The latest Prairie wind trajectory cereal rust risk report is available for download now at the following link: May 12-20, 2021 report.
As of May 20, 2021 the overall Prairie cereal rust risk assessment and need for in-crop scouting is as follows:
Pacific Northwest – Even though
there were a number of reverse wind trajectories that passed over the PNW
region and into the prairies, given limited stripe rust development in the PNW,
generally dry Prairie weather conditions during the week of May 10-16, 2021,
and early stages of Prairie crop development, as of May 20, 2021 the risk of stripe rust appearance from the PNW is
limited and scouting for this disease is generally not urgent.
Texas-Oklahoma corridor – Given
limited leaf and stripe rust development in this corridor (especially Texas), a
smaller number of recent wind trajectories from this area, generally dry Prairie
weather conditions, and early stages of Prairie crop development, as of May 20, 2021 the risk of leaf and
stripe rust appearance from the Texas-Nebraska corridor is low and scouting for
these diseases is not urgent.
Kansas-Nebraska corridor – Stripe
rust is continuing to develop in Kansas, and is progressing in Nebraska, while
there were limited to no recent wind trajectories from this area into the central
to western Prairie region. However,
there have been a number of trajectories that have passed over the central to
eastern Prairie region. Overall Prairie
weather conditions have been dry during the period of May 10-16, 2021, and
generally dry in Saskatchewan and Manitoba from April 17-May 16, 2021. Prairie spring wheat development is still early,
while winter cereals continue to develop.
As of May 20, 2021 the risk of leaf
and stripe rust appearance from the Kansas-Nebraska corridor is low for the
central to western Prairie region and moderate (mainly for stripe rust) for the
central to eastern Prairie region.
Scouting for these diseases in winter wheat fields is recommended over
the next 1-2 weeks, especially those planted to stripe rust susceptible
varieties.
Recent reports of stripe rust in
Minnesota and Illinois suggest more northerly development of this disease and
as a consequence growers in the central to eastern Prairie region should be on
the look out for stripe rust over the next couple of weeks, especially in
fields planted to susceptible winter wheat varieties.