Glossary
A practical guide to evaluating honey bee brood patterns as indicators of queen quality, colony health, and potential disease. The pattern of capped brood on a frame tells an experienced beekeeper volumes about the queen's laying rate, fertility, age, and the colony's overall health status.
A healthy brood pattern shows a solid, compact oval of capped brood cells with very few empty cells interspersed. The capping color should be uniformly tan to brown, slightly dome-shaped (convex), and dry in appearance. A frame with 90+ percent of cells filled in the brood area indicates a strong, productive queen.
The brood pattern typically appears in concentric rings: eggs in the center (most recent laying), uncapped larvae surrounding the eggs, and capped brood in the outermost ring. This concentric pattern reflects the queen's systematic laying pattern moving outward from the center of the nest.
Shotgun brood (scattered capped cells with many empty cells) indicates a failing queen, inbreeding (poor sperm viability), or disease (bees removing infected larvae, leaving gaps). If shotgun brood develops in a previously solid colony, the queen may be aging out and needs replacement.
Sunken, greasy, or perforated cappings (dark, wet-looking cells with small holes) are serious warning signs of brood disease, particularly American Foulbrood (AFB) or European Foulbrood (EFB). Perform a ropy test: insert a toothpick into suspicious cells and withdraw slowly. If the contents stretch into a ropy, stringy thread, AFB is likely. Contact your state apiary inspector immediately.
During peak season, a strong queen should maintain 6-8 frames of brood in a 10-frame box, with at least 80-90 percent of cells filled in the brood area of each frame. Less than 4 frames of brood during peak season may indicate queen failure, disease, or nutritional stress.
Normal brood cappings are light tan (new comb) to dark brown (old comb with many use cycles). Mixed drone and worker cappings look different because drone cells are larger with domed cappings. Dark, greasy, or perforated cappings are abnormal and warrant disease investigation.
Scattered drone brood among worker brood (drone cells are larger and more dome-shaped) may indicate a failing or poorly mated queen laying unfertilized eggs in worker cells, or a laying worker (unmated workers laying only unfertilized drone eggs). Both situations require intervention.
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