AzaSol is the first water soluble powdered azadirachtin product developed for superior biologically-based insect control. AzaSol is a high-potency powder that's water soluble, solvent-free, and shelf stable for more than two years. It's intended for use indoors and out, and can be applied via soil drench, injection or spray. Studies show azadirachtin, derived from neem plants, to be a highly effective broad spectrum biological insect control and repellent that provides protection from insects ranging from annual bluegrass weevils to whiteflies. 6 oz per 50 gal. of water.