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Crop Growth Stage Last Modified: 08/27/09 01:38 PM
Sentinel plots across the state have reached the reproductive growth stages with most of them in late-R6.

Producer bean growth stages range from V4 through R8 depending upon geographic location within MS. Generally speaking, soybean growth stages are younger in the southern parts of the state and northwestern and northeastern counties.

Observation and Outlook - Disease Last Modified: 08/27/09 01:38 PM
NEWEST COMMENTARY FIRST:
On August 26, 2009 soybean rust was detected at low levels in a commercial soybean field in Tunica County. Soybeans were in the R6 growth stages and not quite to R7 at the time.

August 23, 2009 COMMENTARY: On Friday, Saturday and Sunday (August 21-23) soybean rust was detected at low levels in commercial soybeans in Quitman, Tallahatchie, Calhoun, and Coahoma counties on soybeans in the R7-R8 growth stages.

OLD COMMENTARY: On Thursday, August 13, 2009, soybean rust was detected in a commercial soybean field just west of Stoneville/Leland. The soybeans were at the R7 growth stage. Levels of rust within the field were low. The soybean field had NOT received an R3/R4 fungicide application.

On Friday, August 14, 2009 soybean rust was detected in commercial soybean fields in Carroll, Grenada, Humphreys, Leflore, Montgomery, Sunflower, Yalobusha, and Yazoo counties. Rust levels were EXTREMELY LOW in all of the fields save for one field in Montgomery County, immediately east of Winona, MS. ALL soybean fiels were beyond R5.7 so they are out of the woods and would NOT require treatment.

OLD COMMENTARY: Yesterday soybean rust was detected in a commercial soybean field in Holmes County near Thornton, MS. This is the first detection of rust in MS and the furthest north that rust has been detected in the U.S. to date.

Observation and Outlook - Insect Last Modified: N/A
Commentary Not Available

Scouting and Management - Disease Last Modified: 08/27/09 01:38 PM
NO management suggestion at present time simply due to the stage of the soybeans within each of the fields where rust was detected as well as the extremely low levels of rust detected. However, for the specific managemant scnearios please refer to the attached document below (August 21, 2009 soybean rust treatment scenarios). The only change that should be noted on the document is simply the overall NUMBER of counties where rust has been detected which should be 19 at this point. For the most current information refer to the soybean rust hotline, 1-866-641-1847, for any changes or additional information as it becomes available.

If you have questions about your particular growth stage or anything else please feel free to call.

Scouting and Management - Insect Last Modified: N/A
Commentary Not Available


Plant Pathologist
Tom Allen
Associate Extension/Research Professor
Mississippi State University
Phone:(662) 402-9995
Email:tallen@drec.msstate.edu