I need some help identifying a larvae..

Question

White larvae with brown heads, have eaten roots and bulb of my onions that I planted last month.
The green shoots had turned yellow so I thought I would lift some to see what was going on, this is when I found the larvae.

I then noticed some of the early tomato plants near to them had wilted so lifted them to find they had no roots and larvae around them.

I am a bit confused to which infestation I have, onion fly, vine weevil or something else??
Do vine weevil likes onions?
Please can you advise me as I really don`t know.

Many thanks

P.s. sorry I haven`t taken any photo`s of them.

Answer 1

Possibly root weevil larvae. Here's an article that should help:

https://www.gardeningknowhow.com/plant-problems/pests/insects/controlling-root-weevil.htm