ok, thanks to all. I will try the oxalic dribble and leave the formic for a
higher temperature. I may even skip the treatment for a couple of weeks. I
will sample a bit more.

I will cut off some capped comb, freeze it, and tell you what I can see
inside when I have time.
Which are the bets? Lots of varroa per cell?

The varroa is been sampled out of the outer cluster bees.

On a side note, what is interesting is the bigger load of varroa that we can
see on the oregano trial colonies, plus other numbers on those colonies that
suggest a different behaviour between the oregano and the fumagilin treated
colonies during fall. Better for oregano will explain a higher varroa load
(longer brood cycle?)

As you know already, I am running an experiment with 40 colonies treated
with fumagilin while other 40 treated past autumn with oregano (orego-stim).
None of them received a varroa control in autumn. They were treated with
amitraz when we moved them as 5 frame nucs to the brood box in summer
(january). They were pollen suplemented.

At the start of the experiment (march) they were 7.5 frames of bees
colonies. Nosema loads were sampled before and after the trial.

We assumed similar varroa loads on all colonies.

The cluster size is more homogenous on oregano group, while the fumagilin
group have a drone layer, smaller clusters and one more dead colony.

Nosema loads are still under threshold on both groups, but the oregano
treated have a slightly higher count.

Cluster size reduced less on oregano trial.


Population


Nosema spores
Varroa



FB March s FB July s FB March pop FB July pop Before(march) After (april) After
(July) V 60 bee Varroa60% V 300 bees varroa300%  oregano 7.5 5.0 5.93 4.45
446.1 21.1 3.8 5.8 10% 13.5 5%  fumagilina 7.4 4.5 6.18 4.35 418.1 32.7 2.9
1.6 3% 7.3 2%
FB frames with bees
s sampled (10%)
pop whole population
V varroa
V60 varroa sampled out of 60 frozen bees
V300 varroa sugar shaked out of 300 bees

-- 
Juanse Barros J.
APIZUR S.A.
Carrera 695
Gorbea - CHILE
+56-45-271693
08-3613310
http://apiaraucania.blogspot.com/
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