Wax moths change dramatically from one life stage to the next, shifting from barely visible white eggs to plump, worm-like larvae, then compact pupae inside silk cocoons, and finally broad-winged adult moths with muted gray or brown coloring. Beekeepers encounter these insects primarily as larvae tunneling through comb, but learning to recognize every stage makes it easier to spot an infestation early. The two species that matter most, the greater wax moth (Galleria mellonella) and the lesser wax moth (Achroia grisella), look noticeably different from each other at every point in their development.
Eggs
Greater wax moth eggs are tiny, roughly the size of a pinhead, and nearly spherical with a slightly flattened side where they attach to a surface. When freshly laid they are pearly white or off-white, almost translucent, which makes them easy to overlook against light-colored beeswax. A female greater wax moth can deposit several hundred eggs in a single night, pressing them into crevices, cracks in hive woodwork, and gaps between frames where they are shielded from grooming bees. Over the next few days the eggs gradually darken in tone, taking on a faint yellowish or pinkish tinge as the embryo develops inside.
Lesser wax moth eggs follow a similar trajectory. They start near white to creamy in color and darken over time. By the third day a reddish circle becomes visible behind the egg shell, marking the developing larva inside, and hatching typically occurs within three to four days after laying.1Journal of Entomology. Observations on the Biology and Larval Instars Discrimination of Wax Moth Achroia grisella F. (Pyralidae: Lepidoptera) Greater wax moth eggs take a bit longer, usually hatching in five to eight days depending on temperature and humidity. In both species, the eggs are small enough and well-hidden enough that most beekeepers never see them directly. What they notice instead is the first evidence of tiny larvae and the silk trails those larvae leave behind.
Larvae
This is the stage most beekeepers know all too well, because larvae are the ones doing the damage. A freshly hatched greater wax moth larva is minuscule, only about a millimeter long, pale white, and nearly translucent. It has a dark brown or black head capsule that stands out sharply against its whitish body, which is one of the quickest ways to confirm you are looking at a wax moth larva rather than a small hive beetle larva or other pest. Even at this earliest stage the larva begins spinning silk and moving toward comb.
As the larva feeds and grows through successive molts, its body becomes creamier and more opaque. Mid-stage larvae are off-white to light gray with visible segmentation along the body, a row of small prolegs on the underside, and that persistent dark head. Fully grown greater wax moth larvae reach about 25 to 30 millimeters long, roughly an inch, and are noticeably plump. At this final size the body color can range from dirty white to a grayish-tan, sometimes with a faint pinkish or yellowish undertone depending on what they have been eating. Larvae that have consumed large amounts of dark brood comb tend to look dingier and darker than those feeding primarily on lighter wax.
One of the most distinctive features of wax moth larvae at any size is the silk webbing they trail behind them. As larvae burrow through comb, they spin a protective silk tunnel. In an active infestation, sheets of tough, matted webbing cover the comb surface and fill the spaces between frames. The larvae burrow into the edges of unsealed cells containing pollen, brood, and honey, tunneling through to the midrib of the comb and leaving behind dense masses of webbing that eventually cause the condition beekeepers call galleriasis, which can prompt an entire colony to abandon the hive.2PubMed Central. The Biology and Control of the Greater Wax Moth, Galleria mellonella Mixed in with the webbing you will find dark, rice-shaped frass pellets, the larvae’s droppings, which are another reliable visual clue.
Lesser Wax Moth Larvae Look Different
If you are looking at a wax moth larva and it seems unusually small and slim, you may be dealing with the lesser wax moth rather than the greater. Lesser wax moth larvae max out at roughly 15 to 20 millimeters, noticeably shorter and thinner than their greater wax moth counterparts. Their body is typically a uniform pale white or cream throughout development, without the grayish tinge that older greater wax moth larvae pick up. The head capsule is still darker than the body, but in lesser wax moth larvae it tends to be a lighter brown rather than the near-black of a greater wax moth larva’s head.
Lesser wax moth larvae also spin silk, but their webbing is generally finer and less dramatically tangled. They tend to feed on comb debris, pollen, and cast skins on the hive floor rather than boring straight through brood comb the way greater wax moth larvae do. The damage pattern itself helps with identification: lesser wax moth larvae leave more superficial trails along comb surfaces, whereas greater wax moth larvae create deep, destructive tunnels through the midrib. After hatching, lesser wax moth larvae eat the remains of their own egg shell before moving off to find food.1Journal of Entomology. Observations on the Biology and Larval Instars Discrimination of Wax Moth Achroia grisella F. (Pyralidae: Lepidoptera)
Pupae and Cocoons
When a greater wax moth larva finishes feeding, it seeks a sheltered spot to pupate. Common hiding places include hive frame grooves, cracks in the hive body, and the underside of the inner cover. The larva spins a tough, oval cocoon of dense white silk, typically about 15 to 20 millimeters long, and often chews a shallow depression into the wood where it attaches. These boat-shaped indentations in frame wood are a telltale sign of a past or current infestation. Beekeepers sometimes find rows of cocoons lined up along the top bars of frames or pressed into corners of equipment in storage.
Inside the cocoon, the pupa itself starts out soft and pale cream, gradually darkening as the adult moth develops. Toward the end of the pupal period the wing pads, eyes, and other adult structures become visible through the cocoon wall if you peel it open. The pupal stage lasts one to several weeks depending on temperature, with warm conditions speeding things up considerably. Lesser wax moth pupae are smaller and their cocoons tend to be thinner and less firmly attached to woodwork, but the general shape and placement are similar.
Adult Moths
The adult greater wax moth is a sturdy, broad-bodied moth roughly 15 to 20 millimeters long with a wingspan in the range of 30 to 40 millimeters. Its forewings are the key identification feature: they are a mottled blend of gray and brown with irregular darker patches and wavy lines that provide effective camouflage against wood and bark. The hind wings are lighter, often pale gray or buff, and are hidden beneath the forewings when the moth is at rest. At rest, the moth holds its wings in a tent-like posture over its body, forming a roughly triangular outline when viewed from above.
Males and females look different enough to tell apart with a little practice. Males are smaller and somewhat slimmer, with lighter, more uniform gray coloring. Their wing edges are scalloped, giving the trailing edge a wavy or notched appearance. Females are bulkier, especially in the abdomen when carrying eggs, and their forewings tend to be darker with more pronounced brown and purplish-gray tones. The female’s abdomen often extends visibly past the wing tips. Both sexes have short, thread-like antennae, though males may have slightly more prominent ones. The moth has no functional mouthparts as an adult and does not feed at all; its sole purpose after emerging from the cocoon is to mate and, for females, to lay eggs.
Adult greater wax moths are nocturnal and strongly attracted to the scent of beeswax and hive odors, which is how they find colonies to infest. During the day they rest on hive exteriors, nearby trees, or building walls, where their drab coloring makes them blend in well. If disturbed they tend to scuttle rapidly rather than fly, which gives them a somewhat cockroach-like quality that many beekeepers find unsettling.
Adult Lesser Wax Moths
The adult lesser wax moth is distinctly smaller, with a wingspan of roughly 15 to 25 millimeters. Its coloring is more uniform than the greater species, typically a silvery gray to pale brownish-gray, without the strong mottled patterning that marks a greater wax moth’s forewings. The overall impression is of a smaller, more slender, more plainly colored moth. Lesser wax moth males are known for producing ultrasonic courtship signals by rubbing modified wing scales together. Beyond being an interesting biological detail, this behavior is occasionally relevant to identification: if you hear faint, high-pitched sounds near stored comb, lesser wax moths may be the culprits. Like the greater species, adult lesser wax moths do not feed.
How Infection and Parasitism Change Larval Appearance
Wax moth larvae, particularly Galleria mellonella, are widely used in scientific research as living test subjects for studying infection. This means researchers have documented exactly what happens to their appearance when disease strikes, and those same visible changes can show up in larvae found inside hives.
The most common visual response to infection is melanisation, a darkening of the body. Healthy greater wax moth larvae are pale cream. When they encounter a pathogen, their immune system produces melanin as part of the defense response, forming dark capsules around the invading organisms. This turns the larva’s normally light body progressively darker, sometimes within hours of infection. In laboratory studies with fungal pathogens, larvae injected with certain strains darkened noticeably within about three hours of exposure, even though they did not die until roughly two days later.3PLOS ONE. Conidiation Color Mutants of Aspergillus fumigatus Are Highly Pathogenic to the Heterologous Insect Host Galleria mellonella The degree of darkening tends to correlate with how aggressive the pathogen is. In research settings, a larva that has gone uniformly dark brown or black is considered infected and likely near death.4PubMed Central. Using the wax moth larva Galleria mellonella infection model to detect emerging bacterial pathogens
More dramatically, certain parasitic nematodes produce a striking color shift. When larvae are infected by the nematode Heterorhabditis bacteriophora, they turn a vivid pink-red color and even become bioluminescent, glowing faintly in the dark. This is driven by symbiotic bacteria carried by the nematode, and researchers have described it as a form of warning coloration that may deter predators from eating the now-toxic carcass.5Animal Behaviour. Parasite-induced warning coloration: a novel form of host manipulation If you ever find a pink or reddish wax moth larva in or around a hive, parasitic nematodes are a likely explanation.
Telling Wax Moth Larvae Apart From Other Hive Pests
Beekeepers sometimes confuse wax moth larvae with small hive beetle larvae, since both are pale, worm-like creatures found inside damaged comb. A few visual differences make identification straightforward. Wax moth larvae have clearly defined legs, both true legs near the head and fleshy prolegs along the abdomen, plus a hard, dark head capsule. Small hive beetle larvae are more maggot-like: they have rows of spines along their backs, a lighter-colored head, and lack the prominent prolegs. The webbing is the clincher. If the larvae are surrounded by silk tunnels and matted webs, you are dealing with wax moths. Small hive beetle larvae do not produce silk.
Another occasional mix-up involves bee larvae themselves. When wax moth larvae are very young and small, they can superficially resemble bee larvae that have tumbled out of cells. Bee larvae, though, are legless, C-shaped grubs that are pearly white and lack a darkened head capsule. They also stay put inside their cells and would never be found moving freely across the comb surface or trailing silk. Any small, pale larva crawling actively with a dark head and a silk trail is almost certainly a wax moth.
What Wax Moth Damage Looks Like in Stored Comb
Even when you cannot find the moths or larvae themselves, their damage has a distinctive look. Frames pulled from storage that have been hit by wax moths show a characteristic pattern: irregular tunnels bored through the comb, with silk-lined channels following the midrib. The surface is often covered in a mat of tough, gray-white webbing mixed with dark frass pellets and shed larval skins. Heavily damaged comb can be completely demolished, reduced to a shapeless mass of webbing and debris that no longer resembles honeycomb at all.
On the wooden frames themselves, look for the shallow, oval depressions where pupae attached their cocoons. These gouges in the wood are a permanent record of past infestation and can weaken frames over time if the damage is repeated across multiple seasons. Cocoon remnants, flaky white silk casings sometimes still attached to the wood, are another reliable visual indicator.
Frames with only light damage may show just a few silken trails across the comb surface, sometimes called “bald brood” when the tunneling larvae shave the cappings off sealed brood cells, exposing the developing bees underneath. This partial uncapping in irregular lines across the brood area is often the earliest visible sign that wax moths have gotten a foothold, and catching it at this stage gives you the best chance of saving the comb.
Why Color Varies So Much Within the Same Species
One thing that trips people up when trying to identify wax moths is the wide range of color within the same species and even the same life stage. Adult greater wax moths can range from quite pale, almost silvery gray, to dark brownish-gray. Much of this variation is driven by rearing conditions. Larvae that developed in warmer environments or on darker comb tend to produce darker adults. Humidity plays a role too. Freshly emerged adults often look lighter and become slightly darker or more mottled as their wing scales fully harden over the first day or two.
Larval color is similarly variable. A larva feeding primarily on clean cappings wax stays pale cream for most of its development, while one tunneling through dark, protein-rich brood comb picks up a grayish or brownish body color. Diet also influences body size, so the plumpest larvae in an infestation are usually the ones eating the most nutritious comb. These natural variations mean that relying on color alone for identification is unreliable. The combination of body shape, head capsule color, webbing, and frass is a much more dependable set of clues. Adults are best identified by the tent-like wing posture, the distinctive mottled pattern on the forewings, and the overall body proportions rather than the precise shade of gray or brown.