Chemical usage depends greatly on the farm (as I'm sure you know), but pesticide and herbicide use are standard practice for most commercial crop growers in my area at least. One should know the history of the land before collecting anything from it (and have permission of course if it's not your land!).
I think "Dew Worm" is a Canadian term for Lumbricus terrrestris, which is the typical worm found in bait shops and get called "Nightcrawlers" south of our border. See Identifying Earthworms and follow the link to the taxonomic key if you want help in identifying worms. I don't think it really matters the type of earthworm you use to feed, just make sure the bait shop hasn't done anything funny to the worms like dye them to be more attractive to fish.
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