WO2008123573A2

WO2008123573A2 - Pesticidal aerosol composition

Info

Publication number: WO2008123573A2
Application number: PCT/JP2008/056640
Authority: WO
Inventors: Yoshito Tanaka; Masahiro Yamada
Original assignee: Sumitomo Chemical Company, Limited
Priority date: 2007-03-30
Filing date: 2008-03-27
Publication date: 2008-10-16
Also published as: JP2008273944A; TW200845907A; WO2008123573A3; AR065870A1

Abstract

A pesticidal aerosol composition containing 4-methoxymethyl-2,3,5,6-tetrafluorobenzyl 3-(2-cyano-1-propenyl)-2,2-dimethylcyclopropanecarboxylate, an organic solvent and a propellant, wherein the organic solvent is a saturated hydrocarbon solvent, has an excellent pesticidal activity.

Description

DESCRIPTION PESTICIDAL AEROSOL COMPOSITION

BACKGROUND OF THE INVENTION Field of the Invention

The present invention relates to a pesticidal aerosol composition. Description of the Related Art

A pesticidal aerosol composition containing 4-methoxymethyl-2, 3, 5, 6-tetrafluorobenzyl 3- (2-cyano-l- propenyl) -2, 2-dimethylcyclopropanecarboxylate, dichloromethane, deodorized kerosene and a propellant is known to have a pesticidal activity (see, for example, U.S. Patent No. 6908945).

SUMMARY OF THE INVENTION

An object of the present invention is to provide an aerosol composition having an excellent pesticidal activity.

After intensive studies to find an aerosol composition having an excellent pesticidal activity, the inventors have found that a pesticidal aerosol composition containing 4-methoxymethyl-2, 3, 5, 6- tetrafluorobenzyl 3- (2-cyano-l-propenyl) -2,2- dimethylcyclopropanecarboxylate, an organic solvent and a propellant, wherein the organic solvent is a saturated hydrocarbon solvent, has an excellent pesticidal activity, and thus, they have made the present invention.

The present invention provides:

1. A pesticidal aerosol composition, comprising 4-methoxymethyl-2, 3, 5, 6-tetrafluorobenzyl 3- (2-cyano-l- propenyl) -2, 2-dimethylcyclopropanecarboxylate, an organic solvent and a propellant, wherein the organic solvent is a saturated hydrocarbon solvent;

2. The pesticidal aerosol composition described in 1, wherein the composition comprises 4- methoxymethyl-2, 3, 5, 6-tetrafluorobenzyl 3- (2-cyano-l- propenyl) -2, 2-dimethylcyclopropanecarboxylate in an amount of 0.000001 to 0.1 part by weight per part by weight of the saturated hydrocarbon solvent; 3. The pesticidal aerosol composition described in 2, wherein the composition comprises the propellant in an amount of 0.25 to 8 parts by weight per part by weight of the saturated hydrocarbon solvent;

4. The pesticidal aerosol composition described in any one of 1 to 3, wherein the composition comprises f 4-methoxymethyl-2, 3, 5, 6-tetrafluorobenzyl 3-(2-cyano- 1-propenyl) -2, 2-dimethylcyclopropanecarboxylate in an amount of 0.001 to 1 weight percent, the saturated hydrocarbon solvent in an amount of 10 to 79 weight percent, and the propellant in an amount of 20 to 80 weight percent;

5. The pesticidal aerosol composition described in any one of 1 to 4, wherein the saturated hydrocarbon solvent is a saturated hydrocarbon solvent having an initial boiling point of 150⁰C or higher and a 95%- distillation temperature of 300⁰C or lower;

6. The pesticidal aerosol composition described in any one of 1 to 5, wherein the composition is for controlling insects Blattaria;

7. The pesticidal aerosol composition described in any one of 1 to 5, wherein the composition is for controlling insects Hymenoptera; 8. The pesticidal aerosol composition described in any one of 1 to 5, wherein the composition is for controlling insects Vespidae;

9. A method for controlling harmful insects, comprising spraying on the harmful insects or a locus where the insects in habit an effective amount of a pesticidal aerosol composition comprising 4- methoxymethyl-2, 3, 5, 6-tetrafluorobenzyl 3- (2-cyano-l- propenyl) -2, 2-dimethylcyclopropanecarboxylate, an organic solvent and a propellant, wherein the organic solvent is a saturated hydrocarbon solvent;

10. The method described in 9, wherein the composition comprises 4-methoxymethyl-2, 3, 5, 6- tetrafluorobenzyl 3- (2-cyano-l-propenyl) -2,2- dimethylcyclopropanecarboxylate in an amount of 0.000001 to 0.1 part by weight per part by weight of the saturated hydrocarbon solvent;

11. The method described in 10, wherein the composition comprises the propellant in an amount of 0.25 to 8 parts by weight per part by weight of the saturated hydrocarbon solvent;

12. The method described in 9, wherein the composition comprises 4-methoxymethyl-2, 3, 5, 6- tetrafluorobenzyl 3- (2-cyano-l-propenyl) -2, 2- dimethylcyclopropanecarboxylate in an amount of 0.001 to 1 weight percent, the saturated hydrocarbon solvent in an amount of 10 to 79 weight percent, and the propellant in an amount of 20 to 80 weight percent; 13. The method described in any one of 9 to 12, wherein the saturated hydrocarbon solvent has an initial boiling point of 150⁰C or higher and a 95%- distillation temperature of 300⁰C or lower;

14. The method described in any one of 9 to 13, wherein the method is for controlling insects

Blattaria;

15. The method described in any one of 9 to 13, wherein the method is for controlling insects Hymenoptera; 16. The method described in any one of 9 to 13, wherein the method is for controlling insects Vespidae; and

17. A pesticidal aerosol, comprising the pesticidal aerosol composition described in any one of 1 to 8.

The pesticidal aerosol composition according to the present invention has an excellent pesticidal activity. DETAILED DESCRIPTION OF THE INVENTION

The pesticidal aerosol composition according to the present invention is a pesticidal aerosol composition comprising 4-methoxymethyl-2, 3, 5, 6- tetrafluorobenzyl 3- (2-cyano-l-propenyl) -2, 2- dimethylcyclopropanecarboxylate (hereinafter, sometimes referred to as compound A) , an organic solvent and a propellant, wherein the organic solvent is a saturated hydrocarbon solvent.

The compound A is a compound described, for example, in U.S. Patent No. 6908945 and can be prepared according to the method described therein.

Although the compound A has isomers, based on the two asymmetric carbon atoms and a double bond in the cyclopropane ring, any isomer or a mixture of the isomers at any ratio may be used in the present invention.

The content of the compound A in the pesticidal aerosol composition according to the present invention usually ranges from 0.001 to 50 weight percent, preferably from 0.01 to 1 weight percent.

The pesticidal aerosol composition according to the present invention contains a saturated hydrocarbon solvent as the organic solvent. The saturated hydrocarbon solvent used is usually, for example, a solvent having an initial boiling point of 150⁰C or higher and a 95%-distillation temperature of 300⁰C or lower, but alternatively, a solvent having an initial boiling point of 150⁰C or higher and a dry point of 300⁰C or lower may of course be used. Examples of the saturated hydrocarbon solvents include Isopar G (manufactured by Exxon Mobil Corp., initial boiling point: 160⁰C, dry point: 176°C), Isopar L (manufactured by Exxon Mobil Corp., initial boiling point: 189⁰C, dry point: 207⁰C), Isopar H (manufactured by Exxon Mobil Corp., initial boiling point: 178°C, dry point: 188⁰C), Isopar M (manufactured by Exxon Mobil

Corp., initial boiling point: 223°C, dry point: 254°C), Norpar 13 (manufactured by Exxon Mobil Corp., initial boiling point: 222°C, dry point: 242°C), Norpar 15 (manufactured by Exxon Mobil Corp., initial boiling point: 249°C, dry point: 274°C), Exxsol D40

(manufactured by Exxon Mobil Corp., initial boiling point: 164°C, dry point: 192°C) , Exxsol D60 (manufactured by Exxon Mobil Corp., initial boiling point: 187°C, dry point: 209⁰C), Exxsol D80 (manufactured by Exxon Mobil Corp., initial boiling point: 208°C, dry point: 243°C) , Neochiozol (manufactured by Chuokasei Co., Ltd., initial boiling point: 225°C, dry point: 247°C), IP Solvent 2028 (manufactured by Idemitsu Kosan Co., Ltd., initial boiling point: 213°C, 95%-distillation temperature: 250⁰C), and kerosene.

The content of the saturated hydrocarbon solvent in the pesticidal aerosol composition according to the present invention usually ranges from 10 to 79 weight percent, preferably from 20 to 70 weight percent.

The propellant contained in the pesticidal aerosol composition according to the present invention is a liquefied gas having a boiling point of from -50⁰C to 0⁰C, and examples of the propellants include liquefied petroleum gas (LPG) , dimethylether, propane, n-butane and isobutane. The content of the propellant in the pesticidal aerosol composition according to the present invention usually ranges from 20 to 80 weight percent, preferably from 25 to 75 weight percent.

The pesticidal aerosol composition according to the present invention contains the ester compound and the saturated hydrocarbon solvent in a ratio usually falling within the range of from 0.000001 to 0.1 part by weight, preferably from 0.000005 to 0.05 part by weight of the ester compound per part by weight of the saturated hydrocarbon solvent. The composition contains the saturated hydrocarbon solvent and the propellant in a ratio usually falling within the range of from 0.25 to 8 parts by weight, preferably from 0.3 to 4 parts by weight of the propellant per part by weight of the saturated hydrocarbon solvent. More specifically, the pesticidal aerosol composition according to the present invention usually contains the ester compound in a ratio of 0.000001 to 0.1 part by weight and the propellant in a ratio of 0.25 to 8 part by weight per part by weight of the saturated hydrocarbon solvent, and preferably contains the ester compound in a ratio of 0.000005 to 0.05 part by weight and the propellant in a ratio of 0.3 to 4 parts by weight per part by weight of the saturated hydrocarbon solvent.

The pesticidal aerosol composition according to the present invention may contain, as needed, one or more of additional additives such as other pesticidal components, repellents, synergists, and flavoring agents.

Examples of the other pesticidal components include organophosphates such as dichlorvos, fenitrothion, tetrachlorvinphos, fenthion, chlorpyrifos, and diazinon; carbamate compounds such as propoxur, carbaryl, metoxadiazone, and fenobucarb; chitin synthesis inhibitors such as lufenuron, chlorfluazuron, hexaflumuron, diflubenzuron, cyromazine, and 1- (2, 6-difluorobenzoyl) -3- [2-fluoro-4- (1, 1,2, 3, 3, 3-hexafluoropropoxy) phenyl] urea; juvenile hormone analogs such as pyriproxyfen, methoprene, hydroprene, and fenoxycarb; neonicotinoids; and N- phenylpyrazoles .

The repellents include, for example, N, N- diethyl-m-toluamide, limonene, linalool, citronellal, menthol, menthone, hinokitiol, geraniol, eucalyptol, indoxacarb, carane-3, 4-diol, MGK-R-326, MGK-R-874, and BAY-KBR-3023. Examples of the synergists include 5-[2-(2- butoxyethoxy) ethoxymethyl] -6-propyl-l, 3-benzodioxol, N- (2-ethylhexyl) -bicyclo [2.2.1] hept-5-ene-2, 3- dicarboxyimide, octachlorodipropylether, isobornyl thiocyanoacetate, and N- (2-ethylhexyl) -l-isopropyl-4- methylbicyclo [2.2.2] oct-5-ene-2, 3-dicarboxyimide .

Examples of the stabilizers include phenolic antioxidants such as 2, 6-di-t-butyl-4-methylphenol.

A pesticidal aerosol containing the pesticidal aerosol composition according to the present invention can be prepared, for example, by filling an aerosol container with the pesticidal aerosol composition according to the invention containing the compound A and an organic solvent and as needed other additives such as pesticidal component, repellent, synergist, and stabilizer, attaching an aerosol valve to the container, filling the container with a propellant through the stem, shaking the container, and then attaching an actuator additionally. Examples of the actuators include push-button and trigger actuators.

The pesticidal aerosol composition according to the present invention is used, for example, by spraying a pesticidal aerosol containing an effective amount of the pesticidal aerosol composition according to the invention on harmful insects and the migration route and/or the habitat thereof. The spraying amount then, usually ranges approximately from 0.001 to 1,000 mg per m² in terms of compound A, when applied on an area; and usually ranges from approximately 0.001 to 1,000 mg per m³ in terms of compound A when applied in a space. Examples of the harmful insects that can be controlled with the pesticidal aerosol composition . according to the invention include arthropods such as insects and mites, and typical examples include the followings: Lepidoptera: Pyralidae such as Chilo suppressalis, Cnaphalocrocis medinalis, and Plodia interpunctella; Noctuidae such as Spodoptera litura, Pseudaletia separata, and Mamestra brassicae; Pieridae such as Pieris rapae crucivora; Tortricidae such as Adoxophyes orana; Carposinidae; Lyonetiidae;

Lymantriidae; Antographa; Agrotis spp. such as Agrotis segetum and Agrotis ipsilon; Helicoverpa spp.; Heliothis spp.; Plutella xylostella; Parnara guttata guttata; Tinea pellionella; Tineola bisselliella, etc. Diptera: Culex such as Culex pipiens pallens,

Culex tritaeniorhynchus and Culex quinquefasciatus; Aedes such as Aedes aegypti and Aedes albopictus; Anophelinae such as Anopheles sinensis and Anopheles gambiae; Chironomidae; Muscidae such as Musca domestica, Muscina stabulans, and Fannia canicularis; Calliphoridae; Sarcophagidae; Anthomyiidae such as Delia platura and Delia antiqua; Tephritidae; Drosophilidae; Psychodidae; Phoridae; Tabanidae; Simuliidae; Culicoides; Ceratopogonidae, etc.

Blattaria: Blattella germanica, Periplaneta fuliginosa, Periplaneta americana, Periplaneta australasiae, Periplaneta brunnea, Lobopterella dimidiatipes, etc.

Hyraenoptera: Formicidae, Vespidae such as Vespa crabro and Vespa analis, Bethylidae, Tenthredinidae such as Athalia rosae ruficornis, etc.

Siphonaptera: Ctenocephalides canis, Ctenocephalides felis felis, Pulex irritans, etc.

Anoplura: Pediculus humanus, Pthirus pubis, Pediculus capitis, Pediculus humanus, etc.

Isoptera (termites) : Reticulitermes speratus speratus, Coptotermes formosanus, etc. Hemiptera: Delphacidae such as Laodelphax stratella, Nilaparvata lugens, and Sogatella furcifera; Deltocephalidae such as Nephotettix cincticeps and Nephotettix virescens; Aphididae; Pentatomidae; Aleyrodidae; Coccoidae; Tingidae; Psyllidae; Cimicidae; etc.

Coleoptera: Attagenus japonicus, Anthrenus verbasci; corn rootworms such as Western corn rootworm and Southern corn rootworm; Scarabaeidae such as Anomala cuprea and Anomala rufocuprea; Curculionidae such as Sitophilus zeamais, Lissorhoptrus oryzophilus, Anthonomus grandis grandis, and Callosobruchus chinensis; Tenebrionidae such as Tenebrio molitor and Tribolium castaneum; Chrysomelidae such as Oulema oryzae, Phyllotreta striolata, and Aulacophora femoralis; Anobiidae, Epilachna spp. such as Epilachna vigintioctopunctata; Lyctidae; Bostrychidae; Cerambycidae; Paederus fuscipes; etc. Thysanoptera (thrips) : Thrips palmi,

Frankliniella occidentalis, Thrips hawaiiensis, etc. Orthoptera: Gryllotalpidae, Acrididae, etc. Acarines: Pyroglyphidae such as Dermatophagoides farinae and Dermatophagoides pteronyssinus; Acaridae such as Tyrophagus putrescentiae and Aleuroglyphus ovatus; Glycyphagidae such as Glycyphagidae privatus, Glycyphagidae domesticus, and Glycyphagus destructor; Cheyletidae such as Cheyletus malaccensis and Cheyletus fortis; Tarsonemidae; Chortoglyphidae; Haplochthoniidae;

Tetranychidae such as Tetranychus urticae, Tetranychus Kanzawai, Panonychus citri, and Panonychus ulmi; Ixodidae such as Haemaphysalis longicornis; etc.

EXAMPLES

Hereinafter, the present invention will be described in more detail with reference to Formulation Examples and Examples, but it should not be understood that the present invention is restricted thereby. First, Formulation Examples for the aerosols containing the pesticidal aerosol composition according to the present invention will be described. "Part" in the following Examples means "part by weight". Formulation Example 1

0.04 Part of 4-methoxymethyl-2, 3, 5, 6- tetrafluorobenzyl lR-trans-3- (2-cyano-l- propenyl (E/Z=l/5) ) -2,2-dimethylcyclopropanecarboxylate and 39.96 parts of Isopar M were placed in an aerosol can. Then, a valve was attached to the can, and 60 parts of a propellant (liquefied petroleum gas) was charged through the valve into the can, to give an aerosol containing 100 parts of the pesticidal aerosol composition (hereinafter, referred to as inventive aerosol (1) ) . Formulation Example 2

0.04 Part of 4-methoxymethyl-2, 3, 5, 6- tetrafluorobenzyl lR-trans-3- (2-cyano-l- propenyl (E/Z=l/5) ) -2, 2-dimethylcyclopropanecarboxylate and 49.96 parts of Isopar M were placed in an aerosol can. Then, a valve was attached to the can, and 50 parts of a propellant (liquefied petroleum gas) was charged through the valve into the can, to give an aerosol containing 100 parts of the pesticidal aerosol composition (hereinafter, referred to as inventive aerosol (2) ) . Formulation Example 3

0.2 Part of 4-methoxymethyl-2, 3, 5, 6- tetrafluorobenzyl lR-trans-3- (2-cyano-l- propenyl (E/Z=l/5) ) -2,2-dimethylcyclopropanecarboxylate and 49.8 parts of Neochiozol were placed in an aerosol can. Then, a valve was attached to the can, and 50 parts of a propellant (1:1 mixture of dimethyl ether and liquefied petroleum gas) was charged through the valve into the can, to give an aerosol containing 100 parts of the pesticidal aerosol composition (hereinafter, referred to as inventive aerosol (3) ) . Formulation Example 4

0.02 Part of 4-methoxymethyl-2, 3, 5, 6- tetrafluorobenzyl lR-trans-3- (2-cyano-l- propenyl (E/Z=l/5) ) -2, 2-dimethylcyclopropanecarboxylate and 59.98 parts of Isopar M were placed in an aerosol can. Then, a valve was attached to the can, and 40 parts of a propellant (liquefied petroleum gas) was charged through the valve into the can, to give an aerosol containing 100 parts of the pesticidal aerosol composition (hereinafter, referred to as inventive aerosol (4) ) . Formulation Example 5

0.08 Part of 4-methoxymethyl-2, 3, 5, 6- tetrafluorobenzyl lR-trans-3- (2-cyano-l- propenyl (E/Z=l/5) ) -2, 2-dimethylcyclopropanecarboxylate and 49.92 parts of Neochiozol were placed in an aerosol can. Then, a valve was attached to the can, and 50 parts of a propellant (liquefied petroleum gas) was charged through the valve into the can, to give an aerosol containing 100 parts of the pesticidal aerosol composition (hereinafter, referred to as inventive aerosol (5) ) . Reference Preparative Example 1 0.04 Part of 4-methoxymethyl-2, 3, 5, 6- tetrafluorobenzyl lR-trans-3- (2-cyano-l- propenyl (E/Z=l/5) ) -2, 2-dimethylcyclopropanecarboxylate, 5 parts of dichloromethane, and 34.96 parts of Isopar M were placed in an aerosol can. Then, a valve was attached to the can, and 60 parts of a propellant (liquefied petroleum gas) was charged through the valve into the can, to give an aerosol containing 100 parts of the pesticidal aerosol composition (hereinafter, referred to as comparative aerosol (1) ) . Reference Preparative Example 2

0.04 Part of 4-methoxymethyl-2, 3, 5, 6- tetrafluorobenzyl lR-trans-3- (2-cyano-l- propenyl (E/Z=l/5) ) -2, 2-dimethylcyclopropanecarboxylate, 6.41 parts of dichloromethane and, 43.55 parts of

Isopar M were placed in an aerosol can. Then, a valve was attached to the can, and 50 parts of a propellant (liquefied petroleum gas) was charged through the valve unit into the can, to give an aerosol containing 100 parts of aerosol composition (hereinafter, comparative aerosol (2) ) .

Hereinafter, the pesticidal effects of the aerosols containing the pesticidal aerosol composition according to the present invention will be described. Test Examples 1 and 2

Ten adult Musca domesticas (five males and females) were placed in a polyethylene cup (bottom diameter: 10.6 cm, top diameter: 12 cm, height: 7 cm), and the cup was covered with a 16-mesh nylon gauze. Separately, a cup containing no Musca domestica was provided. The cup containing Musca domesticas was placed at the center of the bottom floor of a 70-cm cubic chamber and the cup without Musca domestica at the innermost part of the bottom floor.

The inventive aerosol (1) was sprayed into the chamber through a window formed in the center of the front side wall of the chamber, in an amount of 300 mg in terms of an aerosol composition. Then, the number of the insects knocked down was monitored over a period of 5 minutes. The period needed for knocking down 90 percent of the test insects (KTgo) was calculated from the results obtained (each in duplicate) .

Test Example 2

A test was performed in the same manner as in Example 1, except that the inventive aerosol (1) was replaced with the inventive aerosol (2) . Reference Test Examples 1 and 2

A test was performed in the same manner as in Example 1, except that the inventive aerosol (1) was replaced with the comparative aerosol (1) or (2) .

The results obtained in Test Examples 1 and 2 and Reference Test Examples 1 and 2 are summarized in Table 1. [Table 1]

Test Example 3

Three female hornets (Vespa crabro) were placed in a cubic stainless cage (25 cm X 25 cm X 25 cm, 16-mesh metallic wire netting) . The cage was hung from the ceiling of a test chamber (1.8 m X 1.8 m X 1.8 m) with a metallic chain so that it was placed in the air at a height of 120 cm from the floor of the chamber. 4 Grams of the inventive aerosol (3) was sprayed onto the cage from a point 100 cm distant from the side of the cage. After 3 minutes from the spraying, the insects were transferred from the cage into a clean polyethylene cup (bottom diameter: 10.6 cm, top diameter: 12 cm, height: 7 cm). They were fed by honey diluted by water, and the cup was allowed to stand still at room temperature for a day. One day after the spraying, dead and alive insects were counted to determine the mortality (average of duplicate) . As a result, the mortality was 100%. Test Example 4

Five female hornets (Vespa analis) were placed in a cubic stainless cage (25 cm X 25 cm X 25 cm, 16-mesh metallic wire netting) . The cage was hung from the ceiling of a test chamber (1.8 m X 1.8 m X 1.8 m) with a metallic chain so that it was placed in the air at a height of 120 cm from the floor of the chamber. 4 Grams of the inventive aerosol (3) was sprayed onto the cage from a point 100 cm distant from the side of the cage. After 3 minutes from the spraying, the insects were transferred from the cage into a clean polyethylene cup (bottom diameter: 10.6 cm, top diameter: 12 cm, height: 7 cm) . They were fed by honey diluted by water, and the cup was allowed to stand still at room temperature for a day. One day after the spraying, dead and alive insects were counted to determine the mortality (average of duplicate) . As a result, the mortality was 100%. Test Example 5

A filter paper having a diameter of 8.2 cm was laid in the inner bottom of a clean polyethylene cup (bottom diameter: 8.2 cm). In order to avoid the escape of insects, talc was coated on the upper part of the inner surface of the cup and air-dried. Thereafter, ten ants (Pristomyrmex pungens) were released in the cup. The cup was placed at the inner bottom of a cylindrical chamber having an inner diameter of 16.5 cm and a height of 60 cm. 500

Milligrams of the inventive aerosol (3) was sprayed onto the cup from the top opening of the chamber. Thereafter, the knocked-down insects were counted along a passage of time up to the expiration of 5 minutes. From the results, the time needed for knocking down 90% of the tested insects (KT90) was determined (each in triplicate). As a result, KT₉0 was 1.0 minutes. Test Example 6

Ten cockroaches Blattella germanica (5 males and 5 females) were released in a test container with butter applied on the internal wall (diameter: 8.75 cm, height: 7.5 cm, bottom face: 16 mesh metal gauze). The container was placed at the inner bottom of a cylindrical chamber having an inner diameter of 16.5 cm and a height of 60 cm. 400 Milligrams of the inventive aerosol (4) was sprayed onto the cup from the top opening of the chamber. Thereafter, the knocked-down insects were counted along a passage of time up to the expiration of 5 minutes.

From the results, the time needed for knocking down 90% of the tested insects (KT₉₀) was determined (each in duplicate). As a result, KT₉₀ was 1.7 minutes. Test Example 7

Six cockroaches Periplaneta australasiae (3 males and 3 females) were released in a test container with butter applied on the internal wall (diameter: 12.5 cm, height: 10 cm, bottom face: 43 mesh metal gauze) . The container was placed at the inner bottom of a cylindrical chamber having an inner diameter of 16.5 cm and a height of 60 cm. 1000 Milligrams of the inventive aerosol (5) was sprayed onto the cup from the top opening of the chamber. Thereafter, the knocked- down insects were counted along a passage of time up to the expiration of 20 minutes. From the results, the time needed for knocking down 90% of the tested insects (KT₉₀) was determined (each in triplicate) . As a result, KT₉₀ was 3.8 minutes.

Claims

1. A pesticidal aerosol composition, comprising 4-methoxymethyl-2, 3, 5, 6-tetrafluorobenzyl 3- (2-cyano-l- propenyl) -2, 2-dimethylcyclopropanecarboxylate, an organic solvent and a propellant, wherein the organic solvent is a saturated hydrocarbon solvent.

2. The pesticidal aerosol composition according to Claim 1, wherein the composition comprises 4- methoxymethyl-2, 3,5, 6-tetrafluorobenzyl 3- (2-cyano-l- propenyl) -2, 2-dimethylcyclopropanecarboxylate in an amount of 0.000001 to 0.1 part by weight per part by weight of the saturated hydrocarbon solvent.

3. The pesticidal aerosol composition according to Claim 2, wherein the composition comprises the propellant in an amount of 0.25 to 8 parts by weight per part by weight of the saturated hydrocarbon solvent.

4. The pesticidal aerosol composition according to any one of Claims 1 to 3, wherein the composition comprises 4-methoxymethyl-2, 3, 5, 6-tetrafluorobenzyl 3- (2-cyano-l-propenyl) -2,2- dimethylcyclopropanecarboxylate in an amount of 0.001 to 1 weight percent, the saturated hydrocarbon solvent in an amount of 10 to 79 weight percent, and the propellant in an amount of 20 to 80 weight percent.

5. The pesticidal aerosol composition according to any one of Claims 1 to 4, wherein the saturated hydrocarbon solvent is a saturated hydrocarbon solvent having an initial boiling point of 150⁰C or higher and a 95%-distillation temperature of 300⁰C or lower.

6. The pesticidal aerosol composition according to any one of Claims 1 to 5, wherein the composition is for controlling insects Blattaria.

7. The pesticidal aerosol composition according to any one of Claims 1 to 5, wherein the composition is for controlling insects Hymenoptera.

8. The pesticidal aerosol composition according to any one of Claims 1 to 5, wherein the composition is for controlling insects Vespidae.

9. A method for controlling harmful insects, comprising spraying on the harmful insects or a locus where the insects inhabit an effective amount of a pesticidal aerosol composition comprising 4- methoxymethyl-2, 3, 5, 6-tetrafluorobenzyl 3- (2-cyano-l- propenyl) -2, 2-dimethylcyclopropanecarboxylate, an organic solvent and a propellant, wherein the organic solvent is a saturated hydrocarbon solvent.

10. The method according to Claim 9, wherein the composition comprises 4-methoxymethyl-2, 3, 5, 6- tetrafluorobenzyl 3- (2-cyano-l-propenyl) -2, 2- dimethylcyclopropanecarboxylate in an amount of 0.000001 to 0.1 part by weight per part by weight of the saturated hydrocarbon solvent.

11. The method according to Claim 10, wherein the composition comprises the propellant in an amount of 0.25 to 8 parts by weight per part by weight of the saturated hydrocarbon solvent.

12. The method according to Claim 9, wherein the composition comprises 4-methoxymethyl-2, 3, 5, 6- tetrafluorobenzyl 3- (2-cyano-l-propenyl) -2,2- dimethylcyclopropanecarboxylate in an amount of 0.001 to 1 weight percent, the saturated hydrocarbon solvent in an amount of 10 to 79 weight percent, and the propellant in an amount of 20 to 80 weight percent.

13. The method according to any one of Claims 9 to 12, wherein the saturated hydrocarbon solvent has an initial boiling point of 150⁰C or higher and a 95%- distillation temperature of 300⁰C or lower.

14. The method according to any one of Claims 9 to 13, wherein the method is for controlling insects Blattaria.

15. The method according to any one of Claims 9 to 13, wherein the method is for controlling insects Hymenoptera.

16. The method according to any one of Claims 9 to 13, wherein the method is for controlling insects Vespidae.

17. A pesticidal aerosol, comprising the pesticidal aerosol composition according to any one of Claims 1 to 8.