The larvae are 7-8mm long. Because these larvae often use a slimy substance to help them adhere to the underside of the leaves, they are sometimes called the oak slug sawfly. Another Willow Sawfly (Nematus calais, here doing a pretty thorough job on a poplar) is green with black speckles and larger yellow spots along the side. Oak slugworms are the larvae of a sawfly. Pear sawflies feed on hawthorn, serviceberry, pear, and other members of the rose family. The slug oak sawfly is usually an endemic pest of red and white oaks. The internal green line from stem to stern is plant material going through their gut. The adult sawflies have black bodies about 7-8mm long and two pairs of blackish transparent wings, they emerge during spring. Oak sawflies are being found on white oak. The larvae of sawfly species, oak slugs, get their name from their resemblance to the legless molluscs, slugs, but are actually in the insect family Tenthredinidae in the order Hymenoptera which includes bees and wasps. 0000001326 00000 n Oak slug sawfly, also known as the scarlet oak sawfly, feeds on scarlet, pin, black and white oaks.As larvae they are slug-like in appearance and even have a coating of slime to adhere to leaves. The damage done is usually temporary (albeit alarming); healthy trees can sprout new leaves. A week later they were a bit larger (they max out at about ½”), and they had developed startling black “eye-spots” on their heads (the wide end) which made them look like Snoopy’s “Joe Cool” character wearing shades. Young larvae (1/2 inch long) are greenish-black, elongated, slim and slug-like, with very little evidence of legs. Oak slug sawflies feed in groups on the undersides of oak leaves. Oak sawflies are yellow and green and most often found on pin oak. Eggs are laid on the foliage and they hatch into larvae that are pale green with a slimy slug-like appearance. Alternate names like “slug sawfly” and “oak slug sawfly” testify to the appearance of the 15 or so species of Caliroa larvae and to the self-generated coat of slime that keeps them from falling off of their perches on the undersides of leaves. Despite its name, the Scarlet Oak Sawfly (SOS) makes filigree of the leaves of red, black, pin and white oaks alike. Lots of chemicals are thrown at defoliators, but that pesticide load can adversely affect both non-target species and larva-eating predators. 0000041634 00000 n It is also called the slug oak sawfly because the larvae are covered with a coat of slime that helps them ahdere to foliage. The scarlet oak sawfly, Caliroa quercuscoccineae (Dyar) skeletonizes leaves of scarlet, black, pin, and white oaks in eastern North America.It is also called the oak slug sawfly because of the fact that the larvae are covered with a coat of slime that helps them adhere to foliage. There may be 3 generations during the summer, but control is rarely warranted. It is also called the slug oak sawfly because the larvae are covered with a coat of slime that helps them ahdere to foliage. May Beetle They forage conspicuously in the open, suggesting that they are distasteful (except maybe to Mama Wasp, who stopped for a protein shake). The eggs take a few weeks to hatch (although the eggs are inserted into the leaf’s top side, the larvae exit through the bottom leaf surface), and the artwork of the larvae usually isn’t immediately noticeable. From 1974 to 1976, however, it was epidemic in Kentucky, Virginia, and Tennessee. Scarlet oak sawfly larvae. This pest has been reported from Massachusetts through … Oak slug sawfly larvae cause similar skeletonization of leaves at about the same times that the two OLS generations are present, but there are some noticeable differences. Slug sawflies chew their way across the underside of leaves in a … Identifying the Insect. 0000001070 00000 n 0000003014 00000 n This results in the leaf framework being left behind, a … The slimy-looking larvae feed in groups on the lower surface of the leaves, leaving only a fine network of veins which gives the leaf a transparent appearance. BugFan Mike thinks that the ingredients in the “phantomleaves” site might be a bit hard to come by—chlorate of soda is in the “handle with care” category, and BugFans might have to synthesize the chlorate of lime in their own home laboratories. We have additional information on the following species: Lesser willow sawfly – Nematus pavidus; Rose leaf-rolling sawfly – Blennocampa phyllocolpa; Rose slug sawfly – Endelomyia aethiops; Solomon’s seal sawfly – Phymatocera aterrima There is often more than one generation of scarlet oak sawfly per year, so a new generation of adult scarlet oak sawflies often appears in July or August, mating and … Pear sawfly larvae are greenish black.