Corn Gluten Meal is for fertilizing & as a pre-emergent. Horticultural Cornmeal is what you are probably referring to. It helps with fungus issues. Both products can be applied with a whirly spreader. The corn gluten meal is pretty messy since it is a fine powder. See the links below for additional info.
Keep searching this site & discussion board since something is causing your problem. Maybe others can also pitch in and provide help.