Insecticidal soaps have no residual action, so the solution must make direct contact with rose slugs in order to be effective. Insecticidal soaps are also effective, but test a small spot on the affected rose a few days prior to treatment to check for sensitivity. A forceful spray of water out of a garden hose can also provide control by knocking off and killing many of the soft-bodied larvae. I have the same problem on my roses and could not find the problem source. Don’t know what they were since they were planted before we bought our house. EDIT: This summer I’ve stopped spraying my roses at all. In other words, just because something says it’s organic doesn’t mean it’s safe in all aspects. Rose stem sawfly (Hartigia trimaculata) larva in a rose stem Sawflies are mostly herbivores , feeding on plants that have a high concentration of chemical defences. 7 rose bushes, two peonies, lavender, cranesbill, sedum, sweet william, oxalis, crocus, tulips, yarrow, phlox, gaura, and so many more. And as far as controlling sawfly larvae I still feel the best method is just to squish the ones you find and let the birds take care of the rest. And two, because certain pesticides will also eliminate beneficial insects (and birds) which, trust me, you want in your garden. Early detection, handpicking and destroying the larvae, and encouraging beneficial insects are 3 great ways to protect your roses from sawfly larvae. Additionally, remove any damaged/diseased canes and leaves and dispose of them (not in your compost pile!) 1. Adult sawflies deposit eggs on the undersides of leaves.To prevent and control infestations, in mid spring inspect both leaf surfaces. Control is the same for all three species. Arregggghhhh!!! Don’t forget to periodically check your roses, paying special attention to the tender new leaves and buds. Start looking for sawfly larvae on the lower surfaces of your rose leaves in mid-spring. Pear sawfly: Adult sawflies emerge in late spring and lay their eggs on the underside of host plant leaves. For more information on Neem, click here. When hatched, the larvae begin to feast while enclosed and protected in the curled leaf! A ladybug larvae hard at work on a Dr Huey rosebud. Oh my gosh Ginger! This picture was taken pre-squish. I’ve heard lots of gardeners talk about the success they’ve had with adding beneficial nematodes to their soil. The Rose Leaf-Rolling Sawfly is an insect that's closely related to the wasps, bees and ants. As for watered-down Neem oil, I don’t even use that anymore. . Sawfly larvae resemble a caterpillar but are actually the larvae of the sawfly, a wasp-like flying insect. The contact insecticide carbaryl (click for sources)) offers good control if sprayed on the whole rose. Larvae that are discovered while they are still small can be effectively controlled with any rose insecticide spray or dust. Control heavy sawfly feeding by spraying your roses with membrane-disrupting insecticidal soap. They secrete a slimy substance over their body surface that makes them resemble small slugs. Moms are the best! My poor rose plant was infested by rose slugs, and after using chemical pesticide, which didn’t work, I came to the same conclusion as you. Read and follow label directions. Organic Materials Review Institute (OMRI™), Rose slug, a sawfly larva (Hymenoptera), on underside of rose (, Rose slug (Hymenoptera), a type of sawfly larva, and damage on underside of rose leaf (, The rose slug is a sawfly larva not a caterpillar and cannot be controlled with, Rose slug (Hymenoptera), a type of sawfly larva, and typical skeletonized damage on upper leaf surface of rose(, Adult pear sawfly / pear slug (Hymenoptera) found on a rose leaf (, Rose slug, a sawfly larva (Hymenoptera), and feeding damage on upper leaf surface of rose (. Imidacloprid (click for sources)) is a systemic which can be applied to the soil around the roses in spring before feeding activity is noticed. Encourage predators and other natural enemies of sawfly in the garden, such as birds and ground beetles. Insecticidal soaps, horticultural oil, and pyrethrin are labeled for sawfly control. 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