Closeup of aphids on the underside of a green lettuce leaf. - Smith Collection/gado/Getty Images Of the 5000 species of aphids in the world, about 1350 appear in the U.S. They average about 1/8 inch ...
Those cottony clusters are actually pests. If your shrubs have distorted, yellowing, or curling leaves or their growth seems stunted, take a close look. Woolly aphids may be to blame. These insects ...