make short work of the rose slugs. Although they resemble caterpillars more than slugs, bristly roseslugs (Cladius difformis) are nether one. 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. Q. Pupa, dorsal view . The roseslug is a sawfly larva (plant-feeding wasp). 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. All three sawfly species feed on only roses (Rosa sp.) As the larvae grows larger, the feeding damage begins … You can see a green sawfly slug on a leaf on the lower right hand side of the photo under the bloom. 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. The insect will feed on the underside of the leaf in early stages of life. The larvae grow up to ¾ inches in length. Can cause damage to roses, raspberries and strawberries. (Some sawfly larvae look even more sluglike than rose slugs; for example, the pear slug, which does a good imitation of a black slug.) The family, Tenthredinidae has more of the commonly encountered sawflies in the landscape including the roseslug sawfly. Appearance: Roseslug sawfly adults are fly-like insects with two pairs of wings. Pupa, ventral view . (Johnson and Lyon, 1991). 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. Cladius difformis, the bristly rose slug, is a species of common sawfly in the family Tenthredinidae. External links. Rose Slug Sawfly. By relying on BTK, you may be increasing the rose slug population. Figure 1. This insect is really small and can be easily overlooked as its coloration will be similar to the leave itself. Young larvae (1/2 inch long) are greenish-black, elongated, slim and slug-like, with very little evidence of legs. 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.) Sawflies. They are velvety, yellow-green in color and up to 1/2 inch long. They go through several generations a year. The adult (1/5 inch long) is a black and yellow, 4-winged non-stinging wasp (sawfly) that is rarely noticed. There are three main species of roseslug, the bristly roseslug, the roseslug, and the curled roseslug. References. When young, its mouth is too small to be able to chew all the way through the leaf. Rose Sawfly/Rose Slug . Conifer sawflies, for instance, are found in coniferous trees, such as pine and spruce. 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