The Leek moth (Acrolepiopsis assectella) also known as the onion leaf miner is an invasive species in North America that attacks leeks and related Allium species.
The female lays eggs on the leaves of the host plant. The larvae are light yellow-green in color with a brownish head. The first instar larvae form leaf mines, shaped like a corridor which then turns into a blotch and can be with or without frass.
This leaf mining can occur in the tubular leaves or in the stem. In the case of onions and shallots, the larvae mine into the bulb. In North America, where the moth is an invasive species and has few known natural predators, the species threatens the production and biodiversity of Allium, and it has the potential to destroy entire crops.
The leek moth may leave behind sticky frass, contaminating the plants and causing marketable loss.
There are natural enemies of the leek moth.
For more information contact your local BioBee field agent.