none The insect growth regulators (IGRs) diflubenzuron and BAY SIR 8514 were evaluated for their effects on three beneficial insect species associated with peach: Chrysopa oculata (Neuroptera: Chrysopidae), Acholla multispinosa (Hemiptera: Reduviidae), and Macrocentrus ancylivorus (Hymenoptera: Braconidae). Both topical treatment and contact with IGR-treated leaves caused significant mortality and inhibition of moulting of 1st-instar C. oculata . These same treatments had no such effects on 1st-instar A. multispinosa . IGR-treated prey fed to C. oculata or A. multispinosa had no adverse effects on these predators.