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| Chalkbrood, whereby the larvae becomes mouldy with white hyphae (vegetative body of fungi), then hardened to be similar to pieces of white chalk (hence the name). Caused by a fungus (Ascosphaera apis), this disease is mostly considered a "stress" disease, only occuring in weak, or in otherwise stressed colonies (pesticide kill, not enough workers, sudden cold spell in spring etc). The spores are ubiquitous but can only germinate in larvae when the core brood temperature is 2-3 degrees below normal (35 C or 95 F). There is no chemical treatment. Photo by Prof. M.V. Smith, University of Guelph. Viewed: 3032 times. | | | |
| Chalkbrood mummies removed from cells. The two on the top are producing spores, while the three below are at a slightly earlier stage. Photo by Prof. M.V. Smith, University of Guelph. Viewed: 2457 times. | | | |
| Chalkbrood mummies removed from cells. The mummies in the top row are producing many spores, which make the mummie totally black. This stage is now contagious. The mummies in the bottom row are nto producing spores yet and if workers remove them now, the reinfection cycle is broken. Photo by Prof. M.V. Smith, University of Guelph. Viewed: 2348 times. | | | |
| DSCN4808.JPG* Viewed: 2284 times. | | |
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Album: Disease & Pests 
1 
