July 21 2024 23:23:47

Online Stats
Guests online: 1
Members online:
no members online

registered members: 76
unactivated members: 0
newest member: link

user today: 388
user online: 1
Max. onlinerecord: 133
Max. per day: 11106
user yesterday: 115
user month: 5397
Entire users: 578968

last 24h:

View Thread
Eurobees » Beekeeping » Bee health
 Print Thread
AFB-American Foulbrood
AFB-American Foulbrood

photos taken in Canada.

American Foul Brood (AFCool, is caused by the spore-forming Bacillus larvae. It is very widespread and destructive as a bee brood disease. The larvae is a rod-shaped bacterium, and is visible only under a high-power microscope. Bee larvae up to 3 days old are infected by ingesting spores present in their food. Bee larvae less than 24 hours old are the most susceptible. Spores germinate in the gut of the larva and the bacteria begins to grow being nourished by the larva. Spores will not germinate in larvae over 3 days old. Infected larvae normally do not die until after their cell is sealed. As it grows, the vegetative form of the bacterium will die but not before it produces many millions of spores. And so, each now-dead larva may contain as many as 100 million spores. The disease only affects the bee larvae and it is highly infectious and deadly to bee brood.

The best field test is to touch a dead larva with a toothpick, twig or matchstick. It will be sticky and "ropey" as it is withdrawn from the cell. AFB has a very specific odor, and experienced beekeepers can sometimes detect the disease upon opening a hive. Indeed, at one time whilst I was working for a commercial beekeeper who had a major AFB problem, I was able to enter a yard and accurately mark all the affected hives just by standing in front of the entrance and picking up the odor. On an infected frame, capped sunken cells are present. Some of the cells are usually only partially capped. So, combined with the smell, sunken cells, shrivelled dark-colored larva and matchstick "test", it is usually a fairly easy diagnosis.

Spreading the Disease : As the bees work removing the dead larvae and cleaning the cells, they move and distribute the spores right through the hive. Stored honey is also contaminated with spores. Eventually the hive weakens from the infection and loss of brood. Robbing will then easily occur and the diseased honey will spread through other hives and apiaries. Additionally, as the beekeeper works the hives, infected bee equipment will be removed and mixed and exchanged into other hives, infecting and spreading the disease.

The AFB spores are extremely long-lived and resilient and can remain viable for 40 plus years in honey and beekeeping equipment. Thus honey from an unknown source should never be fed to bees, and used beekeeping equipment should be considered a risk.


Jump to Forum:

Classified Ads
Latest Classified Ads
» Kristette handycraft
[For Sale Ad]
Posted: 11/15/2014

1 Ad Total

Version 4.2

  Theme Designed by Ankur Thakur and modified by eurobees.eu 1,234,195 unique visits