Information About Nosema With Adult Honey Bees
Nosema is the most widespread of the adult honey bee diseases. A single celled animal named Nosema apis, a small, unicellular parasite specific to the honeybee, causes it. Nosema cannot exist in a laboratory culture, as with most bacteria and fungi. It will only thrive and multiply in the epithelial cells of the honey bee ventriculus which causes dysentery. Queens, drones and workers are all susceptible to Nosema. The spores of the Nosema must be ingested for the bee to be infected. The spore takes root in the midgut, where they will penetrate a midgut cell and grow by absorbing nutrients from that cell. The parasite will increase in size until it is large enough to divide in half. Each new parasite will continue to feed on the nutrients of the cell until they are depleted. In a matter of time, about 6 to 10 days, 100 new spores are formed in the infected cell. The infected cell when depleted of all the nutrients ruptures releasing all the newly formed spores into the midgut to start the process again. The damaged intestinal tissue is susceptible to secondary diseases. Dysentery is a common symptom of this disease. You will be able to spot the dysentery on the outside of the hive by the little brown spots, but the diseased bees will also defecate inside the hive. contaminating combs with millions of infectious spores. The disease is spread to other colony members through fecal matter.
Nosema having infected one bee will be spread to others in the colony. The disease lowers the life span of the bees. If you have a colony of bees infected with Nosema in late fall, come spring it is likely that most of the colony will have died off.
Nosema is a difficult disease to diganose without using laboratory equipment. Decapitating a bee and pulling out the last abdominal segments usually will remove the intestinal tract while still intact. An infected midgut will become swollen, whitish and lose its visible constrictions. However, other causes of dysentery, such as ingesting honeydew, fermented syrups, etc. can result in similar intestinal changes.
Treatment for Nosema is based on the most appropriate times to prevent comb contamination and to prevent the development of disease in bees that clean up fecal deposits from combs while they are still trying to expand the brood nest. A few bees are always infected, but the diseased late season bees are the only one of any concern. If they develop high levels of infection, they defecate on the combs in October, November, and December, and then they die. The use of fumagillin has been field tested by some beekeepers with acceptable results. When treating use the manufacturer’s instructions.
Visit the Bee Facts website to learn about mason bees and bees disappearing.
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The Good, the Bad and the Buggy
Bugs! Most of us got over liking them somewhere around the age
of 12 after the ant farm went belly up and we began to
appreciate how annoying mosquitoes, wasps and chiggers could be.
Then as adults, we learned to despise roaches, gnats and the
beetles that feast upon our gardens. But as many of you already
know, some of those pesky bugs can actually be good for the
garden. Not all beetles are bad with ground beetles doing their
part to help develop fertile soil. Honeybees are important in
the pollination process in our gardens and many of their more
fearsome cousins love to eat caterpillars and other insects that
devour the leaves of our favorite trees and shrubs. Of course,
we all love ladybugs dining out on aphids, we just have to get
over their tendency to congregate in our windowsills.
In the meantime, here’s a brief primer on good bugs and what
they do to help us out in the gardens at Biltmore Estate in
Asheville, NC, and in your garden at home: · Ladybug – Both the
larvae and the adult insects feed on aphids, the bane of the
rose gardener. · Lacewing – These diaphanous little guys look
delicate, but will devour aphids, caterpillars, mealy bugs,
leafhoppers, insect eggs and whiteflies. · Dragonfly and
Damselfly – Naiads (immature state) feed on mosquito larvae
while the adults will rid you of both mosquitoes and moths. ·
Hover Fly – The larvae get their start in the world by devouring
dozens of aphids in a single day. · Bumblebee & Honeybee – These
bees are important for pollination, especially in fruit trees
and, of course, you may be contributing to someone’s supply of
honey. · Braconid Wasp – While it may seem contrary to wish for
a wasp, these guys are parasites for European corn borers, leaf
mining sawflies and bark beetles. The lesser evil? · Ambush Bug
- If you can’t quite warm up to wasps, Ambush Bugs will rid you
of them along with bees and flies. · Damsel Bug – Another help
for the aphid problem as well as caterpillars. · Praying Mantis
- This one is a bit of a toss-up. The mantis will eat a variety
of insect pests, but it will also eat beneficial insects. ·
Ground Beetles – These largish beetles like to root around under
leaf litter or mulch dining on insect eggs and larvae.
As for inviting all these wonderful bugs into your garden, the
easiest way is to plant flowers and herbs that they like. Many
beneficial insects are fond of herbs including fennel, dill,
cilantro and caraway. You might also try yarrow, coreopsis,
geraniums and wild carrot as attractors. Members of the
sunflower family including asters, cosmos, purple coneflower and
zinnias are insect friendly, not to mention colorful additions
to your landscape. Winter cover crops like buckwheat or clover
are also favorites.
In addition, your beneficial bugs will require water and
protection. Use overhead watering to leave little puddles, or
put out a shallow dish of water that offers hydration without
drowning the insects. As for protection, ground beetles like
mulch or leaf litter, while leafy plants offer flying insects
good hiding places from birds or other predators. And the really
good news is that beneficial insects will actually appreciate it
if you miss a weed or two.
Bruce Ballard, Biltmore Estate Landscape Supervisor, has worked
in the gardens of Biltmore Estate, George Washington
Vanderbilt’s turn-of-the-century home, for more than fifteen
years. Encompassing both formal and informal designs, the 75
acres of gardens and grounds are at the heart of the nearly
8,000-acre estate. Ballard oversees the day-to-day operations of
three garden crews, responsible for approximately 100 acres of
manicured gardens and roadsides.
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