Allen asked if we used apivar as a finishing treatment.

Yes we did and we collected mites every 7-10 days for 45 days. Our results showed evaporation of 2 times Oxalic acid; 15 days apart yielded 93%. One treatment yielded 60%. There was some brood in the hives that might made a difference.
Regarding opening hives and impact on survivorship, I am just old fashion. If I don't need to disturb my bees I would not do it. In research we have to  open hives, but we keep it to minimal.
It is good idea to test just opening hives in winter vs not. It might be tricky. Medhat
This email and any files transmitted with it are confidential and intended solely for the use of the individual or entity to whom they are addressed. If you have received this email in error please notify the system manager. This message contains confidential information and is intended only for the individual named. If you are not the named addressee you should not disseminate, distribute or copy this e-mail.

             ***********************************************
The BEE-L mailing list is powered by L-Soft's renowned
LISTSERV(R) list management software.  For more information, go to:
http://www.lsoft.com/LISTSERV-powered.html

Guidelines for posting to BEE-L can be found at:
http://honeybeeworld.com/bee-l/guidelines.htm