The leek moth is 5 mm to 7 mm long. It lays eggs on alliums (e.g., garlic, leeks, and onions). The larvae hatch, chew their way into the plant, and eat as much as possible. Then they spin a cocoon and, eventually, emerge as a new leek moth. The cycle repeats two to four times a season. Photo by gailhampshire from Cradley, Malvern, U.K (Leek Moth?. Acrolepiopsis assectella) [CC BY 2.0 (https://creativecommons.org/licenses/by/2.0)], via Wikimedia Commons