camphor, sapinene, fillandrene, paradimene, ocimene, and terpinene; monoterpene alcohols such as linalool, geraniol, menthol, terpinen-4-ol, bisapolol, phenylethanol, citronellol, nerol, terpineol, borneolol, and hinokitiol; and terpene aldehydes such as citronellal, geranial, and neral. Among these, geranyl diphosphate (GPP), a linear isoprenoid with 10 carbon atoms, is a precursor to many monoterpenes. A group of monoterpenes biosynthesized via menthane, which is formed by the cyclization of a cation generated from its isomer, linalyl diphosphate (LPP), is particularly suitable. Specifically, examples include camphor, borneolol, α-pinene, limonene, and l-menthol.

[0016] Examples of sesquiterpenes include sesquiterpene hydrocarbons such as β-elemene, γ-muurolene, α-selinene, zingiberene, vetivene, cazmalene, β-caryophyllene, β-fernesene, valencene, bisaolene, cedrene, and cadinene, as well as sesquiterpene alcohols such as nerolidol, cedrol, bergamotene, carodol, farnesol, nardol, santalol, patchouli alcohol, phenylethyl alcohol, emolol, cadinol, and muurolol. Farnesilyl diphosphate (FPP), a precursor of sesquiterpenes, has 15 carbon atoms and consists of three isoprene units. It generates numerous cyclic structures through various ring-closing reactions, but in the present invention, monocyclic and bicyclic sesquiterpenes are particularly preferred. A typical example of a monocyclic sesquiterpene is zingiberene, a component of ginger essential oil. Typical examples of bicyclic sesquiterpenes include cadinene, found in a wide range of plants that produce essential oils, including pine and cedar; califorene, found in clove essential oil; and vetivebazulene and guaiazulene, which contain unsaturated bonds.

[0017] Terpenes are widely found in plants, but the types of terpenes present vary depending on the plant. When extracted as essential oil, the oil contains a mixture of several terpenes, but certain plants often contain specific terpenes characteristically. For example, pine contains pinene, cypress and hinoki contain hinokitiol, peppermint contains menthol, camphor contains camphor, citrus fruits contain D-limonene, copaiba contains calophyllene, Japanese pepper contains β-phellandrene, celery contains β-selinene, sage contains cinere, thyme contains p-cymene, nutmeg contains β-pinene, and vanilla contains vanillin. While it is desirable to isolate and use the desired terpenes from the essential oil, this is cost-inefficient, so it is also possible to use essential oils that contain a relatively large amount of the desired terpenes as they are.

[0018] The content of the above-mentioned terpenes in the coating layer is not particularly limited, but is preferably 0.05 to 10% by mass, and more preferably 0.1 to 8% by mass, based on the total weight of the coating layer after drying and curing. If the content of terpenes in the coating layer is too low, a sufficient repellent effect against terrestrial gastropods may not be obtained, and if the content is too high, bleeding or stickiness of the surface may occur, or the strength of the coating layer may be insufficient, resulting in defects such as cracks or insufficient strength.

[0019] Furthermore, the coated layer after drying and curing must have a surface property of a water contact angle of 80° or more, preferably 90° or more, and more preferably 100° or more. The water contact angle can be measured by the method described in the examples. Examples of base materials used in the coating layer include acrylic resins, polyester resins, polyurethane resins, alkyd resins, epoxy resins, silicone resins, silicone-modified acrylic resins, fluororesins, and ionomers. The solvent for diluting the above base as required can widely use solvents commonly used in normal coating, and is selected considering the solubility of the base and additives, solvent attack on the sheet-like substrate, drying time, pot life, etc. Generally, ethyl acetate, propyl acetate, butyl acetate, dimethyl ethyl ketone, methyl ethyl ketone, methyl isobutyl ketone, dimethyl ether, tetrahydrofuran, toluene, xylene, ethanol, propanol, methyl cellosolve, etc. are preferably used. These base, solvent, terpenes, etc. are mixed to prepare a coating liquid. The content of the base in the coating liquid generally depends on the types of the base and the solvent, but is generally 5 to 70% by mass, preferably 10 to 60% by mass.

[0020] After the coating liquid is applied to the sheet-like substrate, the solvent is volatilized, cured, etc. to form a coating layer. A crosslinking reaction can be carried out using a curing agent to form a stronger coating layer, or a UV or electron beam curable base can also be used for the same purpose. In the present invention, as the wettability of the surface of the coating layer after drying and curing, the contact angle of water is 80° or more, preferably 90° or more, more preferably 100° or more, and the base, additives, terpenes, etc. are selected accordingly.

[0021] Regarding the base, by selecting a highly hydrophobic one, the contact angle of water of the coating layer after curing can be increased. For example, by using a polyester resin having a long-chain alkylene group with 8 to 12 carbon atoms in the molecule such as 1,8-octanediol, 1,9-nonanediol, 1,10-decanediol, 1,12-dodecanediol, a polyurethane resin having a long-chain alkylene group in the molecule, a silicone resin, a silicone-modified acrylic resin, a fluorine-based resin, etc., the contact angle of water can usually be 80° or more.

[0022] When using a base material with a water contact angle of less than 80° by itself, the water contact angle can be increased by adding a water contact angle improver such as paraffin, fats and oils, for example, a low HLB hydrocarbon surfactant with an HLB of about 1.0 to 7.0, a fluorine-based compound, or silicone oil to the coating layer composition. The addition amount of the water contact angle improver depends on the type of the base material and the type of the water contact angle improver. However, it is preferably 0.05 to 3% by mass, more preferably 0.1 to 2% by mass, based on the coating layer after drying and curing. If it is below this range, the effect of improving the contact angle may not be obtained. If it exceeds this range, the coating layer may become sticky or may overly cover the outermost surface of the coating layer, reducing the repellent effect.

[0023] Regarding the type of the base material, an aspect of the preferable addition amount range of the water contact angle additive is as follows. In the case of a base material having a certain degree of hydrophilicity such as an acrylic resin, a polyester resin, a polyurethane resin, an alkyd resin, or an epoxy resin, the addition amount of the water contact angle improver is preferably about 0.1 to 3% by mass based on the coating layer after drying and curing. In the case of a highly hydrophobic base material such as a polyester resin having a long-chain alkylene group in the molecule, a polyurethane resin having a long-chain alkylene group in the molecule, a silicone resin, a silicone-modified acrylic resin, or a fluorine-based resin, 0 to 0.5% by mass is preferable.

[0024] The water contact angle can also be increased depending on the type and content of terpenes. For example, when using terpenes having a polar functional group in the molecule or few oxygen and nitrogen atoms, the contact angle becomes high. Specifically, as monoterpenes, myrcene, pinene, and limonene can be mentioned, and as sesquiterpenes, β - elemene, δ - cadinene, etc. are exemplified.

[0025] The terrestrial gastropod repellent sheet of the present invention can be produced, for example, as follows. (1) Coating liquid preparation step A coating solution is prepared by mixing a base, a solvent, one or more types of terpenes, and additives as needed. After removing the solvent that evaporates during the drying process, the amount of terpenes is adjusted to preferably 0.05 to 20% by mass, more preferably 0.1 to 10% by mass, relative to the total weight of the base and any non-volatile additives added as needed, such as water contact angle modifiers, crosslinking agents, plasticizers, lubricants, stabilizers, dispersants, pigments, fillers, etc.

[0026] (2) Coating and drying process To apply the coating solution prepared in step (1) above to the sheet-like substrate, a known coating method can be used. The coating method should be appropriately selected depending on the material and properties of the sheet-like substrate and the viscosity and properties of the coating solution. Examples include the knife coater method, bar coater method, gravure coater method, reverse roll coater method, kiss coater method, comma coater method, and dip coater method. From an industrial standpoint, considering coating accuracy and productivity, the gravure coater method is preferable. Furthermore, to prevent uneven coating and repelling, depending on the material of the sheet-like substrate, corona treatment, atmospheric pressure plasma treatment, flame treatment, or pre-adhesive coating may be applied. For PET film and OPP film, commercially available grades with in-line easy-adhesive coating are also available. In this way, the sheet-like substrate coated with the coating solution is dried according to a conventional method to evaporate the solvent, thereby forming a coating layer on the sheet-like substrate. The amount of coating is preferably controlled by the thickness of the coating layer after solvent drying and curing. The thickness of the coating layer is usually set in the range of 1 to 100 μm, with 5 to 30 μm being preferable. If the thickness of the coating layer is below this range, the content of terpenes, which are repellents, may be insufficient, resulting in inadequate repellent effect or insufficient duration of repellency. On the other hand, if it exceeds this range, it may be over-specified, resulting in cost disadvantages, or the coating layer may peel off, crack, or whiten.

[0027] (3) Adhesive layer coating process In this invention, an adhesive layer may be provided on the other side of the sheet-like substrate as needed. The adhesive is not particularly limited in type. Acrylic, silicone, urethane, rubber, etc., can be used without restriction, but acrylic adhesives, which offer a good balance of processability and practical properties, are preferably used. Regarding the coating method, while there are no particular restrictions on the method, including the hot melt method and the calendering method, depending on the properties of the adhesive, methods that involve applying the adhesive diluted with a solvent using a roll knife coater, gravure coater, etc., are industrially advantageous. When the repellent sheet of the present invention is to be adhered to rough surfaces such as walls, concrete, asphalt, and gravel, it is necessary to apply an adhesive layer thickly, 30 to 100 μm or more. In such cases, it is preferable to directly coat the film with a hot melt adhesive using a die coater. A method can also be employed in which UV crosslinking sites are incorporated into the molecules of the adhesive, and the adhesive is cured by UV irradiation after coating. The ideal thickness of the adhesive layer is usually 10 to 50 μm. If it is thinner than this range, the adhesive performance will not develop properly, and if it is thicker, a so-called "telescope" phenomenon may occur, where the sheet material is wound onto a paper tube together with the adhesive layer, causing misalignment in the thickness direction. As mentioned above, when the purpose is adhesion to rough surfaces, a thickness of 100 μm or more may be used, while paying attention to the "telescope" phenomenon. After forming the adhesive layer, the sheet-like substrate is either wound up as is, or a release film is applied to the adhesive surface before winding the sheet onto a paper tube and cutting it to the desired width and length. Furthermore, instead of directly applying the adhesive layer to the sheet-like substrate, a method is often employed in which the adhesive is applied to the release film, the release film and one side of the sheet-like substrate are laminated together, and the adhesive layer is transferred to the sheet-like substrate. [Examples]

[0028] The terrestrial gastropod repellent sheet according to the present invention will be described in detail in each example below, but the present invention is not limited in any way by these examples. In the examples, % refers to mass %.

[0029] Example 1 As the sheet substrate, a 50 μm thick Toray Industries Lumirror T-60 (PET film) was prepared, and as the base and solvent, Nippon Paint's 1-component Fine Urethane 100 was used. The base concentration calculated from the thickness after coating was 60%. Fine Urethane 100 was coated with 0.6% hinokitiol (manufactured by Kisei Tech Co., Ltd.) as a terpene (calculated as the dry coating layer) and 0.2% silicone oil KF96 (manufactured by Shin-Etsu Chemical Co., Ltd.) as a water contact angle modifier. Using an applicator, the coating was applied to an A4-sized PET film to a thickness of 20 μm including the solvent. The coating was then dried in a hot air dryer at 60°C for 1 hour to evaporate the solvent. The thickness of the dried coating layer was 12 μm. The water contact angle, slug repellency rate, and retention rate of repellency after watering were measured on the obtained sheet using the method described below. The results are shown in Table 1.

[0030] <Measuring the contact angle of water> Using a DMo-701 contact angle meter manufactured by Kyowa Interface Science Co., Ltd., approximately 1 μL of distilled water was dropped onto the coating surface under an atmosphere of 25°C and 55% RH, and the angle between the droplet and the coating surface after 10 seconds was calculated using the θ / 2 method. <Measurement of repellency rate> A 10cm square plastic sheet substrate was coated using a small tabletop applicator manufactured by Allgood Co., Ltd., and dried under specified conditions. One slice of cucumber (food) was placed on each of the 20 coated plastic sheets, and they were placed in a breeding case that could hold 40 slugs. The 20 sheets were used continuously for 5 days, and the cucumber food was replaced daily. We observed how many cucumbers slugs ate in total over five days after crawling across a sheet coated with a repellent and reaching cucumbers. Since slugs only eat the center of the cross-section of a sliced ​​cucumber, the effectiveness of the repellent could be easily determined by whether or not a hole was made in the center. The repellency rate (%) was defined as the number of cucumbers that were not eaten out of a total of 100 cucumbers. A repellency rate of 70% or higher in this measurement is considered practically desirable. <Measurement of retention rate of repellent effect by watering> Using the method described above, the plastic sheets whose repellency rate was measured were sprayed with water at a rate of 1 liter per minute for 10 minutes using a household water shower. Three months later, the repellency rate was measured again, and the retention rate of the repellency rate was measured using the following formula. Retention rate after watering (%) = Repellency rate after watering / Repellency rate before watering × 100 Assuming a repellency rate of 70% or higher, it is considered practically desirable for the retention rate of the repellency rate after watering in this measurement to be 60% or higher.

[0031] Example 2 A repellent sheet was prepared by coating in the same manner as in Example 1, except that 0.1% of Shin-Etsu Chemical's silicone oil KP-341 was added as a water contact angle modifier (calculated on the dry coating layer) instead of Shin-Etsu Chemical's silicone oil KF96. The water contact angle, slug repellency rate, and retention rate of the repellency rate after watering were measured. The results are shown in Table 1.

[0032] Example 3 A repellent sheet was prepared by coating in the same manner as in Example 1, except that 0.1% of Shin-Etsu Chemical's silicone oil KF-351A was added as a water contact angle modifier (calculated on the dry coating layer) instead of Shin-Etsu Chemical's silicone oil KF96. The water contact angle, slug repellency rate, and retention rate of the repellency rate after watering were measured. The results are shown in Table 1.

[0033] Comparative Example 1 A repellent sheet was prepared by coating it in the same manner as in Example 1, except that silicone oil was not added. The water contact angle, slug repellency rate, and retention rate of the repellency rate after watering were measured. The results are shown in Table 1.

[0034] Comparative Example 2 A repellent sheet was prepared by coating it in the same manner as in Example 1, without adding hinokitiol and silicone oil, and the water contact angle, slug repellency rate, and retention rate of the repellency rate after watering were measured. The results are shown in Table 1.

[0035] Comparative Example 3 Without a coating layer, the water contact angle, slug repellency rate, and retention rate of repellency after watering were measured using only the PET film. The results are shown in Table 1.

[0036] [Table 1]

[0037] As shown in Table 1, when comparing Examples 1-3 with Comparative Examples 1-3, there were significant differences in the slug repellency rate and the retention rate of the repellency rate after watering. This revealed that by adding a predetermined amount of terpenes and creating a coating layer with a water contact angle of 80° or more, an excellent repellent effect against terrestrial gastropods and its sustained effect can be obtained.

[0038] Examples 4-5 and Comparative Example 4 As a sheet-like substrate, a 50 μm thick Toray Industries Lumirror T-60 (PET film) was used. Toyo Ink Co., Ltd.'s silicone-modified acrylic resin DYPC S-110 and hardener UR300B varnish were used as the base and solvent in a ratio of 100 / 20 (solid content concentration 28%). Camphor from Senshoku Kodama Co., Ltd. was added as a terpene in the amount shown in Table 2 (calculated as the coated layer after drying) and mixed to prepare a coating solution. Using an applicator, the solution was applied to an A4-sized PET film to a thickness of 20 μm including the solvent. After that, it was dried in a hot air dryer at 80°C for 30 minutes to evaporate the solvent and prepare a repellent sheet. The thickness of the coated layer after drying was 6 μm. The water contact angle, slug repellency rate, and retention rate of repellency after watering were measured in the same manner as above. The results are shown in Table 2.

[0039] [Table 2]

[0040] Table 2 confirms that the repellent effect against slugs increases depending on the terpene content in the coating layer.

[0041] Example 6 and Comparative Examples 5-6 As a sheet substrate, a 25 μm thick Santonil (PA film) manufactured by Mitsubishi Chemical Corporation was used. As the base and solvent, DYPC S-110 silicone-modified acrylic resin manufactured by Toyo Ink Co., Ltd. and UR300B varnish as a hardener were used in a 100 / 20 ratio (solid content concentration 28%). As terpenes, 1.0% of reagent δ-cadinene manufactured by Tokyo Chemical Industry Co., Ltd., a sesquiterpene hydrocarbon, and 0.5% of SF Coat (fluorine-based compound) manufactured by AGC Corporation were added to prepare a coating solution. Using an applicator, the solution was applied to an A4 size PA film to a thickness of 20 μm including the solvent. After that, it was dried in a hot air dryer at 80°C for 30 minutes to evaporate the solvent and prepare a repellent sheet. The thickness of the coating film was 12 μm. The δ-cadinene content in the coating layer was 3.6%. In the same manner as described above, the water contact angle, slug repellency rate, and retention rate of the repellency rate after watering were measured. The results are shown in Table 3. Furthermore, as Comparative Example 5, only uncoated PA film was measured, and as Comparative Example 6, a sheet coated in the same manner as in Example 6 except that δ-cadinene was not added was also measured. The results are shown in Table 3.

[0042] [Table 3]

[0043] The repellent sheet of Example 6 showed excellent repellent effects against snails, and it was confirmed that its effectiveness did not decrease even when watered.

[0044] Based on the above, it has been shown that the terrestrial gastropod repellent sheet according to the present invention has an excellent repellent effect against slugs, snails, and the like, and that the effect is also highly durable. [Industrial applicability]

[0045] According to the present invention, it is possible to provide a terrestrial gastropod repellent sheet that is highly safe because it uses a repellent derived from natural products, has good repellent effect against slugs and snails, does not release the repellent when watering plants, does not cause accumulation of hydrophilic organic matter, has a long-lasting repellent effect, and is convenient to use as it is in the form of a sheet.

Claims

1. A coating layer is provided on one side of a sheet-like substrate, and the coating layer contains terpenes as active ingredients, wherein the terpenes are monoterpenes and / or sesquiterpenes, and the monoterpenes are one or more selected from the group consisting of α-pinene, myrcene, limonene, β-pinene, camphor, sapinene, fillandrene, paradimene, ocimene, terpinene, linalool, geraniol, menthol, terpinen-4ol, bisapolol, phenylethanol, citronellol, nerol, terpineol, borneolol, hinokitiol, citronellal, geranial and neral, sesquiterpenes A terrestrial gastropod repellent sheet characterized in that the kiterpenes consist of one or more selected from the group consisting of β-elemene, γ-muurolene, α-selinene, zingiberene, vetiveone, kazmalene, β-caryophyllene, β-fernesene, valensene, bisaolene, cedrene, cadinene, nerolidol, cedrol, bergamotene, carodol, farnesol, nardol, santalol, patchouli alcohol, phenylethyl alcohol, emollol, cadinol, muurolol, califolene, vetivebazulene, and guaiazulene, and the water contact angle of the coating layer is 80° or more.

2. The terrestrial gastropod repellent sheet according to claim 1, wherein the content of terpenes in the coating layer is 0.05 to 10% by mass.

3. The terrestrial gastropod repellent sheet according to claim 1, wherein the terrestrial gastropod is a slug or a snail.

4. The terrestrial gastropod repellent sheet according to claim 1, wherein the sheet-like base material is a film or sheet of synthetic resin selected from the group consisting of PET (polyethylene terephthalate), PP (polypropylene), PE (polyethylene), EVA (ethylene-vinyl acetate copolymer), PC (polycarbonate), PVC (polyvinyl chloride), PMMA (polymethyl methacrylate), COP (cycloolefin polymer), PA (polyamide), and PLA (polylactic acid).

5. The terrestrial gastropod repellent sheet according to claim 1, wherein the coating layer contains a resin selected from the group consisting of polyester resins, polyurethane resins, silicone resins, silicone-modified acrylic resins, and fluororesins having long-chain alkylene groups in the molecule, as a base component.

6. A repellent sheet for terrestrial gastropods according to claim 1, wherein an adhesive layer is provided on the side opposite to the coating layer of the sheet-like substrate.

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