| 摘要 |
PROBLEM TO BE SOLVED: To obtain a pest control agent composition inducing slight deteriora tion of a formulation due to separation or growth of a crystal, excellent in preservation stability for a long period of time and useful for a pesticide, a germicide or a herbicide. SOLUTION: The objective pest control agent composition is obtained by including an organic phosphorus-based compound e.g. O,O-diethyl O-3,5,6- trichloro-2-pyridyl phophorothioate (chloropyrifos)} having >=15 deg.C melting point together with a ketone solvent (e.g. methyl isobutyl ketone) in a microcapsule. Preferably, an average particle diameter of the microcapsule is >=30μm, a value of (the average particle diameter/membrane thickness) is 30-200 and a value of (the average particle diameter×membrane thickness) is <=20μm<2> . Further, preferably a weight percent A occupied by an aromatic ring structure in the membrane substance of the microcapsule is <=40% and a ratio of the value of A to the value of (the average particle diameter/membrane thickness) of the microcapsule is 0-0.8.
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