Understanding Leatherjackets and Their Effects Crane fly larvae, or immature crane flies, reside in the soil and feed on grassroots and decomposing plant matter. Activity peaks in spring and autumn, often resulting in patchy turf and increased surface vulnerability. On sports fields, this can interrupt play and increase upkeep requirements. https://school-grounds-maintenanc87530.pointblog.net/h1-sustainable-methods-for-managing-crane-fly-larvae-and-protecting-turf-health-h1-87503218