Table 3. Virulence frequencies (%) of Puccinia triticina in the U.S. in 2004 to 16 differential 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).
 Resistance gene  Area 1  Area 2  Area 3  Area 4  Area 5  Area 6  Area 7  Area 8  U.S. Total
 #  %  #  %  #  %  #  %  #  %  #  %  #  %  #  %  #  %
 Lr1  100  99.0  14  100.0  39  92.9  149  84.2  142  82.6  149  61.6  3  100.0  9  75.0  605  79.3
 Lr2a 54 53.5 6 42.9 7 16.7 107 60.5 122 70.9 190 78.5 1 33.3 3 25.0 490 94.2
 Lr2c 54 53.5 6 42.9 7 16.7 107 60.5 122 70.9 190 78.5 1 33.3 3 25.0 490 94.2
 Lr3 101 100.0 14 100.0 42 100.0 177  100.0 170 98.8 241 99.6 3 100.0 10 83.3 758 99.3
 Lr9 17 16.8 0 0.0 1 2.4 55 31.1 21 12.2 33 13.6 1 33.3 0 0.0 128 16.8
 Lr16 3 3.0 0 0.0 2 4.8 8 4.7 8 4.7 43 17.8 0 0.0 1 8.3 65 8.5
 Lr24 10 9.9 0 0.0 3 7.1 60 33.9 33 19.2 35 14.5 1 33.3 0 0.0 142 18.6
 Lr26 60 59.4 13 92.9 27 64.3 24 13.6 69 40.1 62 25.6 2 66.7 4 33.3 261 34.2
 Lr3ka 49 48.5 3 21.4 3 7.1 39 22.0 16 9.3 30 12.4 0 0.0 0 0.0 140 18.3
 Lr11 68 67.3 3 21.4 8 19.0 45 25.4 16 9.3 32 13.2 0 0.0 0 0.0 172 22.5
 Lr17 27 26.7 9 64.3 28 66.7 77 43.5 92 53.5 82 33.9 2 66.7 7 58.3 324 42.5
 Lr30 49 48.5 3 21.4 3 7.1 39 22.0 16 9.3 30 12.4 0 0.0 0 0.0 140 18.3
 LrB 18 17.8 9 64.3 28 66.7 69 39.0 92 53.5 79 32.6 2 66.7 7 58.3 304 39.8
 Lr10 95 94.1 14 100.0 41 97.6 177 100.0 170 98.8 241 99.6 3 100.0 12 100.0 753 98.7
 Lr14a 95 94.1 14 100.0 40 95.2 157 88.7 161 93.6 164 67.8 3 100.0 7 58.3 641 84.0
 Lr18 35 34.7 3 21.4 4 9.5 2 1.1 2 1.2 0 0.0 0 0.0 0 0.0 46 6.0
 Total 101   14   42   177   172   242   3   12   763