Published records of diamondback moth (Plutella xylostella) biological control on the California Central Coast are generally absent. This project consequently sought to verify and characterize diamondback moth parasitism by the specialist endoparasitoid Diadegma insulare from the various baby trial sites in Monterey, Santa Cruz and San Benito Counties. Diamondback moth parasitism was consistently documented throughout the coastal region, with annual parasitism ranging from 55.3-70.0% (Table 2).