Other kinds of insects (specialised sawflies and aphids) sequester glucosinolates. It is above all pollinated by parasitic wasps, sawflies and beetles. Holling identified this mechanism in shrews and deer mice feeding on sawflies. They are found most frequently on the larvae of moths and sawflies. They are also the only sawflies with carnivorous larvae. Alternative measures to control sawflies can be taken. A number of sawflies feed on spruce trees. Problem insects include aphids, thrips, mites, bud moths, Saskatoon sawflies, and pear slug sawflies. Symphyta includes the sawflies, horntails, and parasitic wood wasps. Also parasitised are bees, wasps and sawflies. It's at least as bad as sawflies in the wheat fields. The family Formicidae belongs to the order Hymenoptera, which also includes sawflies, bees, and wasps. The Hymenoptera also contain the somewhat wasplike but unwaisted Symphyta, the sawflies. Parasitism of sawflies by Eulophids in grass exceeds 50%, but only 5% in wheat. Several species in the family Eulophidae attack sawflies, although their impact is low.