Pest Management

Wax Moths: Prevention, Damage Control, and Saving Your Comb

By Scout Theory · May 2026 · 10 min read

If you have kept bees for more than one season, you have met wax moths. Open a stored super you forgot about, and instead of beautiful drawn comb you find a tangled mess of webbing, black frass, and tunneled wax. The frames are ruined. The wax is destroyed. And buried in the wreckage are fat, pale larvae that have been feasting on your hard-earned comb for weeks.

Wax moths (greater wax moth, Galleria mellonella, and lesser wax moth, Achroia grisella) are not a sign of bad beekeeping. They are part of nature's cleanup crew — their ecological role is decomposing abandoned comb. The problem arises when they target stored equipment or weak colonies that cannot defend themselves.

Understanding the Enemy

Adult wax moths are small, nondescript gray or brown moths that fly at night. They slip into hives or storage areas after dark and lay eggs in cracks, crevices, and the edges of comb. A single female can lay 300–600 eggs in her 2-week lifespan.

The damage is done by the larvae, not the adults. Wax moth larvae tunnel through comb, eating beeswax, pollen, cocoon silk, and larval skins left behind by developing bees. As they tunnel, they leave silk webbing and dark frass (feces) behind. In severe infestations, the webbing can "trap" developing bee pupae in their cells, causing a condition called "bald brood" where bees chew through capping to free trapped sisters.

The larvae pupate in tough silk cocoons, often chewing into the wooden hive body to create a shallow groove for the cocoon. These grooves weaken boxes over time and are a telltale sign of past infestations.

In‑Hive Prevention: Keep Colonies Strong

A strong colony is the best defense. Healthy bees actively patrol their comb, remove moth eggs, and kill larvae they find. Wax moths rarely become a problem in a colony that covers all its frames with bees.

Wax moths become dangerous when colonies are weakened by varroa mites, queenlessness, disease, or simply having too many empty frames for the population to patrol. The number one prevention strategy is keeping your colonies strong and not giving them more space than they can defend.

Do not stack empty supers on weak colonies. If a colony only covers 6 frames, they do not need 3 supers of empty comb above them. Remove unused boxes and store them properly.

Remove dead-outs promptly. When a colony dies, the empty hive is an open invitation to wax moths. Pull the equipment within days, not weeks.

Storing Comb: The Critical Skill

Most wax moth damage happens in stored equipment, not in active hives. How you store your supers after extraction determines whether you will have drawn comb ready to use next spring — or a webbed disaster.

Method 1: Freezing. Freeze frames for 48 hours to kill all moth eggs, larvae, and pupae at every life stage. After freezing, store in sealed plastic bags or bins. This is the gold standard for hobbyists with a chest freezer.

Method 2: Light and air. Stack supers with spacers between them in a well-ventilated, well-lit area. Wax moths prefer dark, still environments. Bright light and airflow discourage adult moths from laying eggs. This method works but is not foolproof in warm climates where moth pressure is intense.

Method 3: Para-Moth (paradichlorobenzene). Mann Lake Para-Moth is a crystal fumigant designed specifically for stored beekeeping equipment. Stack 5 deeps (or 7 mediums or 9 shallows) on a flat surface, place 6 tablespoons of crystals on newspaper on the top frames, cover the stack, and the fumes kill moths and larvae. Air equipment for several days before returning it to bees. Never use regular mothballs (naphthalene) — they leave toxic residue that kills bees.

Method 4: Bt (Bacillus thuringiensis). Certan and Xen-Tari contain Bt aizawai, a biological control that kills wax moth larvae when they eat treated comb. Mix with water and spray on frames before storage. Bt is non-toxic to bees and breaks down over time. This is the most bee-friendly chemical approach.

DIY Wax Moth Trap

You can reduce moth populations around your apiary with a simple homemade trap. Take an empty 2-liter soda bottle, cut a 1-inch hole near the top, and fill it with 1 cup water, 1 cup sugar, ½ cup white vinegar, and a banana peel. Cap the bottle and hang it near (but not on) your hives. The fermenting mixture attracts adult moths, which enter the hole and cannot escape. Replace the mixture every 2–3 weeks.

Salvaging Damaged Comb

If moths have gotten into your stored frames, assess the damage. Frames with light webbing and minimal tunneling can be salvaged — freeze for 48 hours, scrape off the webbing with a hive tool, and let your bees clean the rest. Bees are remarkably good at repairing minor damage.

Frames that are heavily tunneled, with structural damage to the comb, are beyond saving. Scrape the wax into a collection bag for rendering, clean the frame, and install fresh foundation.