The pest status of woolly apple aphid in the Pacific Northwest has varied over time. The egg stage is not known to occur in Pacific Northwest orchards. 859-257-4772, Students / Use M111 or M106 if woolly apple aphid is a serious problem. Sandanayaka, W. R. M., and V. G. M. Bus. It is important to scout your own trees to determine when and if a treatment is needed. Overwintering colonies are usually found in old pruning scars, although some survival has been recorded on shoot galls from the previous year’s infestation. No. Patch, E. M. 1912. Preferred feeding sites during the summer are leaf axils on terminal shoots. They have been known High populations of woolly apple aphid can create sticky and unpleasant working conditions for harvest crews. Protect natural parasitoids. Egg-laying wounds by the periodical cicada are ideal sites for infestation. Winged adults (alates) are normally the form that would migrate back to the overwintering host (elm) in the fall. Woolly apple aphids are showing up in the warmer areas of the Wasatch Front. A colony appears as a cottony mass generally clustered in wounds and pruning scars on the trunk and branches of the tree. The cornicles are circular, and only slightly elevated from the surface of the abdomen. To aware apple growers of the state, Dr Rakesh Kumar, Department of Entomology, Dr YS Parmar University of Horticulture & Forestry, Nauni has come up with a detail suggestion of controlling the Woolly Apple Aphid. Organophosphates have been replaced by other groups of pesticides (including IGRs, neonicotinoids, and other novel modes of action), which have little or no toxicity to woolly apple aphid, but may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. The waxy filaments begin to form after the aphid settles to feed. The adult is reddish-brown to purple. Attacks apple and pear. Journal of the American Society for Horticultural Science, 106(1):26-30. In severe winters above-ground colonies may be killed. I have sprayed with a … PREVENTING WOOLLY APHIDS IN APPLE TREES There are two main actions you can take to reduce the likelihood of a woolly aphid attack. The resistance is based on Malus robusta apple rootstock, and apparently confers a higher level of resistance than the older Malling-Merton series. The aphid’s body is covered with waxy, cotton like substance. by Elizabeth H. Beers, Stanley C. Hoyt, and Michael J. Willett,Â originally published 1993; revised March 2010 E. Beers; and June 2019 Robert J. Orpet. Hortic. Larger nymphs and adults have long … Store pesticides in their original containers and keep them out of the reach of children, pets, and livestock. Woolly Aphids, like all other aphids, eat by sucking the sap off the plant they live on; however, while other aphids take it by inserting their long, needle-like mouth into the leaves of plants, woolly aphids have decided to go the hard way and do it stems. Trees can have above-ground infestations of woolly apple aphid but no root infestations. 3. The presence of colonies on the current year’s extension growth is the critical factor an… Infested nursery stock is also a source for spreading aphids. In theÂ fall, winged individuals are produced which fly to search for elms on which to lay overwintering eggs, while some wingless forms may remain on both above and below ground parts of the apple tree throughout the winter. They are brown or greyish-purple in colour, although this is usually masked by the wax. It is most commonly found on crabapple feeding at the base of new shoots. WAA have a complex life cycle that can involve overwintering either on apple or elm. When examining colonies, blow hard on the branch to remove the waxy filaments to reveal live aphids. Ph.D. Thesis, Washington State University, Pullman. Woolly apple aphid www.hortipendium.de. Galls caused by feeding of aphids are re-infection sites for the causal fungus of perennial canker, Cryptosporiopsis perennans. The selection of an apple stock line, Siberian crabapple Jin 67, immune to the woolly apple aphid. 1981. Swollen galls also form on roots; galls increase in size from year to year and are sites where fungi can attack. 2003. Care must be taken to anticipate a fall outbreak and ensure that the preharvest interval of the pesticide is observed. These galls are more sensitive to low temperatures than normal bark tissue and rupture at about 0ÂºF or colder, providing an entry site for the fungus, continuing the perennial nature of the canker. Woolly aphids are easily recognized by the mass of white woolly wax that they produce. Acta Hortic. However, woolly aphids, which are green or blue, also appear fuzzy due to the white, waxy material that covers their body. Treatments for woolly apple aphid are recommended when 10% of the pruning scars are infested with live colonies. Roots of infested trees have large, abnormal swellings. The woolly apple aphid, Eriosoma Lanigerum, is a pest in many apple-growing countries. These in turn mate and the females lay eggs which overwinter on elm. Woolly apple aphid eggs hatch in the spring creating a generation of wingless, parthenogenic viviparous females only on American elm trees. The nodules can split and develop into cankers. Description: Adult aphids are approximately 1.5 mm long and … Therefore colonies of this aphid appear as cotton and at first glance can be confused with a fungal disease. If we smash the aphids, a blood colored liquid comes out (this is how it gets it local name of "blood aphid." The root systems of nursery stock can be damaged, and severe root infestations can stunt or kill young trees. Trade (brand) names are provided for your reference only. 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