Other Free Encyclopedias » 21st Century Webster's Family Encyclopedia » 21st Century Webster's Family Encyclopedia - Anderson, Elizabeth Garrett to Arctic tern



Aphid, destructive sap-feeding insect of the aphid family, also known as greenfly or plant louse. Because of the damage caused by their piercing of plant tissue and because many of the 4,000 species carry viruses, aphids are one of the world's greatest crop pests. They are an important food source for ants and other insects.

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