Elm zigzag sawfly: Observatree guides

The elm zigzag sawfly (Aproceros leucopoda) is native to eastern Asia but has been spreading in Europe and poses a serious threat to elm trees (Ulmus spp.) in the UK. The sawfly larvae feed on the foliage of healthy trees, and while it is thought that infestations do not cause fatality to hosts, they can reduce their productivity and vitality and make them more vulnerable to other pests and diseases