Abstract: The purpose of the present invention is to provide a mesoionic compound or a salt thereof that exhibits excellent control activity against various pests. Provided is a mesoionic compound represented by formula (1).

Abstract: The invention relates to new organic phosphoric acid esters represented by the general formula ##STR1## wherein X represents O, S or NH,Y represents O or S,R.sup.1 represents a lower alkyl group,R.sup.2 represents a lower alkyl group or a lower alkoxy-lower alkyl group,R.sup.3 represents a fluoro-substituted lower alkyl group,Z represents a lower alkyl group, a lower alkoxy group or a halogen atom, andn represents 0 or 2,which can be used as pesticidally active agents.

Abstract: This invention relates to novel phosphonic acid esters represented by the following general formula (I) ##STR1## wherein R.sup.1 represents a lower alkyl group or an aryl group,R.sup.2 represents a lower alkyl group or a lower alkoxy-lower alkyl group,R.sup.3 represents a fluoro-substituted lower alkyl group,X represents an oxygen or sulfur atom,Y represents an oxygen or sulfur atom or a group of the formula ##STR2## in which R.sup.4 represents a hydrogen atom or a lower alkyl group, Z represents a hydrogen atom, a halogen atom or a lower alkyl group, andn represents 0 or 2,which can be used as insecticidal, miticidal and nematocidal agents.

Abstract: Organophosphate derivatives of the formula ##STR1## in which X is O, S or NH,Y is O or S,R.sup.1 is a lower alkyl group,R.sup.2 is a lower alkyl group or a lower alkoxy-lower alkyl group,R.sup.3 is a fluoro-substituted lower alkyl group, andn is 0 or 2.which possess pesticidal properties. The phenols of the phenyl esters are also new.

Abstract: An organophosphate of the formula ##STR1## wherein R.sup.1 is an alkyl group containing 3 to 4 carbon atoms or an alkoxyethyl group having an alkoxy moiety containing 1 to 4 carbon atoms,R.sup.2 is a hydrogen atom or a methyl group, andR.sup.3 is an alkyl group containing 1 to 4 carbon atoms or a phenyl group which may be substituted by at least one member selected from the group consisting of a halogen atom, a trifluoromethyl group, a nitro group, an alkyl group containing 1 to 4 carbon atoms, and an alkoxy group containing 1 to 4 carbon atoms,which possesses pesticidal, e.g. insecticidal, acaricidal and nematocidal, activity.

Abstract: O-Alkyl-S-alkyl-S-acyloxyethyl-phosphorodithioldates of the formula ##STR1## wherein R is an alkyl group having 1 to 6 carbon atoms,R.sup.1 is an alkyl group having 1 to 6 carbon atoms or an alkoxyethyl group having 1 to 6 carbon atoms in the alkyl part, andR.sup.2 is an alkoxy group having 1 to 6 carbon atoms, an amino group mono- or di-substituted by an alkyl group having 1 to 6 carbon atoms, an unsubstituted anilino group, or an anilino group substituted at the N-position by an alkyl group having 1 to 6 carbon atoms,which possess pesticidal, e.g. insecticidal, acaricidal and nematicidal, properties.

Abstract: O-alkyl-S-alkyl-O-haloalkyl-phosphates of the formula ##STR1## in which R.sup.1 and R.sup.2 each independently is alkyl with 1-4 carbon atoms,X is halogen, andY is halogenoalkyl with 1-4 carbon atoms,which possess arthropodicidal and nematicidal properties.

Abstract: O-Ethyl-S-n-propyl-O-2,2,2-trihaloethylphosphoro (thiono) thiolates of the formula ##STR1## wherein Y is an oxygen atom or a sulfur atom, and X is a halogen atom.

Abstract: O,S-Dialkyl-O-haloalkyl-phosphorothiolates of the formula ##STR1## in which R.sup.1 is alkyl with 1-8 carbon atoms,R.sup.2 is alkyl with 1-8 carbon atoms or alkoxyalkyl with 2-8 carbon atoms,X is hydrogen, halogenoalkyl with 1-8 carbon atoms or alkoxy with 1-8 carbon atoms, andY is halogen, which possess insecticidal, acaricidal and nematocidal properties.

Abstract: O-Alkyl-S-n-propyl-N-sulfonyl-phosphoric acid ester amides of the formula ##STR1## in which R.sup.1 is methyl or ethyl,R.sup.2 is C.sub.1 -C.sub.6 alkyl or alkenyl, C.sub.1 -C.sub.6 alkyl substituted by aryl, phenyl, C.sub.1 -C.sub.6 alkylphenyl, or halophenylR.sup.3 is C.sub.1 -C.sub.6 alkyl, C.sub.1 -C.sub.6 alkyl substituted by halogen, phenyl, C.sub.1 -C.sub.6 alkylphenyl, C.sub.1 -C.sub.6 alkoxyphenyl, or nitrophenyl, andX is oxygen or sulfur.Which possess insecticidal, acaricidal and nematicidal properties.

Abstract: O,S-Dialkyl-N-substituted N-sulfonyl-phosphoramidothiolates of the formula ##STR1## in which R.sup.1 is ethyl, n-butyl or sec.-butyl,R.sup.2 is alkyl with 1-6 carbon atoms, alkenyl with 2-6 carbon atoms, phenyl, or phenyl substituted with up to two substituents selected from the group consisting of halogen and akyl with 1-6 carbon atoms, andR.sup.3 is alkyl or halogen-substituted alkyl with 1-6 carbon atoms, aralkyl, phenyl or phenyl substituted with up to two substituents selected from the group consisting of halogen, alkyl with 1-6 carbon atoms and nitro,Which possess insecticidal, acaricidal and nematicidal properties.

Abstract: O-Alkyl-S-n-propyl-N-sulfonyl-phosphoric acid ester amides of the formula ##STR1## in which R.sup.1 is methyl or ethyl,R.sup.2 is C.sub.1 -C.sub.6 alkyl or alkenyl, C.sub.1 -C.sub.6 alkyl substituted by aryl, phenyl, C.sub.1 -C.sub.6 alkylphenyl, or halophenylR.sup.3 is C.sub.1 -C.sub.6 alkyl, C.sub.1 -C.sub.6 alkyl substituted by halogen, phenyl, C.sub.1 -C.sub.6 alkylphenyl, C.sub.1 -C.sub.6 alkoxyphenyl, halophenyl, or nitrophenyl, andX is oxygen or sulfur,Which possess insecticidal, acaricidal and nematicidal properties.

Abstract: O-Alkyl-N-sulfamyl-phosphoramidothiolates of the formula ##STR1## in which R.sup.1 is alkyl with 1-6 carbon atoms,R.sup.2 is alkyl or alkenyl with up to 6 carbon atoms,R.sup.3 is alkyl with 1-6 carbon atoms or aryl,R.sup.4 is alkyl with 1-6 carbon atoms,R.sup.5 is alkyl with 1-6 carbon atoms or aryl, andX is oxygen or sulfur,Which possess insecticidal, acaricidal, nematicidal and fungicidal properties.

Abstract: Organophosphoric acid ester anhydrides of the formula ##STR1## in which R.sup.1 is alkyl with 1-6 carbon atoms, andR.sup.2 is alkoxy, alkylthio, alkylamino or dialkylaminoWhich possess arthropodicidal and nematicidal properties.

Abstract: 1-Methyl-1,2,5,6-tetrahydropyridine-3-carboxylic acid esters of the formula ##STR1## wherein R stands for an alkyl group having 3 to 6 carbon atoms, a cycloalkyl group, an alkenyl group having 2 to 6 carbon atoms or an alkynyl group having 2 to 6 carbon atoms,Or a salt thereof.These compounds plus that where R is ethyl are used in combatting insects and acarids.

Abstract: Combating insects, acarids and nematodes with O-ethyl-S-n-propyl-O-(substituted phenyl)-phosphorothiolates of the general formula ##STR1## wherein X is halogen, lower alkyl, nitro, cyano, lower alkylmercapto, lower alkylsulfinyl, lower alkoxycarbonyl or lower alkyl carbonyl, andm is 1, 2 or 3.

Abstract: O-ethyl-S-n-propyl-dithiophosphoric acid phenyl or naphthyl esters, i.e. O-ethyl-S-n-propyl-O- or S-optionally substituted phenyl or naphthyl-phosphorothionothiol- or dithiolates, of the formula ##STR1## in which X is an oxygen or sulfur atom, andZ is a group of the formula ##STR2## Y is a halogen atom or a lower alkyl, lower alkoxy, lower alkylmercapto, lower alkylsufinyl, nitro, cyano or phenyl group, andm is 0, 1, 2 or 3,Which possess insecticidal, acaricidal and nematocidal properties.

Abstract: S-alkoxyethyl-phenyl-di- and -tri-thiophosphonic acid esters of the formula ##STR1## in which R.sup.1 and R.sup.2 each independently is C.sub.1 -C.sub.6 alkyl,X is oxygen or sulfur,Y is C.sub.1 -C.sub.6 alkyl, C.sub.1 -C.sub.6 alkylmercapto or halogen, andn is 1 or 2,Which possess insecticidal, acaricidal and nematocidal properties.

Abstract: O-ethyl S-n-propyl-O-(substituted phenyl)-phosphorothiolates of the general formula ##STR1## wherein X is halogen, lower alkyl, nitro, cyano, lower alkylmercapto, lower alkylsulfinyl, lower alkoxycarbonyl or lower alkyl carbonyl, andm is 1, 2 or 3, which possess insecticidal, acaricidal and nematocidal properties.

Abstract: Certain new cyclohexyl carbamates of the formula: ##EQU1## wherein X is hydrogen, halogen, lower alkyl or lower alkoxy,R is hydrogen or methyl, andn is 1, 2, or 3,Are outstandingly effective herbicides and acaricides and have found particular applicability in selectively combating weeds growing in paddy fields.