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yew 1. 1. any of several evergreen trees or shrubs of the genus Taxus, of the family Taxaceae, having needlelike foliage and seeds enclosed in a fleshy aril. 2. the fine-grained, elastic wood of any of these trees. 3. an archer's bow made of this wood.
Green, or green with a slight yellow tint, is the yew's color of choice. While some yews (Taxus spp.) have greenish-yellow foliage, a straight yellow is not in the color palette for these evergreen shrubs unless something is wrong.he females look like tiny dots, while the males have a pair of wings. They eat the foliage and bark of yews, causing a yellowish-brown color to appear. Mealybugs are around 1/8 inch long and feed on the sap of yew shrubs, causing sap levels to drop, which leads to a yellow discoloration of the foliage.