Abstract: An acaricidal composition comprising as active ingredients(A) either .alpha.-cyano-3-phenoxybenzyl 2,2,3,3-tetramethylcyclopropanecarboxylate or .alpha.-cyano-3-phenoxybenzyl N-(2-chloro-.alpha.,.alpha.,.alpha.-trifluor o-p-tolyl)-valinate, and(B) O,O,O',O'-tetraethyl S,S'-methylene bis(phosphorodithioate), is very effectively applicable as a composition for controlling acarine pests such as two-spotted spider mite (Tetranychus urticae Koch), carmine spider mite (Tetranychus cinnabarinus Boisduval), Kanazawa spider mite (Tetranychus Kansawai Kishida), citrus red mite (Panonychus citri McGregor), European red mite (Panonychus ulmi Koch), broad mite (Polyphagotarsonemus latus Banks), etc. in areas cultivated with fruit trees, tea-plant, vegetables, flowering plants, etc.

Abstract: A microencapsulated insecticidal composition has excellent residual effect which comprises an organophosphorus insecticide encapsulated in a wall formed of a polyurea and having an average particle diameter of not more than 80 .mu.m, a wall thickness of not more than 0.3 .mu.m and a ratio of an average particle diameter/wall thickness of not less than 250.

Abstract: A dithiolphosphoric acid ester of the formula, ##STR1## wherein R is methyl or ethyl group, and when R is methyl group, A is iso-butyl, sec-butyl or tert-butyl group and B is methyl, ethyl or n-propyl group, when R is ethyl group and A is sec-butyl or tert-butyl group, B is methyl group, and when R is ethyl group and A is iso-butyl group, B is methyl, ethyl or n-propyl group, which is useful as a soil pesticidal composition for pests in soil.

Abstract: A dithiolphosphoric acid ester of the formula, ##STR1## wherein A is sec-butyl or tert-butyl group, and B is iso-propyl, n-butyl, iso-butyl, sec-butyl or tert-butyl group, which is useful as a soil pesticidal composition for pests in soil.

Abstract: An insecticidal composition which comprises as an active ingredient a compound of the formula: ##STR1## wherein X is a hydrogen atom or an acyl group, Y is a hydrogen atom, a lower alkyl group or a halogen atom and R.sub.1 and R.sub.2, which may be the same or different, are each a hydrogen atom, a lower alkyl group, a cyclo(lower)alkyl group, a lower alkenyl group, a lower alkynyl group, a lower alkoxy group or an acyl group, provided that R.sub.1 and R.sub.2 are not simultaneously a hydrogen atom or an acyl group.

Abstract: The present invention relates to insecticidal compositions of low toxicity to fishes and mammals characterized by containing m-(p-bromophenoxy)-.alpha.-cyanolbenzyl trans- or trans-rich-2,2-dimethyl-3-(2,2-dichlorovinyl)cyclopropanecarboxylate of the formula (I), ##STR1## and at least one of the organo-phosphoric esters of the formula (II), ##STR2## wherein R.sub.1 and R.sub.2 are each a C.sub.1 -C.sub.3 alkyl group, X.sub.1, X.sub.2 and X.sub.3 are each an oxygen or sulfur atom, Y.sub.1 and Y.sub.2, which may be the same or different, are each a C.sub.1 -C.sub.3 lower alkyl, methylmercapto, cyano or nitro group or a halogen atom, Z is a carbon or nitrogen atom and n is 0 or 1, in a ratio of 1 to 1-100 (part by weight) of the former to the latter, and insecticides obtained by mixing said compositions with a carrier or a diluent and if necessary an additive. The term "trans-rich" shows the ratio of trans/cis is not less than 75/25.

Abstract: The present invention relates to insecticidal compositions of low toxicity to fishes and mammals characterized by containing m-(p-bromophenoxy)-.alpha.-cyanobenzyl trans- or trans-rich-2,2-dimethyl-3-(2,2-dichlorovinyl)cyclopropanecarboxylate of the formula (I), ##STR1## and a carbamic ester of the formula (III), ##STR2## wherein R is a group of the formula, ##STR3## in which X is a C.sub.1 -C.sub.4 alkyl or C.sub.1 -C.sub.4 alkoxyl group and n is 1 or 2, in a ratio of 1 to 1-100 (part by weight) of the former to the latter, and insecticides obtained by mixing said compositions with a carrier or a diluent and if necessary an additive. The term "trans-rich" shows the ratio of trans/cis is not less than 75/25.

Abstract: A novel substituted-arylacetic acid ester of the formula, ##STR1## wherein R.sub.1 and R.sub.2 are each hydrogen or a halogen atom, a C.sub.1 -C.sub.4 alkyl, C.sub.2 -C.sub.4 alkenyl, C.sub.1 -C.sub.4 alkoxy, cyano, nitro, methylthio, C.sub.1 -C.sub.4 alkanoyl, C.sub.1 -C.sub.4 alkanoyloxy, or C.sub.1 -C.sub.4 alkoxycarbonyl group, or R.sub.1 and R.sub.2, taken together, may form methylenedioxy, a C.sub.3 -C.sub.5 alkylene or butadienylene (--CH.dbd.CH--CH.dbd.CH--) ring; R.sub.3 is a C.sub.2 -C.sub.4 alkyl, C.sub.2 -C.sub.4 alkenyl, propargyl, C.sub.3 -C.sub.6 cycloalkyl or cyclopropylmethyl group; R.sub.4 is hydrogen or a halogen atom, methyl or ethyl group; R.sub.5 is allyl, propargyl, 3-butenyl, 3-butynyl, phenyl or benzyl group; and A is oxygen or sulfur atom or --CH.dbd.CH-- group, which possesses various useful insecticidal and acaricidal activities and can be prepared by reacting a substituted-arylacetic acid of the formula: ##STR2## wherein R.sub.1, R.sub.2, R.sub.

Abstract: The present invention relates to carboxylic esters of the formula (I), ##STR1## wherein X is a chlorine or bromine atom, and their production and use as an insecticide and/or acaricide.

Abstract: An optically active .alpha.-cyano-3-(4-halogenophenoxy)-benzyl 2-(4-chlorophenyl)isovalerate, which consists substantially of or is rich in (S)-.alpha.-cyano-3-(4-halogenophenoxy)benzyl (S)-2-(4-chlorophenyl)isovalerate; a method for preparing the same; and an insecticidal and/or acaricidal composition containing the same.

Abstract: A mixture of stereoisomers of an .alpha.-cyano-3-(4-halogenophenoxy)benzyl 2-(4-chlorophenyl)isovalerate, which consists substantially of or is rich in an enantiomer pair of an (S)-.alpha.-cyano-3-(4-halogenophenoxy)benzyl (S)-2-(4-chlorophenyl)isovalerate and an (R)-.alpha.-cyano-3-(4-halogenophenoxy)benzyl (R)-2-(4-chlorophenyl)isovalerate; a process for preparing the same; and an insecticidal and/or acaricidal composition containing the same.

Abstract: m-(p-Bromophenoxy)-.alpha.-cyanobenzyl trans- or trans-rich-2,2-dimethyl-3-(2,2-dichlorovinyl)cyclopropanecarboxylate of the formula (I), ##STR1## and their preparation and use as a low fish toxic insecticide and/or acaricide.

Abstract: A novel substituted-arylacetic acid ester of the formula, ##STR1## wherein R.sub.1 and R.sub.2 are each hydrogen or a halogen atom, a C.sub.1 -C.sub.4 alkyl, C.sub.2 -C.sub.4 alkenyl, C.sub.1 -C.sub.4 alkoxy, cyano, nitro, methylthio, C.sub.1 -C.sub.4 alkanoyl, C.sub.1 -C.sub.4 alkanoyloxy, or C.sub.1 -C.sub.4 alkoxycarbonyl group, or R.sub.1 and R.sub.2, taken together, may form methylenedioxy, a C.sub.3 -C.sub.5 alkylene or butadienylene (--CH.dbd.CH--CH.dbd.CH--) ring; R.sub.3 is a C.sub.2 -C.sub.4 alkyl, C.sub.2 -C.sub.4 alkenyl, propargyl, C.sub.3 -C.sub.6 cycloalkyl or cyclopropylmethyl group; R.sub.4 is hydrogen or a halogen atom, methyl or ethyl group; R.sub.5 is allyl, propargyl, 3-butenyl, 3-butynyl, phenyl or benzyl group; and A is oxygen or sulfur atom or --CH.dbd.CH-- group, which possesses various useful insecticidal and acaricidal activities and can be prepared by reacting a substituted-arylacetic acid of the formula; ##STR2## wherein R.sub.1, R.sub.2, R.sub.