Author(s) K. A. Delahaut.
Onion maggots (Hylemya antiqua) are tiny maggots that feed below ground on onion bulbs, making tunnels in the bulbs and potentially allowing disease organisms to enter. These maggots are often the most serious pest of onions, especially where continuous production is practiced.
Onion maggots are highly host-specific to plants in the onion family, including onions, leeks, shallots, garlic, and chives. Find out how to identify, prevent, and control this pest in your home garden by reading this handy fact sheet (2 pages; 2001).