Initially, a total of 35 states within the United States and five Canadian
provinces established soybean sentinel plots for SBR monitoring
in 2005. Since 2004, SBR has been reported from 20 states
and as far north as Ontario, Canada. SBR has been monitored on a
near-daily basis since 2005 through the use of over 4,500 sentinel
plots. These data are analyzed and used to create maps and inputs
for the models described above to predict where and when SBR is
most likely to develop in North America. The number of sentinel
plots (soybean and other hosts) in North America peaked at 984 in
2008, and has gradually declined to 285 in 2012. The decline is in
part due to reduced funding for monitoring efforts across the
United States, particularly in northern states where the disease has
not been a significant problem to date