Both families have long beaks. Nymphs and adults are predaceous. Pholetesor ornigis is a key parasite of tissue-feeding leafminer larvae. It leaves a white cocoon in the mine. Sympiesis marylandensis, Eulophid wasp leafminer tissue-feeding stage larvae Wasp larva is a key factor in leafminer suppression.
Adults also feed on leafminer larvae.
Chalcid wasp species aphids, leafminers, moth eggs and caterpillars, scale insects. In some pest species, chalcid parasitism may exceed 50 percent of the population. Ichneumonid wasp species larvae of moths, butterflies, beetles, sawflies. Adults generally larger than other wasp parasites, with a long ovipositor. Amblyseius fallacis and Typhlodromus pyri , Phytoseiid predator mite species European red mites and twospotted spider mites.