Stable co-formulation of benzoylurea with pyrethroids

A process of encapsulation of lambdacyhalothrin, said process comprising:

• a. preparing an organic phase comprising a lambdacyhalothrin solubilized in soybean oil, and polymethylene polyphenylisocyanate;
• b. preparing an aqueous phase comprising water and monopropylene glycol;
• c. mixing the aqueous and organic phases to form an oil in water emulsion;
• and
• d. adding ethylene diamine and diethylenetriamine to said oil-in-water emulsion to trigger an interfacial condensation between said polymethylene polyphenylisocyanate in the organic phase with the ethylene diamine, diethylenetriamine and/or monopropylene glycol in the aqueous phase to form a polymeric shell wall.