| abstract |
A microencapsulated pyrethroid insecticidal and/or acaricidal composition, e.g. for agricultural uses, comprises at least one pyrethroid compound encapsulated in a wall of a synthetic polymer and has an average particle diameter of not more than 80 micrometers, wall thickness of not more than 0.3 micrometer, and average particle diameter/wall thickness ratio of not less than 250. It exhibits a good residual efficacy and reduced fish toxicity. |