>> Lactic acid - it has to be sprayed on the bees just like the oxalic acid
>
>What are the proportions in the spray?
 
 
 
You can use the cheap commercial form of lactic acid (mixture of D- and
L-Form). Every comb has to be taken out of the hive and has to be sprayed
each side with 5 ml of lactic acid (15% solution in water). Varroa only on
the bees are killed (efficiency over 90 %) but not the varroa inside brood
cells. Therefore you will have to repeat this spraying once or twice in
order to kill some of the later hatching mites, too. Best will be if this
work is done when there is only a small amount of brood in the hive (autumn
in Europe). Temperature when spraying the combs should be over 5 0C
 
 
Reimund
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Beekeeper in Germany (Bavaria)
Queen Rearing of Carniolan Bees
Insemination Station
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500  North, 110  East
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