The purpose of the present invention is to provide a control agent and a control method that immediately control pests including gastropods and annelid worms, and are highly safe for humans,
livestock, pet animals, and birds. The present invention provides a
pest control agent which contains nicotinic acid or a derivative thereof as an
active ingredient. The nicotinic acid or a derivative thereof is preferably nicotinic acid or
nicotinic acid amide, and is preferably a mixture that contains at least both nicotinic acid and
nicotinic acid amide. The
dosage form of the control agent is preferably any one of a liquid agent, a
stock solution-spraying agent, an
aerosol agent, a
solid agent, a tablet, a
powder agent, a granule agent, a bait agent, and an agent to be used by impregnation. The
dosage form preferably contains 0.001-30 wt% of nicotinic acid or a derivative thereof. The present invention also provides a
pest control method in which a stock
powder or a
stock solution of the
pest control agent is diluted with water so as to be 1-100,000 ppm, and then sprayed or impregnated for use.