Crane Fly Larvae and Turf Damage Crane fly larvae, commonly referred to as grubs, exist in the upper layers of soil, where they feed on grassroots and organic material. Their presence is most problematic in spring and autumn, and their activity can lead to spongy ground and weakened turf condition. https://school-field-renovation20752.blogpixi.com/39046930/h1-managing-crane-fly-larvae-for-reliable-turf-surfaces-h1