Wooly Aphis on Alnus
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Woolly aphis is a plant lice. Eggs are attached to twigs during the winter. In the spring soft-bodied, wingless female aphid appear and give birth to young aphids. They suck the juices from leaves or twigs.
Source
L. H. Bailey Standard Cyclopedia of Horticulture (New York, New York: The MacMillan Company, 1917) volume 1, page 367
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