74 EVA FUCHS 



Table 6. Seedling reaction of wheat variety Vilmorin 23 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 



0+ 



IV 



IV 



0-IV 







1 



IV 



IV 



IV 



IV 



IV 



54 







IV 



IV 



0+ 







42A 







0+ 



0+ 



0+ 







20A 







0+ 







0+ 







27/53 











0+ 











2 



IV 



IV 



IV 



IV 



IV 



3/55 



IV 



IV 



IV 



IV 



IV 



32A 



11+ 



II-IV 



II-IV 



II-IV 



0-IV 



32 



11+ 



II-IV 



II-IV 



0-IV 



0+ 



26 











0-IV 



-- 







7 







II 



0+ 



-- 







15 











0-IV 











Indicates the combined results of thousands of greenhouse tests. 

 Temperature in degrees C/photoperiod in hours; light intensity in 



lux. 



c 



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



With Lee (Table 7) the clear cut differences of the greenhouse 

 disappeared nearly everywhere. 



Spaldings prolific (Table 8) was known to be a rather bad differ- 

 ential, but if the reaction observed was exactly resistant (as with races 

 1, 42A, 20A) or if it was exactly susceptible (as with races 2, 26, 15) 

 the variety was useful. This differential exhibited little variation 

 under the conditions of this experiment. 



