Screened Bottom boards do NOT effect the use of menthol.  Put menthol on the
top bars of brood frames, and menthol fumes are heavier than air and go down.

The greatest mistake is trying to use menthol in cool temperatures.  Around
the
Washington DC and Baltimore area, menthol should be used by August 15th and
generally (not always) September is TOO LATE.

George Imirie

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