PURPOSE: To obtain a suspended fluid acaricide, improved in dispersion and suspension stability, spraying efficiency, safety, etc., by blending a specific mixed acaricide with respective specified dispersing agent, suspension stabilizer, suspending agent, organic solvent and water in a specific proportion.

CONSTITUTION: The above-mentioned acaricide, consisting of (A) 10-25wt.% 2-(p-tert-butylphenoxy)cyclohexyl-2-propynyl sulfite, (B) 5-20wt.% 3,6-bis(2- chlorophenyl)-1,2,4,5-tetrazine, (C) 1-5wt.% polyoxyethylene alkyl(phenyl) sulfate salt, etc., (D) 1-5wt.% polyoxypropylene/polyoxyethylene block polymer, (E) 0.05-0.5wt.% polyacrylic acid, etc., (F) 5-25wt.% solvent, compatible with the ingredient (A) and sparingly soluble in water and the remainder of water, capable of stabilizing dispersion and suspension of a mixture of the ingredients (A) and (B) which are difficult to formulate though with great effects, such as extension of a spectrum, by using the ingredients (B) to (F) in combination and having the afore-mentioned effects.