What exactly is Spinosad? Is there a brand name for it? It is organic?

Many companies are marketing products with Spinosad as the primary active ingredient. Yes, it is organic. It's a biological bacterium agent that primarily affects chewing insects.

I've tried Rose Pharm spray, and I think it did help. It contains peppermint oil and glycerin.

I recently started using Jungle Rain Clean Leaf Spray for the occasional Japanese Beetle, it might work on sawfly as well.

Dusting with kitchen flour might be something to try.

Spinosad is certified organic by most organic farming regulators. It is a relatively specific insecticide that is most active against sawflies, caterpillars, and thrips, but I wouldn't apply it to open flowers because it is somewhat active against bees.

Rose slugs in my garden are generally controlled by wasps picking them off. Also you can just wipe the underside of infested leaves. Spraying spinosad could be useful on large plants that are susceptible. Brands include Bulls Eye, Fertilome Bagworm Borer, and Monterrey.