To provide an oil-based pesticidal suspension which suppresses foaming al the rime ofpreparation of a spray liquid by an organic silicone type surfactant, and which has excellent pesticidal activity with a small amount of an agriculrural chemical. The present invention provides an oil-based pesticidal suspension comprising (1) flonicamid or its salt, an organic silicone type surfactant and (3) at least one oil-based diluting agent selected from the group consisting of a vegetable oil and its allcylated oil, and a method for controlling pests, which comprises applying the oil-based pesticidal suspension ta the pests or ta a place where they grow.
