Oxalic treatments, can they be mixed?

[fatshark]

Considering how delicate eggs and young larvae are, I think it would be a minor miracle if a fine coating of oxalic acid crystals coalescing on them didnt kill a good proportion (similarly a high conc. of thymol or formic acid vapour kills alot).

Surely anyone treating with brood present - the three times at 5 day interval regime - would be aware of large-scale slaughter of unsealed brood? I've done this treatment several times and haven't observed this. There are additional studies where colonies have been treated every week without apparent detrimental effect (see Randy Oliver's pages for that). I don't think anyone is saying that there's no brood damage, just that it's not extensive.

I've treated casts and the Q has subsequently got out to mate.

There's a thread of Beesource about this ... Does vaporised oxalic acid kill open brood? ... Michael Palmer replied:

No. I marked open brood on combs in the broodnest, vaporized three times a week apart, and looked at the marked combs. What was eggs and larvae was now sealed with no apparent loss of brood.

 

[mbc]

Surely anyone treating with brood present - the three times at 5 day interval regime - would be aware of large-scale slaughter of unsealed brood? I've done this treatment several times and haven't observed this. There are additional studies where colonies have been treated every week without apparent detrimental effect (see Randy Oliver's pages for that). I don't think anyone is saying that there's no brood damage, just that it's not extensive.

I've treated casts and the Q has subsequently got out to mate.

There's a thread of Beesource about this ... Does vaporised oxalic acid kill open brood? ... Michael Palmer replied:

No. I marked open brood on combs in the broodnest, vaporized three times a week apart, and looked at the marked combs. What was eggs and larvae was now sealed with no apparent loss of brood.

Excellent fatshark, thanks for the link.
Interesting observation by Mike, it would be good if he could elaborate his experiences for us, it seems he made some rigorous observations, but considering his treatments didnt have the required mite knock down there could be something else at play we are not aware of which might also have effected his no brood mortality observation.