| 摘要 |
<p>An aqueous suspension of a microcapsular insecticidal composition is obtained by emulsifying a liquid pyrethroid insecticide or a hydrophobic solution comprising a pyrethroid insecticide and a high-boiling solvent, preferably an alkyl phthalate wherein the alkyl group has 8 to 13 carbon atoms, in the presence of a water-soluble anionic polymeric surfactant to obtain liquid particles having appropriate diameters and polycondensing melamine-formaldehyde or its derivative on the surfaces of the obtained particles. This composition has a prolonged stable insecticidal effect and is reduced in the toxicity against aquatic animals.</p> |
