Sometimes fish just prefer a wax worm instead of the ole faithful night crawler.

Last winter I caught more trout with a wax worm than with any other worm. I was using artificial wax worms and having a variety of fishing bait worms in your tackle box will pay off when the fish are being picky. The great thing about artificial fishing worms are that they can be stored without risk of dying or going bad and come in a variety of sizes, shapes and colors.
I personally had a lot of success with the yellow wax worms. Other angles I fish with keep a variety of colors on hand as the color makes a difference depending on water color and fish preference at that time. Worms are great fishing bait when fishing for the average size of a certain species but if you want bigger fish, you will need to fish with prey fish type bait. Larger predatory fish will primarily focus on prey fish as their meal source than on insects and worms. Using a larger worm size can bring in good size fish as the temptation is too difficult for larger fish to pass up on.
Night crawlers, red worms, and wax worms are the popular types of fishing baits and each have their unique characteristics that attract different species and sizes of fish. Wax worms are great at enticing a strike from crappies, sunfish, trout, perch, walleye, pike and other gamefish species.
Wax worms are technically not worms but caterpillar larvae and are often referred to as waxies. Anglers can buy wax worms (meal worms) in the same location as they would buy night crawlers or red worms. I usually get my live worms from Wal Mart but most outdoor sportsman stores would sale them as well.
Fishing is fishing and if you can’t get the big one you’re after, a fish is a fish. Keep a supply of wax worms in the ready and have fun.