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It is kind of you to offer, but these days it is rare for me to be in your neck of the wood - and the carriage would be prohibitive. I shall watch out and see if they come back - doubtless at a higher price

Many thanks. They look to be just the job. Unfortunately, as the Lidl tautologous slogan goes, "When it's gone, it's gone":

I am not sure we want a photo of that...

"Bottom ventilation is obviously the natural trend, and ‘top ventilation’ is alien to them. In man-made hives we have created manmade problems and these need man-made solutions at times."

Thanks, they look good. How thick / substantial are the OSB / chipboard shelves? I have been caught out in the past buying shelving where the metal structure was adequately robust, but with shelves made of little more than hardboard.

Yes, I too have heard that many, many times, including from the NBU. Trouble is; no-one has ever been able to back that up with any evidence - including the NBU when I challenged them. On the matter of ventilation I can recommend the authoratative 1947 book by E.B. Wedmore "The Ventilation of...

...and here he is removing an Asian hornet nest :

Thanks. I shall remove the offending snap

par example: Frelon Asiatique » Lutte and a European hornet having one of my bees this morning:

I have just had that, a queenless colony, today. The queen was old and the colony weak so I had scheduled to unite it with a stronger colony. When I went to do the unite today I found no queen, no eggs and one forlorn queen cell. There was room to lay and I have no reason to think that I had...

If, as would seem, you are based in France, you will get far more useful information from your local beekeeping assocation than from this forum, There are a few France based beekeepers on the forum, but the rest of us have little or no experience of le frelon asiatique...

Just to cheer you up: Hasemann L. How long can spores of American foulbrood live? Am Bee J. 1961;101:298–9

...but the Porter bee escapes are only 50p! Perhaps we should have competition of suggestions of what they are best used for - keep it clean, please

Interesting paper, thanks.

Virkon S is modern sterilizing stuff instead of bleach. Virkon S would fit with a strategy of going overboard as it is a viricide as well as a bactericide, whereas AFB is the result of a bacterium.

...black being the most effective way of radiating and thus losing heat from the hive at any time the outside temperaure is lower than the temperature inside the hive ~35C

https://www.secondsandco.co.uk/ Useful if you are not too far away, but likely to be expensive to have delivered, unless by the pallet load

https://www.bbc.co.uk/news/world-africa-58622482

Thermal conductivity recycled chip foam 0.075 W/mK Thermal conductivity of sheep's wool insulation 0.035 – 0.04 W/mK Thermal conductivity of PIR (Kingspan etc) 0.022 W/mK