72 



EVA FUCHS 



The behaviour of the differential Chinese 166 (Table 4) is rather 

 clear cut as shown by the Lit. column. The reaction is either resistant 

 (i-0) or susceptible (II-IV). However, there is some uncertainty (O-IV) 

 under growth chamber conditions in the higher temperature profile (22) 

 for race 27/53. 



Table 4. Seedling reaction of wheat variety Chinese 166 to 

 13 races of stripe rust under differing environmental 

 conditions 



■ 









Conditions 







Race 



Lit. 3 



22/16 b 

 3000 



22/16 b 

 1000 



17/13 b 

 3000 



Green j 

 house 



60 



IV 



IV- 



O-IV 



IV 



IV 



1 



i-0 



i-0 



i-0 



i-0 



1 



54 







i-0 



i-0 



i-0 



,-0 



42A 



IV 



IV 



IV 



IV 



J 



20A 







i-0 



i-0 



i-0 



i-0 



27/53 



II-IV 



O-IV 



O-II 



IV- 



i 

 IV- 



2 



i-0 



i-0 



i-0 



i-0 



i-0 



3/55 



i-0 



i-0 



i-0 



i-0 



i-0 



32A 



i-0 



i-0 



i-0 



i-0 



i-0 



32 



i-0 



i-0 



i-0 



i-0 



* 

 i-0 



26 



i-0 



i-0 



i-0 



i-0 



i-0 



7 



i-0 



i-0 



i-0 



i-0 



i-0 



15 



i-0 



i-0 



i-0 



i-0 



i-0 



Indicates the combined results of thousands of greenhouse tests 



as reported in the literature 



in lux 

 c 



Temperatures in degrees C/photoperiod in hours; light intensity 

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



Heines Kolben (Table 5) is a good main differential variety, so that 

 the mesothetic type reaction (II±) should be trusted. It is possibly the 

 best example of a good'differential I could show you now. The develop- 

 ment of the uncertain reaction (O-IV) should be noted for race 42A. 



