Hello

Here is a good pdf on the spraying of OA, but it is in German. Perhaps you
could
get an English version at the author.

http://www.apis.admin.ch/de/krankheiten/docs/saeuren/os_spruehen_d.pdf

Contactform of Mr. Imdorf:

http://www.apis.admin.ch/de/ueberuns/feedback.php?nummer=3

regards,
dieter schuerer, Switzerland

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