Eriosoma ulmi (Elm-currant aphid): identification, images.
Introduction. Woolly apple aphid (WAA), Eriosoma lanigerum (Hausmann) (Hemiptera: Aphididae), is a worldwide pest of apple Malus domestica (Borkhausen). It is a native of North America, where the American elm Ulmus americana (Linnaeus) (Urticales: Ulmaceae) is the primary host and apple the secondary one; in the absence of the primary host it develops on apple throughout the year.
Eriosoma lanigerum (Hausmann, 1802) woolly apple aphid, American blight on Ulmus, primary host plant gall. In the older literature it was assumed that this species also, or perhaps originally, occurs in North America and there passes a spring generation on elm. Currently this vision is considered uncertain. In most parts of Europe the species lives permanently on its secondary host. host.
Predation by the aphidophagous syrphid fly Heringia calcarata (Loew) on woolly apple aphid, Eriosoma lanigerum (Hausmann), was studied in the laboratory and in Virginia apple orchards. Feeding studies compared the prey suitability of three temporally sympatric aphid pests of apple: spirea aphid, Aphis spiraecola Patch; rosy apple aphid, Dysaphis plantaginea (Passerini); and woolly apple aphid.
The role of the predatory coccinellid Exochomus quadripustulatus in controlling the aphid Eriosoma lanigerum (especially in springtime) was investigated in an experimental orchard in the Netherlands in 1993-94. In ecological conditions in the Netherlands, the parasitoid Aphelinus mali alone cannot control E. lanigerum. Exochomus quadripustulatus is the commonest and most widespread coccinellid.
In organic apple growing the woolly apple aphid (Eriosoma lanigerum) is still an unsolved problem. Various approaches to use beneficial insects were not really effective. Only winter treatments with mineral oils showed partial and fluctuating success. In 2006 and 2007 field trials were carried out to evaluate the efficacy of winter treatments to control woolly apple aphids. The efficacy of.
The woolly apple aphid, Eriosoma lanigerum is a widespread pest of fruit trees, feeding principally on apple, but also, pears, hawthorn, ash, alders, elms and oaks. Gall making species include Melaphis rhois and Pemphigus spp. Further minor damage can be caused by the honeydew that woolly aphids secrete, which is difficult to remove.
During summer the parasitoid Aphelinus mali may certainly reduce the infestation of woolly apple aphid (Eriosoma lanigerum), but studies on the single. Asante, S.K., and W. Danthanaryana. Development of Aphelinus mali, an endoparasitoid of woolly apple aphid, Eriosoma lanigerum. Bio-pesticide properties for Aphelinus mali, including approvals, environmental fate, eco-toxicity and human health.