The horrible little allium leaf miner flies are still active through November, so it is a good idea to protect crops like leeks and autumn planted garlic and onions with fine mesh, as recommended by the RHS.

Cover leeks, onions, etc. in November.
The horrible little allium leaf miner flies are still active through November, so it is a good idea to protect crops like leeks and autumn planted garlic and onions with fine mesh, as recommended by the RHS.