Plant-eating insects cause enormous damage to crops; any part of a plant is subject to attack by either the adult or the larva of some insect. Among the well-known plant pests are the locust, armyworm, aphid, corn borer, coddling moth, tent caterpillar, Japanese beetle, gypsy moth, bagworm, and scale insect. Insect carriers of human diseases include the mosquito, housefly, tsetse fly, and flea.
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