Table 1: List of 20 North American stem rust differentials.

Differentials (set, line)Sr - gene

I
 ISr5-Ra5
 Cns-T -mono-deriv21
 Vernstein9e
 ISr7b - Ra7b
II
 ISr-11-Ra11
 ISr6- Ra6
 ISr8-Ra8a
 CnSr9g9g
III
 W2691SrTt-136
 W2691Sr9b9b
 BtSr30Wst30
 Combination VII13 +17
IV
 ISr9a-Ra9a
 ISr9d-Ra9d
 W2691Sr1010
 CnsSrTmpTmp
V
 LeSr24Ag24
 Sr31/6LMPG31
 VPM138
 McNair701McN

Sources. Kulumsa Agricultural Research Center (KARC).