Hi Juanse,
In Spain, beekeepers can use this approved treatment based on oxalic
(ECOXAL), using poweredsugar solution and lefting it on top of frames (not
exactly but over bees covering frames, between frames)
Here you can see label instructions
http://www.norvet.es/FichasProductos/CEVA010.pdf
P. David Quesada
Honey Bee Lab
Spain
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