They look big for onion root maggots but this link might help: http://lawnandgarden.unl.edu/scripts/com_disease_insect.cgi?ID=1011285760

Are they possibly wireworms? Try the link below and see if they look like the right suspect.

Here is a link that might be useful: Wireworm info

Makalu,

Thank you, I believe wireworms are the culprit. Now that I think about, I believe I have seen these previously in the soil elsewhere. It seems there is not a whole lot I can do about it. Perhaps I can trap them somehow till the onions get bigger. I have some carrots sprouting now not too far from the onions. I hope they don't get dessimated as well. I read that wireworms like carrots as well.

John

I think I may give beneficial nematodes a try. They are a bit pricey though.

I am ordering some Nematodes from the site I have linked here. They are close and have the cheapest price for my small garden.

We'll see what happens.

John

Here is a link that might be useful: March Biological