TO PROVIDE A PESTICIDAL COMPOSITION HAVING A STABLE AND HIGH PESTICIDAL EFFECT. THE PESTICIDAL COMPOSITION COMPRISES A PYRIDINE COMPOUND REPRESENTED BY THE FORMULA (WHEREIN R1 IS CH2CN OR AND EACH OF R2 AND R3 WHICH ARE INDEPENDENT OF EACH OTHER, IS A HYDROGEN ATOM, A HALOGEN ATOM, C1-6 ALKYL OR C1-6 ALKOXY) OR ITS SALT AND AT LEAST ONE POTENCY-ENHANCING COMPONENT SELECTED FROM THE GROUP CONSISTING OF A NONIONIC SURFACE ACTIVE AGENT, AN ANIONIC SURFACE ACTIVE AGENT, A CATIONIC SURFACE ACTIVE AGENT, AN AMPHOTERIC SURFACE ACTIVE AGENT, AN ANIMAL OR PLANT OIL, A MINERAL OIL, A WATER-SOLUBLE POLYMER, A RESIN AND A WAX.