Lambda-cyhalothrin micro-capsules have been prepared by a novel in situ pro
cedure. Manipulation of the chemistry has led to slow- and fast-release for
mulations. The latter has a biological performance comparable to commercial
lambda-cyhalothrin emulsifiable concentrates, but exhibits a significantly
improved toxicological profile over EC, WP and WG formulations. Microencap
sulation technology satisfies many of the drivers towards the safer use of
pesticides. (C) 2001 Society of Chemical industry.