i have just returned from digging some leeks at my allotment to find they are all infested with a small reddy brown weevil type. The bugs are all aligned along the plant and are in the white flesh below soil level. The only pests I can find are the onion fly and onion leaf miner, but the leaves are fine and it doesn't look like the description of onion fly larvae. They are all sat individually in the plant and each has left a short trail straight up and down in the flesh which is looking pinky brown in colour. In 25 years growing leeks I have never seen this before. Any thoughts please?