Come mid-summer, watch the skies for a gray moth. This moth will leave her eggs on the fruit and corn in your garden. The good thing is that these little worms are cannibals so there are less of them to damage to your crops. However, the bad thing is that just one worm can cause enough damage to ruin a corn cob. Most of the corn that is eaten is at the tip of the ear. If you process the corn for meal, the damaged end is usually cut off so it's not a big problem.