Phenyl salicylate and benzyl salicylate as acaricidal agents

Abstract

Acaricides characterized by containing at least one member selected from phenyl salicylate, diphenylamine, methyl .beta.-naphtyl ketone, coumarin, phenethyl benzoate, benzyl salicylate, N-fluorodichloromethyl-thio-cyclohexene-dicarboxyimide, p-nitrobenzoic acid methyl ester, p-chlorometaxylenol, .alpha.-bromocinnamic aldehyde, 2,5-dichloro-4-bromophenol, N,N-dimethyl-N'-tryl-N'-(fluorodichloromethylthio)-sulfamide, 2-phenyl-phenol, sodium 2-phenyl-phenolate, 5-chloro-2-methyl-4-isothiazoline-3-one, 2-methyl-4-isothiazoline-3-one and benzimidazolyl methyl-carbamate as an active ingredient.

Description

TECHNICAL FIELD

The present invention relates to new acaricides and mite proof materials.

BACKGROUND ART

There are certainly some kinds of mites in a house dust of general houses and in recent years, frequent breeding of mites has been observed according to change of houses and life style. Hitherto, there have been known some kinds of acaricides for mites in a house dust, for example, phosphorated compounds such as phenitrothione, phenthione, DDVP and diazinon, carbamated compounds such as propoxer and NAC and the pyrethroided compounds such as dl,d-T80-resmethrin.

These known acaricides, which are used by being supported in a tatami, a carpet or an insect control paper or scattered or sprayed as they are, have such problems as the following: the acaricides of phosphorated compounds have high toxicity, bad smell and low effect on Epidermoptidae, those of carbamated compounds also have high toxicity and low effect on Epidermoptidae, those of pyrethroided compounds are expensive and have low effect on Tyrophagus putrescentiae, and it is difficult to use the above acaricides in combination with one another.

DISCLOSURE OF THE INVENTION

As a result of various studies for providing an inexpensive acaricide having low toxicity and wide range of prevention of mites in a house dust, the following compounds are found to satisfy the above conditions: phenyl salicylate, diphenylamine, methyl .beta.-naphthyl ketone, coumarin, phenetyl benzoate, benzyl salicylate, N-fluorodichloromethyl-thio-cyclohexene-dicarboxyimide, p-nitrobenzoic acid methyl ester, p-chlorometaxylenol, .alpha.-bromocinnamic aldehyde, 2,5-dichloro-4-bromophenol, N,N-dimethyl-N'-tryl-N'-(fluorodichloromethylthio)-sulfamide, 2-phenyl-phenol, sodium 2-phenyl-phenolate, 5-chloro-2-methyl-4-isothiazoline-3-one, 2-methyl-4-isothioazoline-3-one and benzimidazolyl methyl-carbamate.

Thus, the present invention relates to acaricides characterized by containing at least one member selected from N-fluorodichloromethyl-thio-cyclohexene-dicarboximide, p-nitrobenzoic acid methyl ester, p-chlorometaxylenol, .alpha.-bromocinnamic aldehyde, phenyl salicylate, phenyl benzoate, diphenylamine, methyl .beta.-naphthyl ketone, coumarin, phenethyl benzoate, benzyl salicylate, 2,5-dichloro-4-bromophenol, N,N-dimethyl-N'-tryl-N'-(fluorodichloromethylthio)-sulfamide, 2-phenylphenol, sodium 2-phenyl-phenolate, 5-chloro-2-methyl-4-isothiazoline-3-one, 2-methyl-4-isothiazoline-3-one and benzimidazolyl methyl-carbamate as an active ingredient and mite proof materials characterized by supporting these acaricides in substrates.

BEST MODE FOR CARRYING OUT THE INVENTION

The acaricides of the present invention have superior effects on prevention of mites by containing at least one member selected from N-fluorodichloromethylthio-cyclohexene-dicarboximide (NFC), p-nitrobenzoic acid methyl ester (NBA), p-chlorometaxylenol (PCMX), .alpha.-bromocinnamic aldehyde (BCA), phenyl salicylate (PS), phenyl benzoate (PB'), diphenylamine (DA), methyl .beta.-naphthyl ketone (MNK), coumarin (CM), benzyl salicylate (BS), phenetyl benzoate (PB), 2,5-dichloro-4-bromophenol (CBP), N,N-dimethyl-N'-tryl-N'-(fluorodichloromethylthio)-sulfamide (TFS), 2-phenyl-phenol (OPP), sodium 2-phenyl-phenolate (SPP), 5-chloro-2-methyl-4-isothiazoline-3-one (CIO), 2-methyl-4-isothiazoline-3-one (MIO) and benzimidazolyl methyl-carbamate (BIC).

The acaricides can be applicable to any kind of mites existing in a house. Further, particular examples of the mites to which the acaricides are applicable are Epidermoptidae such as Dermatophagoides farinae and Dermatophagoides pteronyssinus, Acaridae such as Tryophagus putrescentiae and Aleuroglyphus ovatus, Glycyphagidae such as Glycyphagus privatus and Glycyphagus domesticus, Tarsonemidae, Cheyletidae such as Cheyletus malaccensis and Cheyletus fortis and animal paracitic mites such as Ornithonyssus bacoti and Ornithonyssus sylviarum.

When the acaricides of the present invention are employed, the compositions containing the above-mentioned active ingredients can be used as they are. Usually, they are used in the form of solution, emulsion, wettable powder, spray, aerosol, fumigant, paint, dust, granule or the like by supporting the compositions containing the active ingredients in a liquid or solid type support, and if necessary, by adding thereto film-coating agent, emulsifying agent, dispersion agent, spreader, moistening agent, stabilizer, propellant, volatile-controlling agent and the like.

Examples of the above-mentioned liquid type support are, water, alcohols such as methyl alcohol, ethyl alcohol and isopropyl alcohol, ketones such as acetone, methyl ethyl ketone and cyclohexanone, ethers such as tetrahydrofurane, dioxane and dimethyl ether, aliphatic hydrocarbons such as hexane, kerosine, normal paraffin and solvent naphtha, aromatic hydrocarbons such as benzene and toluene, halogenated hydrocarbons such as dichloromethane and dichloroethane, esters such as ethyl acetate and butyl acetate, and the like. Examples of the above-mentioned solid type support are mineral powders such as silicic acid, kaolin, active carbon, bentonite, diatomaceous earth, talc, clay, calcium carbonate and ceramic powder, vegetable powders such as wood powder, soybean powder, flour and starch and inclusion compounds such as cyclodextrin.

Examples of the above-mentioned film-coating agent are cellulose derivatives, vinyl resin, alkyd resin, urea resin, epoxy resin, polyester resin, urethane resin, silicone resin, acrylic resin, gum chloride, polyvinyl alcohol and the like. Examples of the above-mentioned emulsion, dispersion and spreader are soaps and surface active agents such as polyoxyethylene aliphatic alcohol ether, polyoxyethylene alkylallyl ether, polyoxyethylene fatty acid ester, fatty acid glyceride, sorbitan fatty acid ester, ester sulfate of higher alcohol and alkylarylsulfonate. Further, examples of the above-mentioned propellant are liquefied petroleum gas, dimethyl ether, fluorocarbon and the like. Examples of the volatile-controlling agents are sublimate support such as tricyclodecane, cyclododecane, 2,4,6-triisopropyl-1,3,5-trioxan and trimethylenenorbornane, sublimate insecticide such as p-dichlorobenzene, naphthaline and camphor. The above-mentioned acaricides may be used as a sublimate solid acaricide in combination with the above sublimate support or sublimate insecticide and also may be used as a volatile acaricide in combination with volatile insecticide such as empethrin and DDVP.

Furthermore, it is possible to combine various kinds of insecticide, synergist, harmful insect repellent, mouse repellent, antioxidant, antidecomposition, bactericide, fungicide, perfume, colaring agent and the like with the acaricides of the present invention. Every kind of insecticides which has been employed to exterminate vermin can be combined with these acaricides. The typical examples are 3-allyl-2-methylcyclopenta-2-ene-4-one-1-yl dl-cis/trans-chrysanthemate, 3-allyl-2-methycyclopenta-2-ene-4-one-1-yl d-cis/trans-chrysanthemate, d-3-allyl-2-methylcyclopenta-2-ene-4-one-1-yl d-trans-chrysanthemate, 3-allyl-2-methylcyclopenta-2-ene-4-one-1-yl d-trans-chrysantemate, N-(3,4,5,6-tetrahydrophthalimide)-methyl dl-cis/trans-chrysanthemate, (5-benzyl-3-furyl)methyl d-cis/trnas-chrysanthemate (hereinafter referred to as "AA"), [5-(2-propargyl)-3-furyl]methyl chrysanthemate, 3-phenoxybenzyl, 2,2-dimethyl-3-(2',2'-dichlorovinyl)cyclopropanecarboxylate, 3-phenoxybenzyl d-cis/trans-chrysanthemate, .alpha.-cyanophenoxybenzyl isopropyl-4-chlorophenyl acetate, d-3-allyl-2-methylcyclopenta-2-ene-4-one-1-yl d-trans-chrysanthemate, (S)-.alpha.-cyano-3-phenoxybenzyl (IR.cis)-3-(2,2-dichlorovinyl)-2,2-dimethylcyclopropanecarboxylate, (R,S)-.alpha.-cyano-3-phenoxybenzyl (1R.1S)-cis/trans-3-(2,2-dichlorovinyl)-2,2-dimethylcyclopropanecarboxylate, .alpha.-cyano-3-phenoxybenzyl d-cis/trans-chrysanthemate, 1-ethynyl-2-methyl-2-pentenyl cis/trans-chrysanthemate, 1-ethynyl-2-methyl-2-pentenyl 2,2-dimethyl-3-(2-methyl-1-propenyl)cyclopropane-1-carboxylate, 1-ethynyl-2-methyl-2-pentenyl 2,2,3,3-tetramethylcyclopropanecarboxylate, 1-ethynyl-2-methyl-2-pentenyl 2,2-dimethyl-3-(2,2-dichlorovinyl)cyclopropane-1-carboxylate, O,O-dimethyl O-(2,2-dichlorovinyl)phosphate, O-isopropoxyphenyl methyl carbamate, O,O-dimethyl O-(3-methyl-4-nitrophenyl)thionophosphate, O,O-diethyl O-2-isopropyl-4-methylpyrimidyl-(6)-thiosphophate (hereinafter referred to as "AB"), O,O-dimethyl S-(1,2-dicarboethoxyethyl)dithiophosphate, isobornyl thiocyanate (hereinafter referred to as "AC") and the like.

The amount of the active ingredients in the acaricides of the present invention may be optionally determined according to its dossage form, its applying manner and place and the like. In case of using the acaricides in the form of wettable powder or emulsion, the preferable concentration of the compositions having active ingredients is from 0.1 to 50% by weight. In case of using acaricides in the form of oil or aerosol, the preferable concentration of the compositions having active ingredients is from 0.1 to 30% by weight. The preferable amount of the compositions having active ingredients to the area or the space to be treated is more than about 20 mg per 1 m.sup.2 or more than about 2 mg per 1 m.sup.3 respectively.

The present invention also provides mite proof materials which support the above-mentioned acaricides in substrates. The mite proof materials are used as films, sheets, building materials and the like having the property of prevention of mites according to the characteristics of the substrates. Examples of the substrates are synthetic resin sheets such as polyethylene, polypropylene, nylon, polyvinyl chloride, polyvinylidene chloride, polyester, the sheets made of animal, vegetable or inorganic fiber (papers, fabrics, non-woven fabrics, leathers and the like), sheets or blended fabrics made of these synthetic resin and inorganic fiber or powder, blended or non-woven fabrics made of the above synthetic resin and animal or vegetable fiber, metal foils or films such as alminum, stainless, zinc and the laminated sheets consisting of some of the above-mentioned sheets. Other examples are natural wood for building materials such as paulownia, pencil cedar, comphor tree and the like and plastics, for instance, moldings of vinyl chloride resin, chlorinated polyethylene, polyethylene, polypropylene and the like. There is no particular limitation of supporting means of the acaricides of the present invention in these substrates and it is possible to use means such as painting, impregnating, dropping and kneading. The held amount is not particularly limited and can be optionally determined. In case of impregnating the acaricides into substrates, the amount by which substrates are saturated is preferable.

One of the preferable examples of the mite proof materials of the present invention is one in the form of carpet. It can be obtained as follows: one procedure is to spray-coat the acaricides of the present invention in the form of solution on the right side and (or) the other side of usual carpets which are made of pile, base cloth, backing agent and lining cloth, another is, before making the above carpets, to knead the acaricides of the present invention into one or some of pile, base cloth and lining cloth and then make a carpet, and the other is to mix the acaricides of the present invention with a backing agent and make a carpet using the agent according to pre-coating method or jute-lining method.

The pre-coating method mentioned above is to paint the backing agent on base cloth in order to fix the pile and afterward paint again the backing agent there in order to adhere lining cloth on it. The jute-lining method is to paint the backing agent on base cloth interwoven with pile and afterward adhere lining base on it. It is usually preferable for the mite proof carpets made by the methods memtioned above to support about 0.5 to 200 g of the compositions having active ingredients per 1 m.sup.2 of the carpets.

As mentioned above, the acaricides of the present invention provide a superior effect when directly applied to tatami, carpet, floor, corridor, mattress, sofa, bedding such as futon or pillow, closet, furniture, storehouse and the like by means of setting, dusting, spraying, painting, aerosolizing and heat vaporization or set mite proof materials which support the acaricides in substrates in the above-mentioned places.

The present invention is more specifically described and explained by means of the following Examples.

EXAMPLE 1

[Effect on Dermatophagoides farinae]

An acetone solution of a test sample was impregnated into a black fine paper (5.times.5 cm) so as to contain the predetermined amount of active ingredients.

After removing the solvent, this paper was put into a polyethylene bag (6.times.6 cm) with about three hundred of mites and then the four sides of it were closed. 48 hours later, the number of living mites was counted under a stereomicroscope. Mortality was calculated by means of Abott revision method shown in the formula below. The results are shown on Table 1. ##EQU1## X: percentage of living mites in untreated group Y: percentage of living mites in treated group.

TABLE 1__________________________________________________________________________ Mortality (%) Amount of active Amount of activeExperiment Name of test samples ingredient ingredientNo. (mixed ratio by weight) (0.5 g/m.sup.2) (0.1 g/m.sup.2)__________________________________________________________________________1 NFC 100 1002 NBA 100 533 PCMX 97 434 BCA 100 495 NFC/NBA(1/1) 100 1006 NFC/PCMX(1/1) 100 957 NFC/BCA(1/1) 100 928 NFC/NBA/PCMX(1/1/1) 100 1009 NFC/NBA/BCA(1/1/1) 100 10010 NBA/PCMX/BCA(1/1/1) 100 5111 NFC/NBA/PCMX/BCA(1/1/1/1) 100 9212 PS 100 6313 PB 100 5614 DA 100 4715 MNK 100 4216 CM 100 4117 PS/PB(1/1) 100 6518 PS/DA(1/1) 100 5719 DA/MNK(1/1) 100 4220 MNK/CM(1/1) 100 4221 PS/PB/DA(1/1/1) 100 5422 PS/PB/MNK(1/1/1) 100 5723 PS/DA/MNK(1/1/1) 100 5024 PS/MNK/CM(1/1/1) 100 4325 PS/PB/DA/MNK(1/1/1/1) 100 5326 PS/PB/DA/CM(1/1/1/1) 100 5027 PS/PB/DA/MNK/CM(1/1/1/1/1) 100 4828 PB 100 4529 CBP 100 4030 TFS 100 6431 BIC 60 4132 OPP/SPP(1/1) 100 6833 CIO/MIO(1/1) 100 4234 CBP/TFS(1/1) 100 6135 CBP/BIC(1/1) 100 4036 CBP/SPP(1/1) 100 6337 CBP/CIP/MIO(1/1/1) 100 4238 CBP/TFS/BIC(1/1/1) 100 5339 TFS/OPP/SPP(1/1/1) 100 6540 TFS/CIO/MIO(1/1/1) 100 5741 BIC/OPP/SPP(1/1/1) 100 5942 BIC/CIO/MIO(1/1/1) 100 4143 CBP/TFS/OPP/SPP(1/1/1/1) 100 5744 CBP/TFS/CIO/MIO(1/1/1/1) 100 4545 CBP/BIC/OPP/SPP(1/1/1/1) 100 5346 CBP/BIC/CIO/MIO(1/1/1/1) 100 4247 CBP/TFS/BIC/OPP/SPP(1/1/1/1/1) 100 5248 CBP/TFS/BIC/CIO/MIO(1/1/1/1/1) 100 4049 CBP/TFS/BIC/OPP/SPP/CIO/MIO(1/1/1/1/1/1/1) 100 48Reference dl,d-T80-resmethrin 51 38example__________________________________________________________________________

While it had been known that dl,d-T80-resmethrin was effective on Dermatophagoides farinae, the acaricides of the present invention had an equivalent effect to or a more effect than dl,d-T80-resmethrin.

EXAMPLE 2

[Effect on Tyrophagus putrescentiae]

24 hours after the treatment of Tyrophagus putrescentiae according to the same procedure as Example 1, the number of living mites was counted. Mortality (%) was calculated by means of Abott revision method as in Example 1. The results are shown on Table 2.

TABLE 2__________________________________________________________________________ Mortarity (%) Amount of active Amount of activeExperiment Name of test samples ingredient ingredientNo. (mixed ratio by weight) (0.5 g/m.sup.2) (0.1 g/m.sup.2)__________________________________________________________________________50 NFC 100 9851 NBA 100 4252 PCMX 100 3053 BCA 96 2654 NFC/NBA(1/1) 100 6655 NFC/PCMX(1/1) 100 6356 NFC/BCA(1/1) 100 6357 NFC/NBA/PCMX(1/1/1) 100 5458 NFC/NBA/BCA(1/1/1) 100 5559 NBA/PCMX/BCA(1/1/1) 100 3960 NFC/NBA/PCMX/BCA(1/1/1/1) 100 3461 PS 100 4862 PB 100 5563 DA 100 5264 MNK 100 4365 CM 100 4566 PS/DB(1/1) 100 5467 PS/DA(1/1) 100 5468 DA/MNK(1/1) 100 4769 MNK/CM(1/1) 100 4070 PS/PB/DA(1/1/1) 100 5271 PS/PB/MNK(1/1/1) 100 4972 PS/DA/MNK(1/1/1) 100 4673 PS/MNK/CM(1/1/1) 100 4574 PS/PB/DA/MNK(1/1/1/1) 100 5375 PS/PB/DA/CM(1/1/1/1) 100 5176 PS/PB/DA/MNK/CM(1/1/1/1/1) 100 5177 PB' 100 4078 CBP 100 1379 TFS 42 1080 BIC 95 9481 OPP/SPP(1/1) 100 10082 CIO/MIO(1/1) 100 4483 CBP/TFS(1/1) 100 1084 CBP/BIC(1/1) 100 6685 CBP/SPP(1/1) 100 8586 CBP/CIP/MIO(1/1/1) 100 1887 CBP/TFS/BIC(1/1/1) 100 2788 TFS/OPP/SPP(1/1/1) 100 7989 TFS/CIO/MIO(1/1/1) 98 2390 BIC/OPP/SPP(1/1/1) 100 10091 BIC/CIO/MIO(1/1/1) 100 7292 CBP/TFS/OPP/SPP(1/1/1/1) 100 5493 CBP/TFS/CIO/MIO(1/1/1/1) 100 2194 CBP/BIC/OPP/SPP(1/1/1/1) 100 8195 CBP/BIC/CIO/MIO(1/1/1/1) 100 7396 CBP/TFS/BIC/OPP/SPP(1/1/1/1/1) 100 6897 CBP/TFS/BIC/CIO/MIO(1/1/1/1/1) 100 3798 CBP/TFS/BIC/OPP/SPP/CIO/MIO(1/1/1/1/1/1/1) 100 44Reference dl,d-T80-resmethrin 38 5example__________________________________________________________________________

The acaricides of the present invention had an equivalent effect to or a more effect than dl,d-T80-resmethrin on Tyrophagus putressentiae.

EXAMPLE 3

According to the conditions shown on Table 3 following, mite proof materials in the form of carpets were made aiming to make carpets mite-proof.

TABLE 3__________________________________________________________________________Pile Base cloth Backing agent Lining clothExperi- Kneaded amount Kneaded amount Mixed amount Kneaded amountment of test samples of test samples of test samples of test sampleNo. Material (g/m.sup.2) Material (g/m.sup.2) Material (g/m.sup.2) Material (g/m.sup.2)__________________________________________________________________________ 99 Polypro- -- Polypro- -- SBR group CBP(30) Jute -- pylene pylene100 Polypro- -- Polypro- -- SBR group TFS(40) Jute OPP(1) pylene pylene SPP(1) (Surface spray)101 Polypro- -- Polypro- BIC(15) SBR group CBP(10) Jute -- pylene pylene102 Polypro- BIC(10) Polypro- -- EVA group OPP(1) Polypro- -- pylene pylene SPP(5) pylene Rayon103 Polypro- TFS(15) Polypro- -- EVA group TFS(10) Polypro- -- pylene pylene pre-coat pylene Rayon104 Polypro- TFS(15) Polypro- -- EVC group CIO(5) Polypro- -- pylene pylene MIO(5) pylene Rayon105 Acryl CBP(3) Polypro- -- SBR group CBP(10) Polypro- -- (Surface pylene pylene spray) Rayon106 Acryl -- Polypro- -- EVA group OPP(20) Polypro- -- pylene SPP(20) pylene Rayon107 Nylon CIO(5) Rayon -- SBR group MIO(10) Polypro- -- NIO(4) CIO(10) pylene Rayon108 Nylon -- Rayon -- SBR group TFS(15) Polypro- BIO(5) pylene (Surface Rayon spray)109 Nylon -- Rayon TFS(10) SBR group CBP(20) Polypro- -- pylene Rayon110 Nylon -- Rayon -- EVA group TFS(20) Polypro- -- pre-coat Benzyl- pylene benzoate Rayon111 Polyester TFS(5) Polypro- -- SBR group BIC(30) Polypro- -- pylene pylene Rayon112 Polyester CBP(3) Polypro- -- SBR group OPP(10) Polypro- -- (Surface pylene SPP(10) pylene spray) Rayon113 Polypro- -- Polypro- -- SBR group PS(50) Jute -- pylene pylene114 Polypro- -- Polypro- MNK(10) SBR group PB(50) Jute -- pylene pylene115 Polypro- -- Polypro- -- SBR group PS(50) Jute DA(5) pylene pylene (Surface spray)116 Polypro- PS(10) Polypro- -- EVA group DA(40) Polypro- -- pylene pylene pylene Rayon117 Polypro- PB(5) Polypro- -- EVC group MNK(40) Polypro- -- pylene pylene CM(5) pylene Rayon118 Acryl PB(5) Polypro- -- SBR group PS(30) Polypro- CM(5) pylene pylene (Surface Rayon spray)119 Nylon -- Rayon -- SBR group PS(20) Polypro- -- Benzyl- pylene benzoate Rayon120 Nylon -- Rayon PS(10) EVA group PB(40) Polypro- PS(1) pylene Diethyl- Rayon tolu- amide(3) (Surface spray)121 Nylon PS(2) Rayon -- EVC group PS(50) Polypro- -- Diethyl- pylene tolu- Rayon amide(5) (Surface spray)122 Polyester -- Polypro- PS(5) SBr group PS(50) Polypro- -- pylene pylene Rayon123 Polypro- -- Polypro- -- SBR group NBA(40) Jute -- pylene pylene124 Polypro- -- Polypro- -- SBR group PCMX(30) Jute NFC(2) pylene pylene (Surface spray)125 Polypro- NFC(5) Polypro- -- EVA group BCA(30) Polypro- -- pylene pylene pylene Rayon126 Acryl -- Polypro- NFC(5) EVA group BCA(30) Polypro- -- pylene pre-coat pylene Rayon127 Nylon NFC(5) Rayon -- SBR group NFC(3) Polypro- -- Benzyl- pylene benzoate Rayon (30)128 Nylon NFC(1) Rayon -- SBR group NBA(30) Polypro- -- Benzyl- pylene benzoate Rayon (Surface spray)129 Polyester NBA(5) Polypro- NFC(5) EVC group POMX(20) Polypro- NFC(2) (Surface pylene pylene (surface spray) Rayon spray)130 Polypro- -- Polypro- PB(5) SBR group PB'(40) Jute -- pylene pylene131 Polypro- PB'(10) Polypro- -- EVA group PB'(30) Jute -- pylene pylene132 Polypro- -- Polypro- -- EVC group PB'(50) Jute -- pylene pylene133 Acryl PB'(2) Polypro- -- EVC group PB'(25) Jute -- (Surface pylene DEET(10) spray)134 Nylon PB'(3) Rayon -- EVC group PB'(20) Polypro- -- pre-coat pylene Rayon135 Nylon -- Rayon -- SBR group PB'(40) Polypro- -- pylene Rayon136 Polyester AA(3) Polypro- -- SBR group PB'(25) Polypro- PB'(5) (Surface pylene pylene (Surface spray) Rayon spray)__________________________________________________________________________

The following test was carried out with respect to each of the mite proof carpets made according to the above-mentioned conditions.

(Testing method)

A medium containing about ten thousand of mites of Dermatophagoides farinae was set in the center of both the each of tested carpets and an untreated carpet (20.times.20 cm each) and put each of them at the bottom of a container (41.times.31.times.22 cm). After allowing it to stand for two days under the condition of 25.degree. C. and 64% RH, the mites on the right side or the other side of each carpet were sucked by a vacuum cleaner with putting two sheets of 200 mesh of nylon gauze at the conector of the suction tube. After removing the nyron gauze from the vacuum cleaner the mites were brushed into a 300 ml beaker which contains 100 ml of Darling's solution. After stirring, the solution was poured into a centrifugal tube and centrifuged at the rate of 1000 rpm. The supernatant was poured into a Buchnr funnel with a filter on it and filtered by means of suction filtration. The number of living mites on the filter was counted and the result of mortarity was calculated according to the following formula. ##EQU2## X: percentage of living mites in untreated carpet group Y: percentage of living mites in acaricide treated carpet group

The above test was repeated three times and the average of mortalities was calculated. As a result, the mortality was 100% in all cases.

EXAMPLE 4

A trace quantity of perfume and 20 ml of ethyl cellosolve were added to each of 15 g of test samples shown on Table 4. Further, odorless kerosene was added to it so as to make the total volume 150 ml. Then, a pressure can for aerosol (capacity: 400 ml) was filled with both the above solution and 150 ml of the mixture of the liquefied petroleum gas and dimethyl ether (ratio by volume 1:1), put onto a jet equipment and sealed up. The acaricides in the form of aerosol of the present invention were obtained.

By using each aerosol obtained in the above, the effect of prevention of mites was tested by the same procedure as in Example 1.

(Testing method)

Each aerosol was sprayed for 3 seconds onto a fine paper (30.times.30 cm) as equal as possible. After allowing it to stand for one day under ordinary temprature, it was cut into 5.times.5 cm sheets and then the effect of prevention of mites was tested by the same procedure as in Example 1.

The above test was repeated three times. The results are shown on Table 4 according to the average of the mortalities.

TABLE 4______________________________________Experiment Names of test samples MortalityNo. (mixed ratio by weight) (%)______________________________________137 NFC 100138 NBA 100139 NFC/NBA(1/1) 100140 NFC/PCMX(1/1) 100141 NFC/BCA(1/1) 100142 NBA/PCMX(1/1) 100143 NBA/BCA(1/1) 100144 PS 100155 PB 100156 DA 100157 PS/PB(1/1) 100158 PS/DA(1/1) 100159 MNK/CM(2/1) 100160 PS/dl,d-T80-resmethrin(4/1) 100161 PS/benzylbenzoate(1/1) 100162 BS 100163 PB 100164 PB/BS(1/1) 100165 PB/AC(1/1) 100166 BS/AB(4/1) 100167 CBP 100168 TFS 100169 BIC 100170 OPP/SPP(1/1) 100171 CIO/MIO(1/1) 100172 CBP/TFS(1/1) 100173 CBP/BIC(1/1) 100174 CBP/dl,d-T80-resmethrin(2/1) 100______________________________________

As shown on Table 4, each aerosol has an enough effect on prevention of mites.

EXAMPLE 5

A each test sample on Table 5 was mixed with each solvent shown on the same Table, a non-woven fablic (made of polyethyene-pulp of 300 .mu.m thick and 1 m.sup.2 area) was impregnated with the above solvent so as to contain 1 g of each of test samples in amount and dried, and thus the mite proof materials in the form of sheet of the present invention were obtained.

This sheet was cut into 5.times.5 cm sheets and then effect of prevention of mites was tested by the same procedure as in Example 1.

TABLE 5______________________________________Experiment Test samples Names of solventNo. (concentration %) (mixed ratio by weight)______________________________________175 NFC (2) n-Hexane176 NBA (3) n-Hexane177 PCMX (3) Solventnaphtha178 BCA (3) Solventnaphtha179 NFC (1) Solventnaphtha PCMX (2)180 PCMX (6) Polyvinylchloride ink (14) Toluene (80)181 PS (3) n-Hexane182 PB (3) n-Hexane183 DA (3) n-Hexane184 PS (2) n-Hexane PB (1)185 PS (2) n-Hexane DA (1)186 PS (3) Polyvinylchloride ink (14) MNK (3) Toluene (80)187 MNK (2) Solventnaphtha CM (1)188 CBP (3) n-Hexane189 TFS (3) n-Hexane190 OPP (1) n-Hexane SPP (1)191 CIO (1) n-Hexane MIO (1)192 BIC (1) Dimethylsulfoxide193 CBP (1) Polyvinylchloride ink (19) Toluene (80)194 CBP (1) Solventnaphtha TFS (1)195 OPP (5) Water SPP (5)196 CIO (1) water MIO (1)197 BS (3) n-Hexane198 PB (3) n-Hexane199 BS (6) Polyvinylchloride ink (14) Toluene (80)200 BS (2) Solventnaphtha PB (1)______________________________________

As a result, all samples showed almost 100% of mortality and thus enough effects of prevention of mites.

EXAMPLE 6

Each of the test samples employed in Example 5 was stirred and mixed well with the same weight of oxidized silicon and powdered. Then the acaricides of the present invention in the form of powder were obtained. The effect of prevention of mites of the above powder was tested by the following method.

(Testing Method)

After 2 cm-cut-straws were heated to exterminate insect, 5 g of them was put into a 100 ml trigonal flask, and then 0.05 g of each powder was put in it. Then it was mixed well and allowed to stand for one day under the condition of 25.degree. C. and from 85 to 90% RH. Afterward, about four hundred of mites of Tyrophagus putrescentiae were put into this flask and then it was allowed to stand for two more days under the same condition as above and living mites were removed by means of heat-flushing out method.

The number of living mites was counted and mortality was calculated according to the formula in Example 3.

As a result, each powder showed almost 100% of mortality and thus enough effect of prevention of mites.

Claims

1. A method for killing mites on a material which comprises applying to said mites a composition containing a miticidal amount of phenyl salicylate or of benzyl salicylate.

2. A method according to claim 1, wherein the material is in a house.

3. A method according to claim 2, wherein the material is a tatami mat or a carpet.

4. A method according to claim 2, wherein the material is bedding or furniture.