Wings are smoky brown with brown margins. They are widespread throughout Europe and Siberia. Cimbex femoratus, the birch sawfly, is a species of sawflies in the family Cimbicidae. They LOOK like caterpillars to the uneducated eye but they are not. In July, groups of larvae can be readily observed around the leaves, which they consume right down to the midrib. In the garden, they are often feeding on the pollens of flowers. The adults fly in May to August. These sawflies prefer areas where Birch trees can be found. 'Birch Sawfly' larvae (Croesus septentrionalis) on a leaf. F.'g. Figure 192.—Larvae of the dusky birch sawfly, Croe- sus latitarsus. Sawfly larvae Croesus septentrionalis feeding on a birch leaf. The yellow-green with black heads and black blotches on their sides grow up to an inch long. Entomological Society of Ontario; Insect pests; Insects. Dusky birch sawfly, Croesus latitarsus, is a native species only found on birch. EXPT. Achillea millefolium and Cimbex femoratus - common yarrow, is a flowering plant in the family Asteraceae. Dusky birch sawfly larvae group eating River Birch leaf. Copyright © 27/11/2020 Alamy Ltd. All rights reserved. The antennae are black at the base and yellow-orange at the tip. The thorax is shiny black. They are worm-like and crawl around like worms and have many different patterns. The river birch “caterpillars” are not caterpillars at all. Larvae are pale bluish-green, about 45 mm long and they look very similar to caterpillars. Leaf-roll on balsam poplar, associated with aphids, was noted from North Bay to Sault Ste-Marie, centering around Thessalon, Ont. The adults fly in May to August. The river birch “caterpillars” are not caterpillars at all. Because there are many species, they thrive almost anywhere and affects a wide array of plants. Habitat Wings are smoky brown with brown margins. There is a single row of black dots along the side of the body. The first generation larvae feed from May to early July. In our yard, we have mugo pines, and the sawfly larvae are a consistent problem from year to year, eating away at the needles. They can be found between June and September and feed exclusively from birch leaves (Betula sp.) Birch sawfly (Cimbex femoratus) sunning on leaves in a woodland ride, Lower Woods, Gloucestershire, UK, June. Life cycle (East of the Rockies) The antennae are black at the base and yellow-orange at the tip. They are widespread throughout Europe and Siberia. https://www.alamy.com/stock-photo-birch-sawfly-larvae-croesus-septentrionalis-on-a-leaf-16456074.html, Macro vertical view of a leafminer larva pocket, https://www.alamy.com/macro-vertical-view-of-a-leafminer-larva-pocket-image385054008.html, https://www.alamy.com/a-caterpillar-sawfly-broadfooted-birch-leaf-wasp-croesus-septentrionalis-on-plant-with-blue-background-and-copy-space-image358550815.html. We have tried spraying, and picking manually, but recently tried a vacuum cleaner, a shop-vac, with the creavace tool, and it sucked them all off from the branches with no problem! For many species the most useful way to determine whether a caterpillar is a sawfly is to count the legs. Although, on smaller caterpillars this can be difficult. Cimbex femoratus, the birch sawfly, is a species of sawflies in the family Cimbicidae. A sawfly is a primitive wasp-like insect. ), larvae of a Symphyta on a birch leaf, Austria, Tyrol, Fernpassgebiet, https://www.alamy.com/symphyta-craesus-spec-larvae-of-a-symphyta-on-a-birch-leaf-austria-tyrol-fernpassgebiet-image372515885.html, Dusky birch sawfly, Craesus latitarsus, larvae on the leaves on a young alder tree, Alnus glutinosus, Berkshire, September, https://www.alamy.com/stock-photo-dusky-birch-sawfly-craesus-latitarsus-larvae-on-the-leaves-on-a-young-74298956.html, https://www.alamy.com/stock-photo-birch-sawfly-cimbex-femoratus-10884809.html, https://www.alamy.com/ichneumon-wasp-emerging-from-host-pupa-image245367526.html, https://www.alamy.com/stock-photo-larva-of-birch-sawfly-cimbex-femoratus-175377007.html, https://www.alamy.com/ichneumon-wasp-emerging-from-host-pupa-image245367466.html, Birch Sawfly (Cimbex femoratus), resting caterpillar, https://www.alamy.com/stock-photo-birch-sawfly-cimbex-femoratus-resting-caterpillar-12344199.html, https://www.alamy.com/caterpillar-sawfly-broadfooted-birch-leaf-wasp-croesus-septentrionalis-runs-on-a-green-leaf-with-copy-space-image260297974.html, Birch Sawfly (Argidae, Arge pectoralis (Leach)) (36590254602), https://www.alamy.com/stock-photo-birch-sawfly-argidae-arge-pectoralis-leach-36590254602-170358479.html, Sawfly larvae on river birch - Betula nigra - trunk, https://www.alamy.com/sawfly-larvae-on-river-birch-betula-nigra-trunk-image8023148.html, Dusky Birch Sawfly croesus latitarsus larvae feeding on silver birch leaf potton bedfordshire, https://www.alamy.com/dusky-birch-sawfly-croesus-latitarsus-larvae-feeding-on-silver-birch-image1985815.html, https://www.alamy.com/a-pretty-birch-sawfly-caterpillar-cimbex-femoratus-feeding-on-silver-birch-in-woodland-image381508554.html, https://www.alamy.com/stock-photo-sawfly-larvae-craesus-latipes-29368028.html. 3 Infestation status of the Larch Sawfly in Eastern Canada. The head is large, with large and strong mandibles. HIGHLY RECOMMENDED as opposed to plucking them off manually.

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