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sacbrood_side

Side view of dead larva killed by sacbrood virus. Notice the discoloration and hardening of cutiles near the head. Photo by Prof. M.V. Smith, University of Guelph. Side view of dead larva killed by...

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chalkbrood_cell

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...

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chalkbrood_out

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. Chalkbrood...

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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...

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DSCN4808

DSCN4808.JPG DSCN4808.JPG

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chewup_waxcocoon

Closeup view of the emptied cocoons from where the adult moths have emerged. Photo by Prof. Zachary Huang, Michigan State University. Closeup view of the emptied cocoons from where the adult moths...

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P2080223

The greater wax moth (Galleria mellonella) larvae, shown with various instars. Photo by former graduate student Anne Hanley. The greater wax moth (Galleria mellonella) larvae, shown with various...

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waxmoth1

A comb severely infected with the greater waxmoth. The while ones are the cocoons spun by mature larvae just before they pupate. Silk and frass are everywhere making this frame not usable for...

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waxmoth2

Just before the wax moth larvae spun their cocoons, they use the mandibles to chew an indentation on wood so that the cocoon would attach better. Notice the dead workers near the lower left of the...

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waxmoth3

The lesser wax moth (Achroia grisella, Pyralidae), causing similar damage to the greater wax moth but is not as common in Michigan. Photo by Prof. M.V. Smith, University of Guelph. The lesser wax moth...

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DSCN4803

DSCN4803.JPG DSCN4803.JPG

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tracheal

A cross section of the thorax of a worker, showing the main thoracic trachea of each side. Trachea from healthy workers should be white with a silvery reflection. The ones here are infected with...

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tracheal_mite

Two tracheal mites (Acarapis woodi) inside a worker trachea. Too many mites in there obviously blocks the airway of workers and workers become physically weaker and cannot fly as far and die earlier...

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pupalmite_s

Varroa mites (Varroa destructor) on a drone pupa that was removed from its cell. Varroa mites (Varroa destructor) on a drone pupa that was removed from its cell.

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varroa1

No, this is NOT a staged picture! Last October some colonies were dying and being robbed. On close inspection they were having very severe cases of PMS (parasitic mite syndrome). Very few brood cells...

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varroa2

Another larva with 5 varroa mites on one side, I am sure a few ran away... You can tell that the larva was dead by its abnormal coloration. MSU apiary. Oct 14, 2002. Another larva with 5 varroa mites...

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miteonbee

A varroa mite (Varroa destructor) on the back of a worker bee (the one in the center). A varroa mite (Varroa destructor) on the back of a worker bee (the one in the center).

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DSCN0963

Stages of varroa (Varroa destructor) mites. Younger ones on left, all white mites will die when a bee emerges out. The 2nd one from right would be able to live. Her cuticle will become redder after...

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miteunderscope

Varroa mites (Varroa destructor) floating in alcohol under a dissecting scope. Varroa mites (Varroa destructor) floating in alcohol under a dissecting scope.

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mitedamage

A varroa mite (Varroa destructor) on the back of a worker bee. The bee on the bottom has her wings unexpanded -- a sign of varroa damage during her pupal stage. A varroa mite (Varroa destructor) on...

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