To be found on berberis and mahonia plants . It flies around Alder. Plants affected. The large alder sawfly (cimbex connatus) was discovered at Lackford Lakes near Bury St Edmunds. Sawfly Larvae Look Like Caterpillars . The Garden Safari website has excellent information on the Large Rose Sawfly. Arge berberidis berberis sawfly First British record was in Essex in 2002, since when it has been recorded in most southern counties, and NBN has it in Yorkshire and South GMC. Abia sp. Abia sp. The best way to tell sawfly larvae from moths and butterfly caterpillars, is sawflies have more legs and their heads usually look a little different. Oak sawflies often leave the thin upper epidermis of the leaf intact as well, but this quickly dessicates and falls from the leaves, creating the characteristic skeletonized look. Sawflies are a large and heterogeneous group in the hymenoptera, the order that includes stinging insects such as bees ants and wasps, although sawflies are harmless. Hi again Richard, We are glad we could help. Sawflies affect a number of different plants but different types tend to affect different crops. You can tell so by looking at the number of wings (Sawflies have 4 wings, flies only 2) and also the head is identical. If a large number of larvae are present, the canopy of affected trees can suddenly turn brown. Sawflies are a group of flies, whose larvae look very similar to caterpillars. Eriocampa ovata (Alder Sawfly) The adult sawfly has a black head and abdomen and dark orange thorax. How to Get Rid of Sawflies. As its name suggests, it is an excellent mimic of the hornet, but is harmless to humans. The larvae feed on elm and willow. A light infestation may cause only a little cosmetic damage that is easily removed through pruning, while a large number of sawflies can seriously damage or even kill a tree. The control of sawflies is directed at the feeding larvae. The larvae are usually 1-4 cm long, but come in an impressive variety of colours. At first glance, you might think you've got a caterpillar problem, but sawflies have behavioral and morphological differences that differentiate them from Lepidopteran larvae. It is the first time the 2cm insect with a wingspan of 5cm … The most common North American species is the elm sawfly (Cimbex americana), a dark blue insect about 2.5 cm (1 inch) long. Update: July 27, 2014 Subject: Large Rose Sawfly July 27, 2014 7:23 am regards from the UK Richard. The larvae sometimes become a plague, especially in pines, cherries, pears or roses (rose slugs). Thanks so much for writing back with the species name Arge pagana for the Large Rose Sawfly. Sawflies are the insects of the suborder Symphyta within the order Hymenoptera alongside ants, bees and wasps. Gardeners most often encounter sawflies when the larvae feed on their plants. I also note that many have rather large eyes for a larva. Cimbicid sawflies (Cimbicidae) are large, robust insects easily recognized by their club-shaped antennae. At almost 2cm long, the hornet mimic hoverfly is the largest hoverfly species in the UK. The family to which Cimbex belongs has characteristic clubbed antenna. Sawflies however are very primitive wasps and they lack the typical wasp waiste. Sawflies are related to wasps and not to flies. One way to spot a sawfly larva is to count the legs - they also have six true legs, but usually have six or more pairs of the stumpy 'prologs', whereas caterpillars have five or fewer.