Brood can become overheated when there is a sudden loss of worker bees to cool the colony during hot weather. Worker bees can overheat if they are confined in their hives during hot weather without proper ventilation or access to water.


  • Dead larvae that turn brownish or black and are watery
  • Pupae have a black, greasy appearance
  • Newly emerged adult bees are wingless
  • Cappings of brood cells can appear melted, darkened, sunken, and punctured
  • Adult bees crawling around rapidly while fanning their wings
  • Adult bees appear wet, and their wings hazy
  • Abnormally large accumulation of dead bees at hive entrance


  • environment - hot weather


  • Clinical signs


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