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The balsam woolly adelgid (Adelges piceae) is small wingless insect that infests and kills firs.In their native Europe they are a minor parasite on silver fir and Sicilian fir, but they have become a threat especially to balsam fir and Fraser fir after they were introduced to the United States around the beginning of the 20th century.
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
The insects appear as white, woolly spots on the tree and are fatal to the fir if left untreated. The woolly adelgid was native to central Europe where it affected the silver fir; it was introduced to the United States, where it has no known native predators, before 1900. [1] Balsam twig aphids (Mindarus abietnus) are another type of tree pest ...
The Fraser fir tree ... Balsam woolly adelgid is an introduced pest that has become a major threat to Fraser fir trees in the wild. An initial infestation causes swelling and dieback of buds and ...
By midsummer (August to September), the galls begin to dry out, the chambers open and winged forms of the adelgids emerge. These winged adult females have dark red-brown colour, with a heavily sclerotized thorax. 3, 4 These leave the original tree and most migrate to Douglas-fir trees. The abandoned galls continue to dry out and harden as the ...
Spokesperson Hélène Bonte said: "To avoid issues with emerging woolly aphids, Christmas trees are often treated intensively.” ... “Spruce and pine trees that have been treated with, for ...
Adelgids only lay eggs, and never give birth to live nymphs as aphids do. Adelgids are covered with dense woolly wax. A complete adelgid life cycle lasts two years. [6] Adelgid nymphs are known as sistentes, and the overwintering sistentes are called neosistens. [7] Rain can kill adelgids by dislodging eggs and sistentes from trees. [8]
The adults of Eriosoma lanigerum are small to medium-sized aphids, [4] up to 2mm long, and have an elliptical shape, are reddish brown to purple in colour but the colour is normally hidden by the white cotton-like secretion from the specialised glands in the aphid's abdomen which gives it the common name of woolly apple aphid.
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