Citricidex, also known as Citricidal, is grapefruit extract. It has a mind-boggling array of applications, from mouth wash to dish cleaner. Citricidex can also be used to kill mold. Experienced growers know that wheatgrass is incredibly prone to mold growth. A few spores likely covered the seed you purchased. As the grass grows, the base of the stalks often become covered in fuzz. Since Citridex is a natural product, it is safe to liberally spray on your wheatgrass to keep the mold at bay.
Add 5 to 10 drops of Citridex to a plastic spray bottle filled with 16 oz. of water.
Spray the base of the wheatgrass and the soil wherever you see mold growth.
Respray the wheatgrass as needed whenever the mold crops up again. Mold should no be a chronic problem in your wheatgrass shoots. If it is, try reducing the frequency of your watering. You can also place a fan near the shoots or place them near an open window to increase air circulation across the patch.