Other Honey Bee Conditions

Nosema disease

Nosema refers to infection by microsporidian parasites that invade the mid-gut of adult bees. It can shorten adult bee lifespan and reduce colony performance, especially when combined with other stresses such as poor nutrition, long confinement, damp conditions or varroa pressure.

Possible signs include slow spring build-up, increased numbers of crawling or drifting bees, weak adult bee numbers and, in some cases, spotty faecal staining on the hive front or nearby surfaces. The staining is not proof on its own because confinement and poor feed can also cause dysentery.

Definite diagnosis usually requires microscopic examination of bee gut samples. From a practical management point of view, support colony strength, renew old or heavily soiled comb, improve nutrition and seek current advice if Nosema is strongly suspected. For more detail, see the dedicated Nosema guide.

Chalkbrood

Chalkbrood is a fungal disease of brood. It is common in many areas and is often more of a management indicator than a catastrophe, although severe cases can weaken colonies significantly. The most recognisable sign is dead larvae turning into white, grey or black hard mummies inside cells or on the hive floor.

Chalkbrood tends to be worse in cool, damp conditions or where colonies are stressed or under-strength. It is often seen in the early part of the season when brood rearing outstrips the number of nurse bees available to cover and warm the brood nest.

Management usually focuses on improving ventilation, reducing damp, strengthening the colony and replacing badly affected comb over time. If chalkbrood is persistent and other causes have been ruled out, re-queening may be worth considering because some bloodlines appear more tolerant than others. Compare suspicious frames with the chalkbrood guide and the brood pattern guide.

Stonebrood and beekeeper safety

Stonebrood is caused by fungi in the genus Aspergillus. It is relatively uncommon, but it matters because some Aspergillus species can also affect humans. Affected brood can harden into stone-like masses, sometimes with a granular interior.

Suspected stonebrood should be handled with extra caution. Avoid inhaling dust or spores, minimise disturbance, and seek advice from a Bee Inspector or experienced disease officer. Depending on the advice given, affected comb may need to be destroyed and equipment cleaned or scorched.

Because stonebrood can be confused with other brood problems, do not rely on guesswork if you see unusual hardened brood that does not resemble normal chalkbrood mummies.

Amoeba disease

Amoeba disease is caused by the protozoan Malpighamoeba mellificae, which infects the Malpighian tubules in adult bees. It is usually considered a relatively minor disease, but it may weaken colonies that are already under other pressures.

The signs are non-specific and may include reduced adult bee longevity or poor spring build-up. As with Nosema, diagnosis generally requires laboratory examination rather than visual inspection alone.

For most practical beekeepers, the response is to support overall colony strength and address more obvious stress factors first. Improve nutrition, reduce damp, maintain good hive hygiene and check whether varroa, queen problems or poor stores are also involved.

Baldbrood and wax moth damage

Baldbrood describes a brood pattern where patches of comb show uncapped pupae with their heads and thoraxes exposed. It is often associated with tunnelling by wax moth larvae beneath the cappings, especially in older or neglected comb.

You may see rows or clusters of brood with cappings removed, tunnels or debris in the comb, and evidence of wax moth larvae or cocoons in stored comb or unused equipment. Strong colonies usually control small numbers of wax moths themselves, so repeated or heavy damage should prompt you to check colony strength and comb condition.

Replace badly damaged comb, avoid keeping very old dark comb for too long, and store spare frames and supers properly. If the problem is in stored equipment, see the wax moth guide for specific storage and prevention advice.

Malnutrition and starvation

Bees need a balance of nectar or syrup and pollen to fuel brood rearing and maintain adult bee health. When forage is poor or weather traps bees indoors, colonies can experience malnutrition or outright starvation even with a competent beekeeper.

Warning signs include patchy brood with little pollen nearby, light hives when lifted, poor spring build-up and bees dying on the comb with their heads in cells. That last sign is often associated with starvation, especially when stores are absent or just out of reach of the winter cluster.

Prevention is far better than rescue. Check stores throughout the season, feed syrup or fondant when needed according to season and local advice, choose suitable apiary sites, and encourage forage through bee-friendly planting. For more detail, see starvation in bees and your seasonal pages in the Year in the Apiary guide.

Colony collapse-type losses

Many beekeepers experience occasional colonies that dwindle or disappear without an obvious single cause. These may be described as colony collapse in conversation, but in practice they often reflect a combination of pressures rather than one simple event.

Common contributors include high varroa and associated viral damage, poor nutrition, late or insufficient feeding, queen problems, too few young bees, Nosema, chronic stress, robbing, wasp pressure or environmental factors. By the time the colony is found dead or almost empty, the clearest evidence may already be gone.

Clear records are extremely useful. If you administer veterinary medicines while investigating losses, including varroa treatments, keep a hive treatment log and retain it for at least five years. See Veterinary medicine records for record-keeping guidance.

Pulling it all together

These other conditions may sound like a long list, but many of the practical management actions are the same. Keep colonies well-fed and appropriately sized for their site, inspect regularly, use the brood pattern guide when brood looks uneven, and follow a sensible hive hygiene and comb replacement plan.

Monitor and manage varroa and viral disease pressure, because weakened adult bees and poor brood patterns rarely happen in isolation. Local teaching apiaries, association disease officers, BeeBase resources and Bee Inspectors are all useful partners when symptoms do not fit neatly into one category.

Taken together with the rest of the BeezKnees bee-health cluster, this page should help you understand where these other conditions fit in and when to ask for help. The colony health triage tool and Bee Health Checker are good starting points when signs overlap.

Related bee health guides