 Date: 2009-09-24 13:31:50Flora Hemlock woolly adelgid Parasites Biology Tsuga canadensis HWA Tsuga caroliniana Adelges Black-throated Green Warbler Flora of the United States Hemiptera Tsuga | |  Individual HWA - www.forestryimages.org Control - continued The second method involves spraying the infested hemlocks with insecticidal soaps or horticultural oils. According to the N.C. State University Cooperative
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