greenbug

/ɡriːnbʌɡ/
noun
  1. A small green insect that feeds on plants, especially a type of aphid that damages crops like wheat and barley.
    • Gardeners often check the underside of leaves for greenbug infestations.
    • The farmer sprayed the field to kill the greenbug before it destroyed the wheat.
    • A single greenbug can produce many offspring, quickly covering a plant.