Cladius difformis, the bristly rose slug, is a species of common sawfly in the family Tenthredinidae. The insect will feed on the underside of the leaf in early stages of life. Young larvae (1/2 inch long) are greenish-black, elongated, slim and slug-like, with very little evidence of legs. Although they resemble caterpillars more than slugs, bristly roseslugs (Cladius difformis) are nether one. The early feeding damage causes “windowpanes” of transparent leaf tissue on the leaf as the larvae feed on the surface of the leaf. They go through several generations a year. When fully mature, pear sawfly larvae resemble green-orange caterpillars. Lacy leaves that eventually turn brown on roses may be a clue that rose slugs, actually a sawfly, are dining on your plants.. A close look at the underside of the leaves, especially at night, may reveal the culprit. The family, Tenthredinidae has more of the commonly encountered sawflies in the landscape including the roseslug sawfly. This insect is really small and can be easily overlooked as its coloration will be similar to the leave itself. Look for a slimy green worm-like insect that looks like, but is not a slug or caterpillar. Can cause damage to roses, raspberries and strawberries. Rose Sawfly/Rose Slug . The larvae grow up to ¾ inches in length. Pupa, ventral view . The two mainly seen in Iowa are the roseslug and bristly roseslug. Larva . Rose sawfly (sometimes called rose slug) larvae are a common pest of roses. The roseslug sawfly (Endelomyia aethiops) is an insect native to Europe that often causes damage on leaves of wild and cultivated roses in May and June. Leaf blotches during May and June are a telltale sign or symptom of the Roseslug Sawfly. Some leave holes or notches in the leaves, while others skeletonize the leaves by completely devouring the tissue between the veins. Larvae are yellow-green caterpillar-like insects with an orange head. Rose Slug Sawfly. Ragged holes and skeletonized rose leaves are tell-tale signs of rose slug damage, also referred to as rose Tiny sawfly yellowish-green larvae feed on the green leaf tissue between leaf veins. There are three main species of roseslug, the bristly roseslug, the roseslug, and the curled roseslug. They are velvety, yellow-green in color and up to 1/2 inch long. The roseslug is a sawfly larva (plant-feeding wasp). References. (Johnson and Lyon, 1991). Figure 1. As the slugs grow, they become lighter colored. Sawflies. Conifer sawflies, for instance, are found in coniferous trees, such as pine and spruce. As the larvae grows larger, the feeding damage begins … About 10 show signs of sawfly larvae damage each year, but it only affects a few leaves before hand-picking or their natural enemies (wasps, birds, etc.) Appearance: Roseslug sawfly adults are fly-like insects with two pairs of wings. All three sawfly species feed on only roses (Rosa sp.) 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