Abstract: A process for the preparation of an asymmetric triorganotin halide which is represented by the general formula [III] ##STR1## wherein R represents alkyl or phenyl, R* represents cyclohexyl or neophyl, and X represents a chlorine or bromine atom,which comprises reacting in the presence or absence of an inert organic solvent an asymmetric tetraorganotin compound of the general formula [I] ##STR2## with a tin (IV) halide of the general formula [II]SnX.sub.4 [II]in approximately equimolar amounts to yield a reaction mixture including compounds of the general formula of [III] and [IV] ##STR3## and subsequently, without the isolation of the asymmetric triorganotin halide [III], reacting the reaction mixture with substantially twice the molar amount, based on monoorganotin trihalide [IV], of an ether solution of organomagnesium halide of the general formula of [V]R*MgX [V].

Abstract: A compound of the formula: ##STR1## in which R.sup.1 represents alkyl, cycloalkyl or aralkyl, R* represents fluorophenyl or trifluoromethylphenyl when R.sup.1 is alkyl; R* represents dichlorophenyl, neopentyl, trimethylsilylmethyl, dimethylphenylsilylmethyl or a group of the formula: ##STR2## wherein R.sup.2 represents halogen, trifluoromethyl, lower alkyl or lower alkoxy when R.sup.1 is cycloalkyl; or R* represents 2-thienyl, 3-thienyl, neopentyl, trimethylsilylmethyl, dimethylphenylsilylmethyl or a group of the formula: ##STR3## wherein R.sup.3, R.sup.4 and R.sup.5 independently represent halogen, trifluoromethyl, lower alkyl or lower alkoxy when R.sup.1 is aralkyl, m represents 1 or 2, and X represents halogen, imidazolyl, triazolyl, phenylthio or a radical selected from the group consisting of: ##STR4## wherein R.sup.6 represents alkyl, R.sup.7 and R.sup.8 independently represent lower alkyl and R.sup.9 and R.sup.

Abstract: A compound of the formula: ##STR1## in which R.sup.1 represents alkyl, cycloalkyl or aralkyl, R* represents fluorophenyl or trifluoromethylphenyl when R.sup.1 is alkyl; R* represents dichlorophenyl, neopentyl, trimethylsilylmethyl, dimethylphenylsilylmethyl or a group of the formula: ##STR2## wherein R.sup.2 represents halogen, trifluoromethyl, lower alkyl or lower alkoxy when R.sup.1 is cycloalkyl; or R* represents 2-thienyl, 3-thienyl, neopentyl, trimethylsilylmethyl, imethylphenylsilylmethyl or a group of the formula: ##STR3## wherein R.sup.3, R.sup.4 and R.sup.5 independently represent hydrogen, halogen, trifluoromethyl, lower alkyl or lower alkoxy when R.sup.1 is aralkyl, m represents 1 or 2, and X represents halogen, imidazolyl, triazolyl, phenylthio or a radical selected from the group consisting of: ##STR4## wherein R.sup.6 represents alkyl, R.sup.7 and R.sup.8 independently represent lower alkyl and R.sup.9 and R.sup.

Abstract: An agricultural or horticultural miticidal composition for controlling mites which cause damage to plants, said miticidal composition comprising(1) a liquid carrier and/or a solid carrier, and(2) as an active ingredient, a trialkyltin compound of the formula ##STR1## wherein R.sup.1 represents a linear alkyl group having 6 to 11 carbon atoms, R.sup.2 represents a hydrogen atom or a methyl group, the total number of carbon atoms of R.sup.1 and R.sup.2 is from 7 to 11, m is an integer of 1 or 2, and X represents a chlorine atom, a bromine atom, a fluorine atom, a hydroxyl group, an acyloxy group, a dithiocarbamate group or a group of the formula --SR.sup.3, in which R.sup.3 represents an alkyl group having 1 to 12 carbon atoms or an aryl group, when m is 1, and a member selected from the class consisting of an oxygen atom, a sulfur atom and a sulfuric acid group when m is 2; and a method for controlling mites using the same.