Yes, this trial is North American wide.  It has two parts:
1.  Screen bottom efficacy improvement in Canada and parts of the USA
where there are no beetle.
2.  SHB repellent - mostly the southern states and with two versions -
with or without screen bottoms.

As this trial will require a lot of work it may be of advantage for each
participant to handle just 4 - 6 hives and be part of an assigned "group".

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