Crane flies
soil begins to warm up in spring. The larvae pupate below the soil surface in summer. The pupal stage lasts about two weeks. Recommended for you Plant Pests [...] Eggs are black in colour, oval, 1mm long and deposited on the soil surface. Larvae are cylindrical, tapering toward the head, and grey-brown in colour. Larvae [...] emerge from the soil in late summer to fall, and females mate and lay 200-300 eggs. Larvae emerge within one week and then feed on roots and crowns of grasses