Applying BT (Bacillus thuringiensis) to stored combs is a biological control method to prevent wax moth larvae from damaging beeswax. BT is a naturally occurring bacterium that produces a toxin specific to moth and butterfly larvae, including wax moths. BT products, available as sprays or powders, are applied to stored combs as a preventative measure. BT is safe for bees, honey, and humans when used as directed. It is effective in preventing wax moth larvae from establishing in stored equipment, offering a less toxic alternative to chemical fumigants. BT needs to be reapplied annually for continued protection.