These galls are more sensitive to low temperatures than normal bark tissue and rupture at about 0ºF or colder, providing an entry site for the fungus, continuing the perennial nature of the canker. Galls, or swollen enlargements, form on the plant where aphid colonies feed on twigs or roots. Management. Woolly apple aphid Eriosoma lanigerum Hausmann ecology and its relationship with climatic variables and natural enemies in Mediterranean areas - Volume 105 Issue 1 - Jaume Lordan, Simó Alegre, Ferran Gatius, M. José Sarasúa, Georgina Alins Generally, monitoring should begin in midsummer or perhaps earlier if the winter was mild. It can occasionally also be found in pear, quince and a few other woody Rosaceae. Eriosoma lanigerum, the woolly apple aphid, woolly aphid or American blight, is an aphid in the superfamily Aphidoidea in the order Hemiptera. The selection of an apple stock line, Siberian crabapple Jin 67, immune to the woolly apple aphid. Control of these aphids is very difficult when they attack the roots. Damage: Woolly aphid infestations cause galls to form. The original primary (or overwintering) host of the woolly apple aphid is American elm. Besides apples, other hosts include pear, hawthorn, mountain ash and elm. This characteristic makes this aphid species easy to distinguish from other aphid species occurring on apple. The waxy filaments begin to form after the aphid settles to feed. There is a persistent speculation that the winged forms may form part of the dispersal mechanism to other apple trees, but the meager evidence on this subject indicates that egg production on apple is rare, and the eggs fail to hatch. The actual color, however, is usually concealed beneath a white, cotton-like substance secreted from the aphid’s abdomen. Woolly apple aphid definition is - a cosmopolitan dull reddish woolly aphid (Eriosoma lanigerum) that is primarily a bark feeder attacking both aerial parts and roots of apple … An effective pesticide can be applied at any time during the season when populations increase. Woolly Apple Aphid Aphid colonies are growing; treat early for best control When monitoring for woolly apple aphid, first check the edges of old pruning cuts. Rootstocks appearing more susceptible to woolly apple aphid infestation include B9, M9, M26 and the P series.Â. During the era predominated by organophosphate use, it was not considered a serious pest, or at least one that was easily controlled. Preferred feeding sites during the summer are leaf axils on terminal shoots. It is a true bug and sucks sap from plants. The influence of temperature and natural enemies on population development of woolly apple aphid, Eriosoma lanigerum (Hausmann). YOU ARE REQUIRED BY LAW TO FOLLOW THE LABEL. Excerpt from the WSU Crop Protection Guide. Organophosphates have been replaced by other groups of pesticides (including IGRs, neonicotinoids, and other novel modes of action), which have little or no toxicity to woolly apple aphid, but may be equally toxic to its natural enemies. Winged adults (alates) are normally the form that would migrate back to the overwintering host (elm) in the fall. Figure 3. Galls caused by feeding of aphids are re-infection sites for the causal fungus of perennial canker, Cryptosporiopsis perennans. It is now distributed throughout the apple growing regions of the world where its importance as a pest varies. Figure 2. The woolly apple aphid. This wax mass gives the insect its characteristic woolly appearance. The woolly aphid, Eriosoma lanigerum, is a serious worldwide apple pest. The adults are winged and move to new locations where they lay egg masses. WAA have a complex life cycle that can involve overwintering either on apple or elm. In areas where this species of elm occurs, elm is the overwintering host, and apple is one of several summer (or alternate) hosts. WA 38 First Commercial Season Storage & Packing Observations, WA 38 Optimization of Light Interception…, Pear Psylla Management using Reflective Plastic Mulch, Pear Psylla Insecticide Bioassay – Egg Mortality, Pear Psylla Management – Postharvest Sprays, Pear Psylla – Summer Generations Overview and Management, Management of Little Cherry & X-disease for Backyard Producers. Some rootstocks in a newer series developed by the Geneva rootstock breeding program are resistant to woolly apple aphid (e.g., G.41, G.213, G214, G.22, G.202, G.969, G.210, and G.890). There are four nymphal instars, averaging 0.64, 0.67, 1.2, and 1.3 mm in length. 5:27. It has been stated that interrupting the movement of crawlers from the root colonies to the aerial parts of the tree should prevent the formation of aerial colonies, but preliminary research has shown that this is not the case, at least in small plots; either overwintering survival on aerial portion of the tree, or reinfestation from nearby trees may be responsible. The wax and the honeydew are bothersome to pickers when it brushes off the tree and onto clothing of pickers.Â. Treatments for woolly apple aphid are recommended when 10% of the pruning scars are infested with live colonies. 2. DOI: 10.1603/EN09280. Ph.D. Thesis, Washington State University, Pullman. Woolly aphid For the past three years, my 14 year-old pyracantha, growing against the house wall, has become increasingly infested with woolly aphids. Attacks apple and pear. 2003. The latter is considered an important predator of woolly apple aphid in Washington and worldwide. 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