Cocoons are then spun on trees or among soil litter. Some of these cocoons overwinter, but adult sawflies emerge from others and produce a partial third generation in late fall. However, most of these late larvae, as well as prepupae in cocoons on trees, are killed by low winter temperatures. Cocoons among soil litter have the best chance of surviving the winter. The treatment of large areas of trees is not practical, but small, localized infestations can be controlled.
Pesticides are available for applications to infested yard trees, shurbs, or nursery stock.
Since generations overlap and all life stages may be present at once, rpeated pesticide applications may be necessary to control new sawfly larvae as the emerge. For specific chemical controls, see the current state extension service recommendations.