Sorry Allan:
I guess me being slow!
It is calculated after the three treatments of Hopguard. Then we applied Apivar as a finishing treatment. All collected mites were then counted and calculated based on the relative efficacy to Apivar. The efficacy was 40% relative to Apivar.

We have also calculated the washed 300 mites / hive before and after the three Hopguard treatments. The efficacy was 55% reduction of mites on bees.

Before you hit me with another question.

Mites doubled their  number in the control without treatment over the treatment period based on collected killed mite after using the finishing treatment. For the 300 bees washed bees the mite % infestation went down by about 20%.  Keeping in mind the bee population doubled during spring.

For fall the story is different. Mites tripled in the untreated control based on collected dead mites from the finishing treatment. In the washed 300 bees  the mite increased 7 times in the untreated control during the treatment period.

Allan A lot of mite counting, we suffered from nightmares (mitemares) when you think about it.

Randy: by the way regardless you try to use harmonized groups of certain percentages of mite infestation and colony strength, bees don't very much follow rules and don't like to follow what researchers like to do with them. They are wired differently.

Medhat

Dr. Medhat Nasr
Alberta Provincial Apiculturist
Pest Surveillance Branch
Research and Innovation Division
Agriculture and Rural Development
17507 Fort Road NW
Edmonton, AB T5Y 6H3 Canada
Tel: 780-415-2314             Fax: 780-422- 6096
E-mail:  [log in to unmask]


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