Naturally occurring bacterium will kill Japanese Beetle June Beetle and other lawn grubs. Milky spore powder is a one-time application using the Lawn and Garden Dispenser (using Orgill item no. 908-8766) or teaspoon. Once applied Milky Spore is a natural bacteria that eats the grub from the inside out. Once in the soil it will remain dormant. Harmless to humans pets birds fish and beneficial insects.Once infected the grubs die and decay releasing billions of new spores into the soil.As for using a Natural Guard product for grub control that may not be possible as none of them are labeled for grubs. We do carry Milky Spore which is labeled for grubs and is one of the lower risk products.