Gardeners encounter a variety of pests while tending to their beds. One of the most common finds are grubs in vegetable garden beds. They are the little larva of different kinds of beetles. Grubs resemble a small, white worm or caterpillar, close to ¾ to 1 ½ inches long. Some are white, but others have gray bodies. You can commonly find grub on your lawn, but they can cause trouble in your vegetable garden.