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onion fly

British  

noun

  1. a small grey dipterous insect, Delia antiqua, that is a serious pest of onions. The larvae destroy the bulbs

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Example Sentences

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The onion fly may, in part, at least, be abated by the use of equal parts of wood ashes and land plaster dusted very thoroughly on the young plants.

From Farm Gardening with Hints on Cheap Manuring Quick Cash Crops and How to Grow Them by Anonymous

The chief insect enemies are onion maggots, the larvae of the onion fly.

From The Home Acre by Roe, Edward Payson