I would turn it over before the heavy frost put Manure on it let it over winter then howe it down -- Try to grow
cauliflowers as they love well manured soil ot potatoes -- Nothing ventured nothing gained I say -Ken

I wouldn't worry about the insects the ones that eat rotting wood don't eat vegetables. As Ken says dig it over now I wouldn't worry to much about the manure if you don't have just add compost next spring.

As MG said, insects, mainly beetles that live in wood don't normally make their home in soil and eat vegetation. They will probably disappear to a more favourable environment once the wood is removed.

Thanks for your responses. I will certainly take your advice and hopefully reap the rewards next year.