RACE DIFFERENTIATION IN CEREAL RUSTS 73 



Table 5. Seedling reaction of wheat variety Heines Kolben to 

 13 races of stripe rust under differing environmental 

 conditions 









Conditions 







Race 



Lit. a 



22/16 b 

 3000 



22/16 b 

 1000 



17/13 b 

 3000 



Green- 

 house 



60 



IV 



IV 



IV 



IV 



IV 



1 



IV 



IV 



IV 



IV 



IV 



54 



IV 



IV 



IV 



IV 



IV 



42A 



11+ 



O-II 



0-IV 



O-II 



0-IV 



20A 



11+ 



0+ 



0-IV 



O-II 







27/53 























2 



















i-0 



3/35 



















i-0 



32A 























32 























26 























7 



















i-0 



15 























Indicates the combined results of thousands of greenhouse tests. 



Temperature in degrees C/photoperiod in hours; light intensity 

 in lux. 



Temperature 17°C±2°; light intensity 4000 up to 14,000 lux. 



Vilmorin 23 (Table 6) used to be a very good differential with clear 

 cut for resistance, IV for susceptibility and 0+ to 11+ as a mesothetic 

 type with some races. As you can see, it didn't work through the growth 

 chambers (races 54, 60, 26, 7 and 15). But the mesothetic type reaction 

 for races 32 and 32A was valid through all conditions. 



