Volume
2 Issue
10
July 26,
2005
Soybean Rust Update
http://www.sbrusa.net/
National Report
 The
first rust find in Mississipi in 2005 occurred from
soybean samples collected on July 13th from a sentinel
plot in George County. Three counties in Georgia have
reported rust. The lastest is Decatur County (on kudzu as
well as on soybean); Tift County, reported rust on
soybean, while the Seminole County find was on volunteer
soybeans which have since been destroyed. Eight counties
in Florida have now reported soybean rust on kudzu with
two reports from soybean. The newest report is from
soybean grown in a sentinel plot in Escambia County near
to some production fields. In Alabama, soybean rust has
now been reported on soybeans from a sentinel plot and a
commercial soybean field. This was the first report from a
commercial soybean field in 2005. Intensive scouting is
continuing wherever soybean is grown. It is expected that
more counties in the South will become positive with
soybean rust finds over the next week from spore
deposition from prior storms.
Minnesota Report by Jim Kurle
Leaf spotting diseases, both bacterial blight and Septoria
leaf spot, have been observed in many soybean fields.
Growth Stages
Statewide soybean plant development ranges from V5 to R3.
Sentinel plots range from V6 in Central Minnesota to the
R3 Stage in southern counties with the majority of plots
at R1-R2.
Management
No management actions for controlling soybean rust are
necessary at this time. Fungicide applications for control
of soybean rust are not necessary.
Forecast Outlook
The risk of soybean rust in MN is currently extremely low.
In areas where soybean rust has been found weather has
been favorable for further disease development. However,
weather has generally been unfavorable for transport of
spores to Minnesota from areas where infection is
currently present AL, GA, FL, and MS.
Scouting Recommendations
Scouting for soybean rust in areas other than in sentinel
plots is not necessary at this time.
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