Winter management is an important part of
producing good bees. Advantages and disadvantages of the following
methods are presented in order of preference:
- Place bees in a cold storage room.
- Move bees to a shed or barn.
- Leave bees in the field.
I. Place bees in a cold storage room at
34-38°F and 50 percent relative humidity.
Advantages:
- Temperatures maintained at < 40°F prevent damage from
nest-destroying insects; 50 percent relative humidity inhibits mold
growth but prevents the cells from drying out.
- Nest materials can be inspected and evaluated for nest-destroying
pests, empty cells, etc.
- Bee emergence can be more easily synchronized with alfalfa bloom
by incubation after cold storage. Thus, bees are available when they
are needed.
- Reduce chance of theft.
- Nesting material from which the bees have been extracted can be
sterilized for recycling.
- Maintenance, cleaning and sterilization of domiciles can be
accomplished.
- Prevents fall buildup of predators and nest-destroying insects.
- Bees are less likely to use up energy
reserves in warm fall weather, so they are more likely to emerge in
the spring.
Disadvantages:
- The cost of moving bees and storing them.
- Mechanical failure may permit relative humidity to rise beyond
safe limits (70 percent) stimulating mold growth and causing bee
mortality. When the temperature rises to 40°F, nest-destroying
insects become active; 110°F will kill the larvae in the cells.
- If boards are stacked too close to allow good air circulation,
temperatures in boards may rise above air temperature due to bee
metabolism, and allow predators to develop.
II. Move bees to a shed or barn.
Advantages:
- Nest materials can be inspected and evaluated more easily for
living larvae, nest-destroying pests, dead cells, etc.
- Bees begin to emerge about the time alfalfa normally starts to
bloom if they are placed in field shelters about 40 days before
bloom.
- Maintenance, cleaning and sterilization of domiciles can be
accomplished.
Disadvantages:
- Bee emergence may not coincide with alfalfa bloom when the bloom
is delayed by cultural practices or weather.
- Bees emerge over an extended period of time from June until
August. Too few bees may be active when the maximum bloom is
present.
- The cost of moving bees and storing them.
- The concentration of nest materials in storage may promote the
spread of nest-destroying insects from infested nests.
- Lack of temperature control encourages nest-destroying insects
which are increasingly more active as temperatures rise above 40°F.
- Lack of temperature control may cause some bees to use up energy
reserves during the winter so they are not successful in emerging in
the spring.
- Higher risk of rodent and/or bird damage.
- Increased risk of fire or loss due to theft.
- If boards are stacked too close to allow good air circulation,
temperatures in boards may rise above air temperature due to bee
metabolism, and allow predators to develop.
III. Leave bees in the field.
Advantages:
- Saves the cost of moving bees and storing them.
- Bees will overwinter in most areas if protected from direct
exposure to the elements.
- Bees will begin emerging about the time alfalfa normally starts to
bloom in the spring.
Disadvantages:
- Prolonged exposure to temperatures below -20°F may kill some
bees.
- Bee emergence may not coincide with alfalfa bloom when the bloom
is delayed by cultural practices or weather.
- Bees emerge over an extended period of time from June until August
and therefore too few bees may be active when the maximum bloom is
present.
- Lack of temperature control encourages nest-destroying insects
which are increasingly more active as temperatures rise above 40°F.
- Lack of temperature control may cause some bees to use up energy
reserves during the winter so they are not successful in emerging in
the spring.
- This practice presents the highest risk of loss from theft.
- Rodent and/or bird damage may occur.
- Domiciles cannot be easily cleaned and sanitized for chalkbrood
and nest-destroying insect control.
If you have comments, corrections, or additions to the information provided
in this document, contact Karen.
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