Brood loss has been indicated as a possibility when using Formic acid as 
a miticide.

Since I have used this acid as a treatment for low level varroa mite 
control (my colonies, as last year are showing a low level of brood 
presence at this period and temperatures have been near perfect), I 
would be most grateful for any information on what Formic acid damaged 
brood looks like.

Has it any particular characteristics?

Thanks in advance,

Peter

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