Native to the Palaearctic, probably accidentally introduced in the Nearctic. The (probably) Bristly Rose Slug (Cladius difformis) is found on rose, raspberry, strawberry and some other members of the rose family. The other is the Bristly rose slug, which is covered with small hair-like bristles. The Bristly rose slug will typically feed on the underside of the rose leaves, leaving the translucent lacy layer of the leaf tissue that some rosarians refer to as skeletonizing of the foliage. Figure 3: Damage on Rose Plant Caused by Rose Slug. Symptoms and Effects: Roseslug sawfly larvae feed on the soft tissue of rose leaves leaving the harder tissue (e.g., veins) intact, a feeding pattern called skeletonization. Most of the feeding activity on roses in Maryland is seen in May and June, but sawfly larvae can continue to be active until fall. When to Spray Roses With Spinosad for Sawfly. Bristly rose slug larvae feed on the underside of rose leaves and also cause leaves to appear skeletonized. Laguna Beach, Orange County, CA. They go through several generations a year. Female sawflies (the adult life stage of rose slugs) lay individual eggs in slits along the margins of leaves. After eating the lower surface, they chew big holes in the leaf but leave its veins. However, the larvae may chew larger holes than the rose slug. Description of rose sawfies . There are three main species of roseslug, the bristly roseslug, the roseslug, and the curled roseslug. Roses (Rosa spp.) The roseslug is a sawfly larva (plant-feeding wasp). Cladius difformis, the bristly rose slug, is a species of common sawfly in the family Tenthredinidae. The curled roseslug was the most distinctive in that it was always curled like a naked snail and attached to the undersides of the leaves. Rose slugs will eat up roses like crazy. The bristly rose slug will eat up your leaves and leave them in skeletonized tissue. Cladius difformis, the bristly rose slug, is a species of common sawfly in the family Tenthredinidae. Larger, older rose slugs chew holes right thru the leaf. The roseslug sawfly is one of three common sawflies that attack roses (others are curled and bristly roseslugs). Bristly Rose Slug. They are about 1/2" long and yellow-green with yellow heads. The bristly rose slug is usually covered with many short hairs, while the other two species are smooth. © Peter J. Bryant Bristly Roseslug Sawfly. They live here, but they’re probably not native to North America. Can cause damage to roses, raspberries and strawberries. They live here, but they’re probably not native to North America. The two mainly seen in Iowa are the roseslug and bristly roseslug. Adults of all three species resemble wasps and are about 1/4" long. Bristly Rose Slug. Sawflies and their larvae tend to be a popular pest for roses. 5/28/07. This particular post has short stiff hairs with green bodies and dark heads. Sawflies. The other two are the bristly roseslug (Cladius difformis), which produces five to six generations per year, and the curled rose sawfly (Allantus cinctus), which is the largest of the three and is a leaf skeletonizer as well as a cane borer producing only two generations per year (Johnson et al, 1989; Cranshaw, 2004). Another Willow Sawfly There are 3 species of Rose Slug that may be your culprit: the European rose slug (Endelomyia aethiops), the Bristly rose slug (Cladius difformis), and the Curled rose sawfly (Allantus cinctus). What do Rose Slugs look Like? In Maryland, there are three species of rose slug sawflies that cause damage to roses: the bristly rose slug sawfly, the rose slug sawfly, and the curled rose sawfly. The (probably) Bristly Rose Slug (Cladius difformis) is found on rose, raspberry, strawberry and some other members of the rose family. Although they resemble caterpillars more than slugs, bristly roseslugs (Cladius difformis) are nether one. As their common name indicates, bristly roseslug sawfly larvae are covered with short, hair-like bristles that can be best seen with a hand-lens. Figure 4: Damage on Rose Leaf Caused by Rose Slug. Male, 6mm bl. Damage typically first appears in early to mid-May and can continue through mid-June (or possibly slightly later in northern parts of Wisconsin). Can cause damage to roses, raspberries and strawberries. In fact, the rose slug sawfly is aptly named just because it eats up rose bushes. Life cycle In early June I found bristly rose slugs feeding on wild and cultivated rose bushes in central California and about the same time I found all three species of roseslugs feeding on wild roses in southern Oregon. (Some sawfly larvae look even more sluglike than rose slugs; for example, the pear slug, which does a good imitation of a black slug.) Native to the Palaearctic, probably accidentally introduced in the Nearctic. When fully grown, rose slugs closely resemble butterfly or moth caterpillars. Despite their common name, the larvae of roseslug sawflies resemble tiny caterpillars and look nothing like the glistening, elongated pear-shaped "slug sawflies" which do resemble tiny slugs. Mature larvae look like caterpillars, but they are not. Although they resemble caterpillars more than slugs, bristly roseslugs (Cladius difformis) are nether one. Another Willow Sawfly They are velvety, yellow-green in color and up to 1/2 inch long. After eating the lower surface, they chew big holes in the leaf but leave its veins. They go through several generations a year. Sawflies. Cladius difformis . Life cycle Both are the larvae of plant feeding wasps known as sawflies.

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