Chemical control of the willow redgall sawfly is rarely required due to parasites and predators that attack the sawfly and as the insect causes minimal permanent damage to the host. The willow redgall sawfly has two generations a year, with the first generation adults emerging in late May or early June. Criticism of products or equipment not listed is neither implied nor intended. Adult Willow Redgall Sawflies are small - approximately 3.5-5 mm long. Member Category Descriptions When full grown, the larvae drop to the ground and form cocoons in the topsoil. Image 4554074 is of willow redgall sawfly (Pontania promixa ) damage on willow. Huge collection, amazing choice, 100+ million high quality, affordable RF and RM images. Menu. They may then transform to the pupal stage or remain in the gall; soil moisture has been shown to affect this stage in related species. Each adult can produce 2 to 35 eggs. The adult sawfly forms the galls on the leaves by injecting a fluid into the leaf along with the egg. They are shiny, black and wasp-like. Also many other insects may also utilize the galls in their development and incidently kill the developing willow redgall sawfly larvae. 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. Typically there are probably two generations per year under Colorado conditions. These conspicuous red galls, like a short string of small red jelly beans in the leaf, are caused by a small sawfly. Willow sawfly; Pear sawfly (AKA pear slug) Scarlet oak sawfly; Adults will emerge during the spring and summer after the winter and will feed less on leaf material and more on pollen, nectar, and other bugs. the nodules with the nitrogen-fixing rhizobia bacteria that form on the roots of legumes. Although the willow redgall sawfly causes minimal permanent damage, the galls are extremely unsightly especially on ornamental plantings. Each adult can produce 2 to 35 eggs. These galls can be highly conspicuous but do not appear to seriously affect the health of the tree. the nodules with the nitrogen-fixing rhizobia bacteria that form on the roots of legumes. Find the perfect willow sawfly stock photo. Occasionally, similar fleshy leaf galls are produced on currant or gooseberry by an unknown species. Details Written by Kevin R. Lee Kevin R. Lee Published: 09 April 2018 09 April 2018. The galls measure approximately 8 mm long, 6 mm wide by 6 mm deep. The willow gall sawfly, Pontania proxima (Lepeletier, 1823), causes oval galls on willow leaves in which the larvae live. Download this stock image: Willow Redgall Sawfly - F0Y9PJ from Alamy's library of millions of high resolution stock photos, illustrations and vectors. They are shiny, black and wasp-like. The larvae feed and develop within the galls for approximately five weeks. The willow redgall sawfly has two generations a year, with the first generation adults emerging in late May or early June. At this time the female wasps also lay down chemicals that initiate formation of gall tissue. The galls appear red on the upper surface and are yellowish-green on the underside. When full grown, they drop to the ground and spin a cocoon. The willow redgall sawfly produces a pronounced, reddish bean-shaped swelling on the leaves of willow. No need to register, buy now! The developing larvae feed on the soft tissues within the gall, later moving into firmer tissues to feed but remaining within the gall. Adults emerge in spring and lay eggs in young, expanding leaves during late spring and early summer. Each adult can produce 2 to 35 eggs. The willow redgall sawfly has two generations a year, with the first generation adults emerging in late May or early June.