14 



BULLETIN 1046, U. S. DEPAETMEISTT OF AGEICULTUEE. 



Table 2. — Stem-rust infection on susceptible and resistant varieties of wheat grown in the 

 rust nursery at Manhattan, Kans., in 1916 and 1917 . 







1916 







Identification. 



Name. 



Class. 





PI. VI, 

 fig. 1. 



Pedigree or 



other 

 number. 



Rust in- 

 fection. 



A 



P758 ' 



Hard red winter 



Per cent. 

 65 



B 



P759 ' ... _ _ _ . 



do. ... 



40 



C 



P762 



P771 



P772 



P773 



P1038 



P1064 



P1066 



P1088 



P1071 



P1078 



P1036 



Kanred 







.....do 



10 



D 



do 



45 



E 



do 



50 



F 



do 



55 



G.. 



do 



85 



H 



do......... 



60 



I....... 



do 



5 



J 



do 



5 



K 



do 



45 



L 



do 



50 



M 



.....do 





N 



Check 



C.I. 1517.. 

 C. I. 3322.. 

 P721 



Turkey 



Ghirka 



do 



45 



O .. 



Hard red spring. 



50 



P 



D-5 



Red durum 





Q 





Hard red winter 



30 



R 





Mealy. . 



Soft red winter. 



85 

















1917 







A 



P758 





Hard red winter 



95 



B 



P759 





do 



70 



C 



D...... 



P762 



P765 



Kanred 



do 



do 



Trace. 

 90 



E.. 



P877 





....do . 



70 



F 



P1038 





...do 



85 



O 



P1064 





do ; 



70 



H 



P1086 





do 



5 



I 



P1068 





. ..do 



5 



J 



P1078 





do 



85 



K 



L 



M 



N 



Kans. 2048. 

 Minn. 169.. 

 C. 1.2094.. 

 P721 



Alberta Red 



Haynes Bluestem 



Kubanka 



do 



Hard red spring 



Durum 



Hard red winter : 



88 

 85 

 10 

 40 



. .. 



C. I. 3277. 





Soft red winter 



95 







. 







GREENHOUSE EXPERIMENTS. 



To check the nursery results similar experiments under controlled 

 conditions were conducted in the greenhouse. 



INOCULATION METHODS. 



Nearly all the varieties, both winter and spring, which were used 

 in the field were inoculated in the seedling and heading stages in the 

 greenhouse. Careful records of the inoculated plants of each variety 

 have been kept and their behavior compared with the behavior of 

 the same variety in the field. The number of plants which can be 

 grown under greenhouse conditions is more or less limited, and for 

 this reason conclusions from such experiments should always be 

 drawn with caution. 



INOCULATION OF SEEDLINGS. 



In inoculating seedlings the first leaf was inoculated and all others 

 were trimmed off. The uredinial material came from stock cultures 

 grown on Improved Turkey (Kansas No. 2382), or some other sus- 



