Understanding Leatherjackets and Their Effects Crane fly larvae, or immature crane flies, reside in the soil and attack grassroots and decomposing plant matter. Activity peaks in the transitional seasons, often resulting in thinning turf and increased surface vulnerability. On sports fields, this can interfere with play and increase upkeep requirements. https://sports-ground-contractors31863.onesmablog.com/h1-proactive-methods-for-controlling-crane-fly-larvae-and-improving-turf-health-h1-79785145