Agriculture Reference
In-Depth Information
Treating for bald brood
There is no treatment for bald brood other than to re-queen if it seems to be a genetic
trait, or to build up the colony by uniting it or adding brood if the problem is wax moth
larvae. Remember, a large, healthy colony can deal with wax moth predation.
Brood disease problems: a summary
Because of the similarity especially of the early symptoms of the brood diseases so far
described, the points below should help you to distinguish them:
AFB: The larvae are ropey and discoloured (dark brown) in unsealed cells or, in
cells with perforated, sunken discoloured cappings. The larvae dry to hard scales
that are difficult to remove.
EFB: The larvae are in an unnatural position in and around the cell walls. They
may be white through to a discoloured, yellow to dark brown. The larvae are
watery, granular or, occasionally, ropey.
Sacbrood: The larvae are discoloured, brown through to black. Chinese slipper or
gondola-shaped larvae are found in capped cells or under perforated caps. These
can easily be removed.
Chalkbrood: The larvae are white and mouldy. Hard larvae (mummies) are white
or grey/black and are found in the cells on the floor or on the alighting board at the
front of the hive.
Chilled brood: Larvae of all ages die at the same time. The problem is usually
confined to the periphery of the brood area.
Bald brood: The larvae remain healthy and pearly white. They usually pupate
normally.
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