Table 2. Races of Puccinia triticina in the U.S. in 2004 determined by virulence to 16 near-isogenic lines of Thatcher wheat with leaf rust-resistance genes. Area 1 includes the U.S. states of AL, AR, FL, GA, LA, MS, NC, and SC; Area 2, DE, MD, NJ, NY, PA, VA, and WV; Area 3, IL, IN, KY, MI, MO, OH, TN, and WI; Area 4, NM, OK, and TX; Area 5, CO, IA, KS, and NE; Area 6, MN, MT, ND, SD, and WY; Area 7, CA, and UT; and Area 8, ID, OR, and WA (See Figure 2). Differentials used: 1,2a,2c,3,9,16,24,26,3ka,11,17,30,B,10,14a,18. An * indicates less than 0.6 %.

 Race  Virulence combination (inneffective Lr genes)  Area 1  Area 2  Area 3  Area 4  Area 5  Area 6  Area 7  Area 8  U.S. Total
 #  %  #  %  #  %  #  %  #  %  #  %  #  %  #  %  #  %
 BBBD  14a 0 0 0 0 0 0 0 0 2 1 0 0 0 0 0 0 2 0.3
 BBBG  10 0 0 0 0 0 0 0 0 0 0 0 0 0 0 2 17 2 0.3
 CBBG  3,10 1 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 0.1
 CLDS  3,9,17,B,10,14a 0 0 0 0 0 0 2 1 1 1 0 0 0 0 0 0 3 0.4
 KBBG  2a,2c,3,10 0 0 0 0 1 2 6 3 5 3 63 26 0 0 1 8 76 10.0
 KBBJ  2a,2c,3,10,14a 0 0 0 0 0 0 4 2 4 2 9 4 0 0 0 0 17 2.2
 KCBJ  2a,2c,3,26,10,14a 0 0 0 0 0 0 0 0 2 1 0 0 0 0 0 0 2 0.3
 KDBG  2a,2c,3,24,10 0 0 0 0 0 0 8 5 4 2 2 1 0 0 0 0 14 1.8
 KDBJ  2a,2c,3,24,10,14a 0 0 0 0 0 0 0 0 0 4 2 0 0 0 0 0 4 0.5
 KDDG  2a,2c,3,24,17,10 0 0 0 0 0 0 4 2 0 0 0 0 0 0 0 0 4 0.5
 KDDJ  2a,2c,3,24,17,10,14a 0 0 0 0 0 0 4 2 0 0 0 0 0 0 0 0 4 0.5
 KFBJ  2a,2c,3,24,26,10,14a 0 0 0 0 0 0 0 0 3 2 0 0 0 0 0 0 3 0.4
 KGBG  2a,2c,3,16,10 0 0 0 0 1 2 0 0 2 1 11 5 0 0 0 0 14 1.8
 KGBJ  2a,2c,3,16,10,14a 0 0 0 0 0 0 0 0 3 1 8 3 0 0 0 0 11 1.4
 KJBJ  2a,2c,3,16,24,10,14a 0 0 0 0 1 2 0 0 0 0 0 0 0 0 0 0 1 0.1
 MBDS  1,3,17,B,10,14a 7 7 1 7 5 12 32 18 16 9 15 6 0 0 3 25 79 10.4
 MBGJ  1,3,11,10,14a 2 2 0 0 4 10 0 0 0 0 0 0 0 0 0 0 6 0.8
 MBRJ  1,3,3ka,11,30,10,14a 0 0 0 0 0 0 0 0 1 1 1 * 0 0 0 0 2 0.3
 MBRK  1,3,3ka,11,30,10,14a,18 2 2 0 0 1 2 2 1 0 0 0 0 0 0 0 0 5 0.7
 MCDS  1,3,26,17,B,10,14a 3 3 4 29 21 50 16 9 21 12 32 13 2 67 3 25 102 13.4
 MCRK  1,3,26,3ka,11,30,10,14a,18 29 29 3 21 2 5 0 0 2 1 0 0 0 0 0 0 36 4.7
 MDBJ  1,3,24,10,14a 1 1 0 0 0 0 5 3 2 1 2 1 0 0 0 0 10 1.3
 MDDS  1,3,24,17,B,10,14a 0 0 0 0 0 0 0 0 2 1 0 0 0 0 0 0 2 0.3
 MFBJ  1,3,24,26,10,14a 0 0 0 0 2 5 0 0 0 0 0 0 0 0 0 0 2 0.3
 MFDS  1,3,24,26,17,B,10,14a 2 2 0 0 0 0 0 0 0 0 0 0 0 0 0 0 2 0.3
 MHDS  1,3,9,16,26,17,B,10,14a 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 8 1 0.1
 MLDS  1,3,9,17,B,10,14a 0 0 0 0 0 0 13 7 3 2 2 1 0 0 0 0 18 2.4
 SBDD  1,2a,2c,17,14a 0 0 0 0 0 0 0 0 0 0 0 * 0 0 0 0 1 0.1
 TBBF  1,2a,2c,3,14a,18 0 0 0 0 1 2 0 0 0 0 0 0 0 0 0 0 1 0.1
 TBBG  1,2a,2c,3,10 0 0 0 0 0 0 2 1 0 0 2 1 0 0 2 17 6 0.9
 TBBJ  1,2a,2c,3,10,14a 8 8 0 0 0 0 16 9 15 9 7 3 0 0 0 0 46 6.0
 TBDS  1,2a,2c,3,17,B,10,14a 2 2 0 0 0 0 5 3 21 12 17 7 0 0 0 0 45 5.9
 TBRJ  1,2a,2c,3,3ka,11,30,10,14a 0 0 0 0 0 0 3 2 0 0 0 0 0 0 0 0 3 0.4
 TBTJ  1,2a,2c,3,3ka,11,17,30,10,14a 0 0 0 0 0 0 0 0 0 0 2 1 0 0 0 0 2 0.3
 TCBJ  1,2a,2c,3,26,10,14a 0 0 2 14 0 0 0 0 10 6 0 0 0 0 0 0 12 1.6
 TCDS  1,2a,2c,3,26,17,B,10,14a 4 4 4 29 2 5 0 0 28 16 13 5 0 0 0 0 51 6.7
 TCGJ  1,2a,2c,3,26,11,10,14a 7 7 0 0 0 0 0 0 0 0 0 0 0 0 0 0 7 0.9
 TCRK  1,2a,2c,3,26,3ka,11,30,10,14a,18 4 4 0 0 0 0 0 0 0 0 0 0 0 0 0 0 4 0.5
 TCTB  1,2a,2c,3,26,3ka,11,17,30 2 2 0 0 0 0 0 0 0 0 0 0 0 0 0 0 2 0.3
 TCTD  1,2a,2c,3,26,3ka,11,17,30,14a 4 4 0 0 0 0 0 0 0 0 0 0 0 0 0 0 4 0.5
 TCTG  1,2a,2c,3,26,3ka,11,17,30,10 3 3 0 0 0 0 0 0 0 0 0 0 0 0 0 0 3 0.4
 TDBJ  1,2a,2c,3,24,10,14a 0 0 0 0 0 0 6 3 1 1 0 0 0 0 0 0 7 0.9
 TDDS  1,2a,2c,3,24,17,B,10,14a 0 0 0 0 0 0 1 1 0 0 0 0 0 0 0 0 1 0.1
 TGBJ  1,2a,2c,3,16,10,14a 1 1 0 0 0 0 0 0 0 0 3 2 0 0 0 0 6 0.8
 THBJ  1,2a,2c,3,16,26,10,14a 2 2 0 0 0 0 8 5 3 2 17 7 0 0 0 0 30 3.9
 TJBJ  1,2a,2c,3,16,24,10,14a 0 0 0 0 0 0 0 0 0 0 2 1 0 0 0 0 2 0.3
 TLGJ  1,2a,2c,3,9,11,10,14a 10 10 0 0 1 2 6 3 0 0 2 1 0 0 0 0 19 2.5
 TLRJ   1,2a,2c,3,9,3ka,11,30,10,14a 0 0 0 0 0 0 2 1 0 0 0 0 0 0 0 0 2 0.3
 TNBJ  1,2a,2c,3,9,24,10,14a 2 2 0 0 0 0 0 0 4 2 2 1 1 33 0 0 9 1.2
 TNRJ  1,2a,2c,3,9,24,3ka,11,30,10,14a 5 5 0 0 0 0 32 18 13 8 27 11 0 0 0 0 77 10.1
 Total   101   14   42   177   172   242   3   12   763