The present invention relates to a liquid composition containing a polyorganosiloxane, a larvicide, which contains temephos, spinozad, dinetofuran, methopren, Bacillus thuringiensis, Bacillus thuringiensis israelensis, or Bacillus sphaericus, and at least 10 wt % of a water-immiscible synthetic organic solvent. It also relates to a method for preparing said composition comprising mixing the polyorganosiloxane, the larvicide, and optionally the further components； and to a method for controlling insects, wherein the said composition is applied on a water surface.
