That was Purdue MBB stockMakes me think of the utube with the bees virtually pouncing on the mite. Never clear if that was a mite from a different hive or the host hive.
SARE grant on them https://projects.sare.org/project-reports/fne15-819/
The next year follow up foundThe 2015 season was marked regionally with substantial Fall losses due to being overwhelmed by mites; the MBB bees stole the remaining honey from collapsing neighboring hives, and also brought back hitchhiker mites with them, and guard bees groomed them off, killed them, and left them in piles next to the entrance.
I found it interesting The in the same general area as COMB they took about the same losses with the unslect stockWinter survival for the Purdue MBB bees was 50% vs. the Control of 36%, or a mortality rate of 50% vs. 74%. Table 1 SARE-Winter-Survivorship-2017
While statistically not significant, the differences in weight and mite load at certain times in the Fall is worthy of more exploration
And we see the same in FNE17-863 https://projects.sare.org/project-reports/fne17-863/
This puts small cell firmly to bed for meMBB had 21 out of 30 survive (70%), feral colonies had 10 out of 16 survive (62.5%), and the control had 6 out of 18 survive (33.3% ).
but a key point hereGroup 1-MBB colonies, bees that chew mites, were significantly heavier than the Group-3-control group. Also, Group 2-feral bees, were similar to the control group. Statistics proved a positive correlation between MBB and hive weight; the more chewed mites, the higher the weight. The average weights were: Group 1 – 132 pounds, Group 2 – 85 pounds, and Group 3 – 97 pounds.
Large swarm losses=strong selection pressure on ferals above and beyond overwintering leads to better survival ratesWe set out over 28 swarm traps, and visited them 516 times, and collected 56 swarms, of which 17 were established in colonies for the study. Note: Most locations captured between 0 and 4, Ohio skews the numbers by reporting 42. Many swarms were destroyed by bears while still in the trap before they could be transferred, and many small ones failed to establish.