Crane flies
feed on roots and crowns of grasses during the autumn.. Larvae overwinter in the soil, usually in the third instar stage. and start feeding again in spring [...] General The larvae of crane flies , called leatherjackets, live in the soil and feed on roots and shoots (which they pull into the ground of mainly grasses [...] They become active again and feed voraciously when the soil begins to warm up in spring. The larvae pupate below the soil surface in summer. The pupal stage