Hi ian, These are Sawfly Larvae and we found a photo on FlickR that looks identical that identified them as Lesser Willow Sawfly Larvae, Nematus pavidus. Photograph of Parasitic wasp (Braconidae) with ovipositor extended approaching caterpillar of Lesser Willow Sawfly (Nematus pavidus). Sawfly damage is caused by the larvae that feed on the plants in several different ways, depending on the species. Kim Taylor / Parasitic wasps (Braconidae) approaching caterpillar of Lesser willow sawfly (Nematus pavidus) to lay eggs on, Surrey, England, UK. The gall is commonly seen but the adult sawfly rarely so. Sawfly Damage. A Overwintering pupae hatch in April and lay eggs on the young leaves in rows … Lesser Willow Sawfly Larvae. Hosts: Willow and to a lesser extent poplar. Willow Sawfly, Nematus ventralis Appearance: Larvae are black or greenish black with large yellow spots along their sides. ( Willow, sawfly, lesser) Allantus cinctus ( Rose sawfly, curled) Nematus olfaciens: Blackcurrant Sawfly: Nematus ribesii: Gooseberry Sawfly: Endelomyia aethiops: Rose slug, rose sawfly: Pristiphora abietina (Gregarious spruce sawfly) Pristiphora erichsonii (Larch, sawfly, large) Pristiphora laricis The gall is generally pea-shaped, starting green but becoming red as it matures. 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 Some leave holes or notches in the … The most common North American species is the elm sawfly (Cimbex americana), a dark blue insect about 2.5 cm (1 inch) long. June. Damage: 1 . The larvae feed on elm and willow. A wasp can spend as much as one hour trying … Q Can you tell me more about gooseberry sawfly? In Europe the larvae of Clavellaria amerinae feed on willow and poplar. The braconids approach very stealthily in order to lay eggs on the caterpillars which thrash from side to side in an attempt to protect themselves. Related posts: ... and lesser gooseberry sawfly (N. leucotrochus). Solomon's-seal sawfly (Phymatocera aterrima). Pale green weevil (Polydrusus impressifrons) Spined soldier bug (Podisus maculiventris) Petiole galling aphid (Pemphigus populi-transversus) Viceroy butterfly egg (Limenitis archippus) Willow leaf sawfly damage is easily recognized by the fleshy galls that develop at the spot where the female injects her eggs into the leaves. Lesser willow sawfly (Nematus pavidus) larvae feeding on edge of leaf, Sussex, England, UK. I like This. We verified that ID on BioLib as well as on Naturespot UK. Ash Sawfly (Blackheaded and Brownheaded) Dogwood Sawfly Dusky Birch Sawfly Elm Sawfly Larch Sawfly Loblolly Pine Sawfly Mountain Ash Sawfly Oak Sawfly Pear Sawfly (also known as Pear Slug) Pine Sawfly (European, Introduced, Redheaded, and Virginia) Raspberry Sawfly Roseslug Sawfly White Pine Sawfly Willow Sawfly Yellowheaded Spruce Sawfly Pontania pedunculi is a sawfly that causes a gall on certain species of Willow: Salix capraea (Goat Willow), Salix cinerea (Grey Willow) and Salix aurita (Eared Willow). They have black heads and are 18 mm (3/4") when full grown. Many hundreds of different types of sawfly cause problems in the garden. September. 01594606 Kim Taylor / Parasitic wasp (Braconidae) with ovipositor extended approaching caterpillar of Lesser Willow Sawfly (Nematus pavidus). Lesser willow sawfly (Nematus pavidus) Leaf-folding sawfly larvae (Phyllocolpa sp.) 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