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Author Topic: Questions regarding ventilated bottom boards  (Read 1725 times)
Yarra_Valley
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Location: Healesville, Victoria, Australia


« on: February 15, 2005, 09:40:30 PM »

Hi there,

I have never come accross ventilaed bottom boards in Australia, so could you all please fill me in on the merits of them?

From what I understand they allow they colony to be cooled more effectively.  Wouldn't this have a negative effect in winter. Is there a problem with the mesh allowing light into the brood chamber?

Thanks guys.

Oh, do any of you use the chat room at a particular time? It would be cool to have a meeting there at a set time.
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Robo
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« Reply #1 on: February 15, 2005, 10:34:02 PM »

SBB do help with ventilation and substantially (if not totally) reduce bearding.

There is some believe that they also help with Varroa control as the mites falling off the bees fall to the ground and can not re-attach to incoming bees.  Regardless if you believe it helps control varroa, it does provide an easy way to determine your mite drop rate.

As for winter, some beekeeps claim to have no problem wintering them with opened bottoms.  I personally have slide in trays, that I use to do mite drop rates and close the screen off in the winter.


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asleitch
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« Reply #2 on: February 16, 2005, 04:07:34 AM »

Quote from: Yarra_Valley
.  Wouldn't this have a negative effect in winter..


Or actually the opposite - it has a postiive effect. By allowing the moisture out , it provides a healthier environment for the bees. It is damp not cold that kills most colonies.

I overwinter all my bees on mesh floors. They all survived bar the little one which was poor all last summer/autumn.

It's important to close off any top ventalation (in the UK at least) as you don't want a chimney effect of warm air rising up out the colony. Warm air rises and is trapped at the top of the hive.

Our National Bee Unit is recommending all bee keepers switch to these open mesh floors, and this information is being disseminated via the local bee inpsectors.

It is especially good when applying varroa treatments, as partially resistant mites, which may be knocked off, recover and climb back up, fall through the mesh and do not return.

As many as 20 - 30% of mites are thought to "drop off" in any period, and  if they can't climb back up - thats a significant bio-friendly method.

I have suffered no effects as a result of using mesh floors, and as they can ventilate through the bottom to drive of moisture in the summer, you can keep the enterances narrow at all times, - I never ever remove my entrance restrictors. Hence I seem to be the only beekeeper I know who didn't suffer any losses due to wasps at all this summer. Perhaps having them in place all through the season helps. Maybe wasps start sneaking in earlier in the season than we think - and hence learn to come back once their protien source dries up. Anyway, I had no problems with wasps at all.

It's also easier to smoke, - just a few puffs under the hive is all thats required, - it evenly wafts up through the frames.

Light is not an issue - just look at a ferral colony which builds on a tree branch.

I do however stick a 2 inch thick piece of polystyrene over treh hive roof in winter - to keep the frost off the roof - even through the underneath is completely open.

All my hives have come through strong - a sign of the benefits perhaps?

I've never seen "damp" comb since I started using them - just in other peoples hives these days!  Shocked

Hope thats of help.

Adam
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Yarra_Valley
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« Reply #3 on: February 20, 2005, 08:24:34 AM »

Robo and Asleitc - thankyou both for the very detailed responses to my post. A new idea to introduce over here wink .
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