These insects attack a wide array of plants causing a loss in vigor, leaf yellowing defoliation, and in some instances severe distortion of the foliage. As aphids feed on the plant, they excrete excess sap called honeydew. In cases such as Tuliptree aphid infestations, the honeydew drips out of the tree onto surfaces below the tree. A fungus called sooty mold can then grow on the sugars contained in the honeydew, causing blackening and serious staining. Aphids are generally easy to control with a wide array of materials and techniques.
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