I am starting this thread as an off-shoot to the discussion on yesterday's thread by Mike Gilmore about using a single dose of OAV as a mite monitoring tool. See here: https://www.beesource.com/forums/show...onitoring-tool
Although I am somewhat skeptical of using OAV as a monitoring tool, I am always keen to learn new things. So I have been mulling over the idea.
BeeArthur has done a lot of work on a very interesting mite calculator tool that uses the mite drop at 24 hours after an OAV treatment. See here: www.mitecalculator.com
This morning's discussion caught my eye because there was mention of a differing pattern of when the maximum mite drop occurs relative to the treatment. I rarely see anything in the first 24 hours, indeed it's usually not until late in the second day or the even the third day that all the dead mites seem to appear on my sticky boards. Yet other users are reporting seeing results much sooner.
I am wondering what factors make a difference in that.
Is it dose-dependent, differing OAV equipment, time of year, proximity of the bees to the treatment point, type of monitoring surface, outside air temps?
Since I have relatively delayed drop (and other people have also reported that, IIRC) assessing the number of killed mites at 24 hours would lead me to incorrectly assume I had low numbers of mites if I used that point post-treatment as my reference.
So, if you've got ideas about this, will you add them?
I am interested in these factors (please feel free to suggest others)
a) do you use a sticky board or tray under a screened floor or are you observing dead mites on the solid floor of a hive.
b) what type of sublimation (not fogging) equipment used
c) dose given in total grams
d) kind of OA: official stuff from bee suppliers, Savogran Wood Bleach, or chemical supply source
d) size (8- or 10- frame and medium or deep) and number of boxes in stack at treatment
e) position of most bees in the colony at time of treatment
f) point of delivery, i.e. top or bottom
g) estimated amount of brood
h) time of day (i.e. most bees inside during treatment, or many foraging outside)
i) outside air temps
j) what is the pattern that you observe in mite-drops after treatment: at 12/24/36/ or more hours?
As it happens I am about to start a four dose/5-day interval OAV series on Monday or Tuesday on all my colonies. (Missed my broodless one-shot late last year due to illness, and a much-delayed treatment obviously missed the broodless period too, alas.) So I will have data to share starting Tuesday/Wednesday. Is anybody else running a OAV series now?
Anecdotal info to the above is OK, too, if you are not treating right now. Especially as it may help clarify/amplify the factors listed, which could then be made into a survey and left out to collect data for longer period when more beekeepers are likely to be using OAV.