Insecticidal Ureas and thioureas

摘要

Certain organic compounds derived from urea or thio-urea having insectical activity and methods of their preparation are disclosed. The compounds according to the invention have been found to interfere with the mechanism of metamorphoses which occurs in insects. Hence, the substances according to the invention are specifically active against insects. Owing to this specificity and because of the absence of phytotoxicity effects, the compounds of this invention are of prime importance.