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chalkbrood_spore

chalkbrood_spore

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.

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