Definition of black fly in English:

black fly

Syllabification: black fly

noun (plural black flies)

1A small black fly, the female of which sucks blood and can transmit a number of serious human and animal diseases. Large swarms sometimes cause distress to livestock and humans.
  • Family Simuliidae: Simulium and other genera
More example sentences
  • Similarly, the device mimics a human by emitting a plume of carbon dioxide, heat and moisture, and an attractant, octenol, which targets mosquitoes, biting midges, black flies and sandflies.
  • Other blood feeding insects or mites that may occasionally be pests of poultry include: chigger mites, biting midges, and black flies (turkey gnats).
  • In fact, in their effort to discourage the world's mosquitoes, blackflies, sand flies and ticks, consumers spend an estimated $200 million annually on sprays, liquids, lotions, candles and other anti-insect concoctions.
2A black or dark green aphid that is a common pest of crops and gardens.
  • Several species in the family Aphididae, in particular Aphis fabae
More example sentences
  • Hover flies and lace wings control aphids and blackfly.
  • Most common are greenfly on roses and blackfly on nasturtiums and broad beans, but dozens of their relations also attack other plants.
  • One or two other insidious pests have crept almost unnoticed into my garden this month including blackfly, which have infested the tall flowering stems of the cardoons.

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