Larvae can be removed by hand and disposed of. If you come across eggs on your stems, you can also destroy these by either cutting away the stems and disposing of them or trying to scrape the eggs off, making sure to get them all.
For large infestations, another tip for removing larvae would be to spray down plants and trees with a power hose. Place a white towel or sheet below plants to ensure all larvae are collected and relocated or disposed of.
Neem or spinosad can be effective. Similarly, homemade or store-bought insecticidal soaps and horticultural oils are thought to offer some protection if your infestation is moderate to severe. If infestations are caught early, no product should need to be used at all.
Restrict applications to cooler parts of the day, taking care not to spray any flowering plants.
Please read bottle label instructions prior to application.
Birds, frogs, lizards and parasitic flies and wasps will prey upon sawfly adults and larvae. Attract these into your garden by allowing areas to grow a little wild, or mow and trim back plants less often. Hanging baskets, climbing plants and log piles are great spaces for beneficial wildlife to take cover during the day.