Abstract: The pesticidal compositions comprising synergistic mixtures of O,O-dimethyl S-phthalimidomethyl phosphorodithioate or suitable salt forms thereof, and at least one benzoylurea based chitin inhibiting compound or suitable salt forms thereof, and especially preferably one or more of (RS)-1-[3-chloro-4-(1,1,2-trifluoro-2-trifluoromethoxyethoxy)phenyl]-3-(2,6-di-fluorobenzoyl)urea (also interchangeably referred to as “novaluron”) or suitable salt forms thereof, and 1-(2-chlorobenzoyl)-3-(4-trifluoromethoxyphenyl)urea (also interchangeably referred to as “triflumuron”) or suitable salt forms thereof, for the control of undesired pests, preferably for the control of Codling moths in fruit. Methods of controlling the incidence of undesired pests, via treatment regimens providing synergistic amounts of each of the foregoing compounds, are also disclosed.