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2007 Overview of Soybean Rust in North America
(United States & Canada)
Carl A. BradleyDepartment of Crop Sciences
University of [email protected]
Outline
• Rust in the U.S. and Canada in 2007
• Comparison of 2005, 2006, and 2007
• Response to rust in 2007 – fungicide applications
• Summary
Soybean Rust in 2007
January 9, 2007Alabama Florida
January 16, 2007Alabama Florida Georgia
February 20, 2007Alabama Florida Georgia Texas
March 6, 2007Alabama Florida Georgia Texas
April 2007 – Cold Temperatures
May 1, 2007Alabama Florida Georgia Texas
May 8, 2007Alabama Florida Georgia Texas Louisiana
June 5, 2007Alabama Florida Georgia TexasLouisiana
June 27, 2007AlabamaFlorida Georgia Texas Louisiana
July 17, 2007Alabama Florida Georgia Texas Louisiana Mississippi
July 31, 2007Alabama Florida Georgia Texas Louisiana Mississippi Oklahoma Arkansas
August 14, 2007Alabama Florida GeorgiaTexas Louisiana Mississippi Oklahoma Arkansas
September 25, 2007Alabama Florida Georgia Texas Louisiana Mississippi Oklahoma Arkansas Missouri South Carolina Kentucky Kansas
October 2, 2007Alabama Florida Georgia Texas Louisiana Mississippi Oklahoma Arkansas Missouri South Carolina Kentucky Kansas Illinois Iowa
October 9, 2007Alabama Florida Georgia Texas Louisiana Mississippi Oklahoma Arkansas Missouri South Carolina Kentucky Kansas Illinois Iowa Nebraska Tennessee
October 16, 2007Alabama Florida Georgia Texas Louisiana Mississippi Oklahoma Arkansas Missouri South Carolina Kentucky Kansas Illinois Iowa Nebraska Tennessee North Carolina
October 23, 2007Alabama Florida Georgia Texas Louisiana Mississippi Oklahoma Arkansas Missouri South Carolina Kentucky Kansas Illinois Iowa Nebraska Tennessee North Carolina Indiana
October 30, 2007Alabama Florida Georgia Texas Louisiana Mississippi Oklahoma Arkansas Missouri South Carolina Kentucky Kansas Illinois Iowa Nebraska Tennessee North Carolina Indiana Virginia
November 16, 2007Alabama Florida Georgia Texas Louisiana Mississippi Oklahoma Arkansas Missouri South Carolina Kentucky Kansas Illinois Iowa Nebraska Tennessee North Carolina Indiana Virginia Ontario
Number of counties by state in 2007
0
5
10
15
20
25
30
35
40
AL AR FL GA IL IN IA KS KY LS MS MO NE NC OK SC TN TX VI
Total = 301 counties
Comparison of 2005, 2006, & 2007 for U.S.
8 15 19
131
274301
0
50
100
150
200
250
300
350
2005 2006 2007
No. statesNo. counties
No. of positive counties by month
0
20
40
60
80
100
120
140
160
180
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov
200520062007
Response to rust – fungicide applications
• Fungicides were applied to soybean in the U.S. to manage soybean rust in 2007
• How many soybean acres were sprayed?– Giesler and Hershman survey – estimate of 1.34
million acres in the U.S.
States with soybean rust or adjacent to states with soybean rust at a time when crop was susceptible to yield loss (prior to R6)
B. KemeraitE. SikoraT. Allen C. HollierJ. MaroisS. MonfortJ. Mueller T. IsakeitD. Jardine
15,000 (0.5%)
20,000 (25%)
550,000 (85%)
200,000 (7%)
62,500 (5%) 250,000 (75%)
1,250 (25%)
25,000 (15%)198,000 (44%)
Summary of 2007
• Found in a total of 19 states in U.S. (most yet)– Iowa, Kansas, Nebraska, and Oklahoma – 1st finds
• Found in a total of 301 counties in 2007 (most)
• First find in Canada (Ontario)
• Northernmost find to date came in 2007:– Hancock C0unty, Iowa
Summary of 2007
• Weather factors were very important
Thank you!
