What Are Crane Fly Larvae? Crane fly larvae, or immature crane flies, nest in the soil and consume grassroots and decomposing plant matter. Activity peaks in mild weather, often resulting in thinning turf and increased surface vulnerability. On grounds in use, this can interfere with play and increase upkeep requirements. https://trentondfeca.blogzet.com/h1-proactive-methods-for-managing-crane-fly-larvae-and-improving-turf-health-h1-53515198