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Physiological specialization of Puccinia triticina on wheat in
the United States in 2010.
Jim Kolmer
Dave Long
Mark Hughes
USDA-ARS Cereal Disease Laboratory St. Paul MN
Puccinia triticina 2010 - USA
• 537 single uredinial isolates
• 40 virulence phenotypes total
• MLDS 30% (Lr9, Lr17, Lr39/41)• TDBJG 23% (Lr2a, Lr24) • TCRKG 13% (Lr2a, Lr26, Lr11, Lr18)
Virulence Phenotypes P. triticina 2010
Race Southeast
(52)
Northeast
(58)
Ohio Valley
(57)
TX-OK
(135)
KS-NE
(58)
MN-SD-ND
(149)
MCTSB 0% 16% 14% 0% 2% 0%
MFPSB 10% 0% 5% 7% 0 5%
MLDSD 39% 7% 2% 48% 21% 36%
TCRKG 23% 31% 56% 4% 0% 3%
TDBGG 0% 0% 0% 6% 9% 1%
TDBJG 14% 0% 14% 27% 38% 32%
Virulence P. triticina 2010
Gene
Southeast
(52)
Northeast
(58)
Ohio Valley
(57)
TX-OK
(135)
KS-NE
(58)
MN-SD-ND
(149)
Lr2a 42% 53% 75% 42% 78% 55%
Lr9 39% 19% 2% 50% 35% 38%
Lr16 0% 0% 0% 0% 0% 3%
Lr24 33% 16% 21% 42% 53% 54%
Lr26 39% 74% 79% 15% 9% 24%
Lr11 33% 78% 74% 7% 19% 4%
Lr17 52% 35% 26% 57% 36% 44%
Lr21 0% 0% 0% 0% 0% 8%
Lr39/41 39% 22% 2% 50% 35% 38%
Lr21 Virulence - 2010 Collections from MN-ND
Cultivar MLDSD TFBGG TFBJQ TFBGQ
TcLr21 2+3; ;2- 3+ 3+
Glenn 0; ; 2+n 22+n
Steele-ND 0; ; 2+3n 2
AC Cora ;2 ;2- 3+ 3+
Faller 0; ; 3+ 3+
RBO7 ;12- ; 3+ 3+
McKenzie ;1 ; 12+n ;2
Amidon ;1 ; 3+ 3+
Thatcher 3+ 3+ 3+ 3+
P. triticina SSR Groups 2010
• NA3 45% isolates
10 phenotypes• NA5 53% isolates
23 phenotypes• MLDSD- NA3• MFPSB- NA3• TDBJG - NA5• TDBGG- NA5• TCRKG- NA5
Top 10 Kansas Wheat Cvs 2011
• TAM 111- Lr17
• Fuller- Lr17,Lr39/41
• Art- Lr17+
• Postrock- Lr39/41
• Santa Fe- Lr3,Lr17
• TAM 112- Lr39/41
• Jagger - Lr17
• Armour - Lr39/41
• Overley - Lr39/41
• Blends
Whither Rust Pathology??Fungicide Effectiveness –
WLR-WStR
Headline Excellent
Quadris Excellent
Bumper Very good
Caramba Excellent
Folicur Excellent
Proline Very good
Propimax Very good
Prosaro Excellent
Tilt Very good
Quilt Excellent
Stratego Very good
Twinline Excellent
Moderate – High Rust pressure
$4-8 Wheat/bushel
$10-20 Fungicide/acre
Susceptible Wheat
Average >10% yield increase
>93% chance of economic return with fungicide application
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