Re: Treatment-Free Bungling 2018 - ?
As usual, good stuff!
one of the reasons it has fallen by the wayside as a method, daily count can swing up or down by a factor of 2
2. There does not appear to be a linear correlation between time and number of mite drops
Amazingly, #1910 still shows no outward signs of mite stress and these evaluations underscore for me the complex interaction between tolerance and resistance.
Arguably #1910 exhibits both the highest percentage of mite damage and the most significant damage on the mites themselves but they continue to have high mite drops two evaluations in a row.
2nd issue with NMF is you have to compare apples to apples... same pop size, same amount of brood, etc. it doesn't give you a % witch makes hive to hive comparison
3rd issue is it measures mites on the floor, not mites on the bees. #1910 as an example. They are biters, the grooming may be knocking off a high number of undamaged mites giving you more on the sticky board and less on the bees compared to the other hives, so there mite load could be lower as the mites may be ending up on the board
Your doing a lot of work to record you data. I would offer the suggestion to collect better data, a shake or wash.. wash prefered, but I get why some don't like it.
it would be particularly interesting to know the wash numbers of #1910 as that would tell you weather or not they indeed have tolerance (living with a high mite load) or resistance (keeping the mite load down). That knowledge will help you with breeding choices
"oh well, let us stick to science. let them have their beliefs and intuitions!" -Medhat Nasr