If the leaves of your rose have ugly little brown window-pain-like spots, or are getting holes in them, the culprit causing the damage is most likely rose sawfly larvae. Sawflies are yet another common garden insect that we see nearly every day on the farm. If you inspect the leaves closely you will see the culprit! During the months of May and June in the Northeast you may have noticed leaf discoloration in the form of blotches on your rose leaves (Figure 1). Rose sawfly (sometimes called rose slug) larvae are a common pest of roses. The natural insecticide spinosad will control sawfly larvae. A sawfly is a primitive wasp-like insect. It is a small, narrow bodied larva called the roseslug sawfly… The early feeding damage causes “windowpanes” of transparent leaf tissue on the leaf as the larvae feed on the surface of the … It’s simply a larva of the rose sawfly. As the slugs grow, they become lighter colored. When to Spray Roses With Spinosad for Sawfly. The adult (1/5 inch long) is a black and yellow, 4-winged non-stinging wasp (sawfly… Rose slugs are most frequently … Since these larvae don’t have a hard outer shell, spraying them with soap water will mess them up. They are the larvae of primitive wasps called sawflies. Find out more from Hedgerow Rose. The rose slug skeletonizes leaves on roses. Bt (Bacillus thuringiensis), which is an effective natural control for true caterpillars, is ineffective on sawfly … The sawfly larvae LOOK like caterpillars to the uneducated eye but they are not. They are both the larval stage of flying insects known as sawflies. As the weather finally warms up the bad bugs show up. Insects also find these bushes charming, and can quickly infest and damage a rose bush. But in actuality, a rose slug is neither a true slug nor a caterpillar (which becomes a moth or butterfly). Closely related to ants, bees, and wasps, the name “sawfly” refers to the shape of the female flies’ “ovipositor”, which she uses to saw into plants, in order to create a place in which to deposit her eggs.The sawfly … They secrete a slimy substance over their body surface that makes them resemble small slugs. Although there are sawfly species that attack many different plants—from hibiscus to pines to hollyhocks—this particular species is commonly known as rose slugs. The females have a saw-like blade at the tip … Rose bushes are beautiful plants that make a lovely addition to nearly any landscape. There are three species: the bristly rose slug (Cladius difformis), the European rose slug … Several of our customers mistook the damage for a disease. Roses (Rosa spp.) Put it in a spray bottle and spray it all over your rose … Rose sawflies are yellow-green in color and can grow to a ¾ inch maximum length, while pear sawflies … Use Organic Soap Spray. The Roseslug Sawfly, Endelomyia aethiops. A sawfly is a primitive wasp-like insect. It’s simply a larva of the rose sawfly. Take some natural Ivory liquid soap and mix it with water, 1 tsp soap to 6 oz of water. When fully mature, pear sawfly larvae resemble green-orange caterpillars. Young larvae (1/2 inch long) are greenish-black, elongated, slim and slug-like, with very little evidence of legs. The best time to control sawflies is early in their larval stage. Conventional insecticides such as malathion are also effective. While there are several retail rose bush sprays, these can be costly and many times too expensive for a home … Rose slugs look more like caterpillars than slugs. S simply a larva of the rose sawfly the larval stage don t... With water, 1 tsp soap to 6 oz of water the stage... Find these bushes charming, and can quickly infest and damage a bush. They secrete a slimy substance over their body surface that makes them resemble slugs... 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