Chalk brood

[Do224]

I’ve four colonies. Two are doing great and were given an extra brood box about 10 days ago. The other two are struggling and each only working about 7 frames. They’ve both got a few old black frames which probably should have been replaced. They both have a lot of chalk brood which I feel like is their main issue. Should I;

(a) give them a chance and wait and see
(b) combine them
(c) requeen them when I get cells I can use from one of my good hives.
(d) something else!

 

[Erichalfbee]

If they were mine I would combine them, wait to see how the colony goes and be prepared to requeen with a mated queen

 

[ericbeaumont]

give them a chance and wait and see

Chalk due to winter damp disappears in better weather, so yours is likely to be genetic, for which the answer is to re-queen from a different strain.

The non-chalk colonies may be carrriers, but strong enough to shrug it off. At some point, replace infected kit and clean it in the usual way: scrape, scrub with washing soda/ bleach, or scorch.

 

[Michael Palmer]

I would requeen them with hygienic stock. I'm not sure if anything like that is available to you.
Are there any UK queen breeders who are using the frozen brood assay for identifying hygienic stock? Believe it when I say,
at one time my operation was stinky, rotten with chalkbrood. 800-1000 colonies. I requeened all chalky colonies with the tested queens.
Chalkbrood disappeared in a month, as soon as the new queens bees emerged. To this day, 20+ years later I see, practically, zero chalk in my operation. Today, my breeders are all tested with the Frozen Brood and UBO assays.

 

[user 819]

C.
B. If they look weak.

In the past even with just mild CB , I have requeened /changed the Q line of that particular colony.

 

[Do224]

I think I’ll wait until the start of May and then pinch a frame of eggs from my best colony and give it to the chalk brood colony to make a new queen with (after squishing their existing queen)

 

[Hebeegeebee]

From my experience, chalk brood follows the queen - I've tried it by putting one in a chalkbrood-free hive.
And if a chalk-brood frame goes into a good hive, the chalkbrood goes and it does not contaminate the remainder of the good hive. It might not always be the case and I would not reccomend it as a strategy, however from the limited tests I have done, it's more of a genetic issue (like occasional bald brood, say) rather than anything else.

 

[Do224]

Is chalk brood sometimes a bit of an early season problem? I noticed on my last inspection that whilst these colonies seem slow to build up, the chalk brood does seem to be less than it was (although it’s certainly still there). Both are black bee colonies

 

[Swarm]

Is chalk brood sometimes a bit of an early season problem? I noticed on my last inspection that whilst these colonies seem slow to build up, the chalk brood does seem to be less than it was (although it’s certainly still there). Both are black bee colonies

Chalk brood tends to clear up as the season improves and many consider the warmer temperature and drier weather to be a factor. Early flows and the positive effects of the nectar processing with beneficial enzymes added by the bees during this process are a little like self medication that clear up minor issues.
In some colonies the problem can be chronic, seriously impeding build up so best dealt with by requeening.
There could of course be other reasons for slow build up.
I have only had two colonies where I considered the chalk brood to be bad, the first would clear up and still build up into a strong double brood colony and one year produced some of my best cut comb supers. I ran with this colony for a few years as they never once attempted to swarm and superseded three times during their time. The chalk brood remained similar so obviously a genetic line that was susceptible, I replaced them in the end. The other one was a yellow queen with a miserable brood nest and mummies outside the entrance so she was culled.

 

[Do224]

I’ll persevere with them for now. I recently had to nuc the queen from my strongest and friendliest hive. Once I’m confident the original hive has requeened successfully, I think I’ll squash my chalky queen and unite with the nuc.