I asked Lilia de Guzman at the Baton Rouge bee lab for her opinion on 
the topic of the apparent disappearance of tracheal mites.  She sent me 
this table used in a talk at the Entomological Society of America in 
2019, mostly from colonies in Louisiana, but a few other states.  It 
confirms my earlier statement that by the mid 2000s they were hard to 
find at high levels.  She also included a summary table of data over 
the last 10 years from Oregon (30 colonies each year).  There the 
disappearance happened around 2017.  She points out that A. dorsalis is 
still around and more common.....

I suspect there is still a lot of susceptibility in US bees to A. woodi.  
Hawaii shipped hundreds of thousands of queens yearly to the mainland 
and those bees were demonstrably on the susceptible side.  I believe 
someone (Bill Wilson et al.?) showed early on that Amitraz is effective 
against tracheal mites and even the first incarnation (Miticur) was 
possibly marketed as not only controlling varroa but also tracheal 
mites.

Cottonwood Creek Apiaries
P. O. Box 1032
Crestone, CO 81131
719 256 4010

             ***********************************************
The BEE-L mailing list is powered by L-Soft's renowned
LISTSERV(R) list management software.  For more information, go to:
http://www.lsoft.com/LISTSERV-powered.html