Allen Dick wrote:

>
>
> Since many BEE-L members use the screened bottom boards and some use
> menthol, can anyone confirm this and, if so, comment on the degree of mite
> drop?  We have started to use menthol in Blue Shop Towels, and wonder if
> there is a side-effect on the varroa.
>
> NOTE:  I am NOT saying this is true, and I do not want to start a mindless
> rumour that menthol works on varroa.
>

 Hi Allen and All,
 I have been using peppermint oil for years and it does not kill the mites. I
have all my hives on screens
and do not see a change in mite drop.
With that said, Varroa reproduction in the cells can be reduced greatly if
menthol ( mint ) in the brood nest. ( cells)
The relationship between the larva and Female Varroa has been researched by Dr.
Harbo. He has found that larva give off a pheromone that induces the mite to
lay eggs. Through observation with mint present in the brood nest , mite
population will go down. I  think it mask's the pheromones of the larva. The
problem for beekeepers is getting the mint (menthol) in the cells.
 I did put peppermint oil in a jar with Varroa and it did not kill the Varroa.
By the way, all peppermint oils you buy are NOT equal..Thats a subject all by
itself.
Best Regards
Roy