10 



BULLETIN 629, D 



DEPARTMENT OF AGEICULTrEE. 



Table I. — Summary of notes on the rust resistance of oat varieties tested in the 



greenhouse at Cornell University, Ithaca, X. Y.. 1915-16 — Continued. 



[R.= resistant: S.= susceptible.] 





Identification numbers. 



Crown rust. 



Stem rust. 







= '3 1 



-/. 





— 



•h 



1 <3 





Variety. 



- — r -.' 



^ 





= 6 



- - 



. 



~ = 



Remarks. 





o x.~ 



£ 



S-i 



< 



= 



3 



S3 

 = .E 



I 



— 



= = 







~ 



- 



X. "= 







- — 





1 



■2 ?, 



4 



5 



6 



7 



8 



9 10 





Common (sativa) varieties — 

















Continued. 



















Scottish Chief 



92 1793 

 107 1811 

 71 









S. 



s. 



s. 

 s. 



I: 



8. 



S. 

 S. 



S. 



s. 



S. 

 S. 



S. 

 S. 

 8. 



8. 

 8. 

 S. 



= 



8. 

 S. 



S. 















Shadeland Challenge 



Sbadpland ClimaT 



e>v) 









72i 



681 









Shirefl 



12 

 13 

 3 







286 

 261 



8. 

 s. 

 s. 















RiTrv-D^v(\finn ) 























S. 



s. 



= 



s 







99 

 87 

 6 



If . 

 1726 









8. 

 S. 



S. 



s. 



S. 



s. 



s. 

 s. 

 s. 



S. 



s. 



s. 



s. 



s. 



i T s.? 



S. 

 8. 



- 



- 



- 



•s S.? 



S. 



"r" 



m s.? ; 



Stube 









s. 

 s. 



s. 



s. 



R. 



IBS.? 



s. 

 s. 



8. 











271 

 403 

 301 







44 

 1^ 

 5 



101 



1" 

 61 











White Russian 









White Tartarian (check) . 











1VJ3 



















299 



• 









605 

 609 







Do 



117 



25259 





... 





Avena sativa (botanical 





















races): 























120 

 265 

 266 



_ " 

 274 





2-5356 





s. 

 s. 



S. 



- 



19 S.? 



s. 

 s. 

 s. 

 s. 



S. 



8. 

 S. 

 S. 

 S. 

 8. 



s. 







s. 











B. 











s. 



S. 















A. s. setosa 



275 

 276 









»s.? 



S. 



s. 

 s. 



3. 

 8. 



s. 

 s. 





A. s. aristata 













277 







s. 



s. 



8. 



s. 





Do 



278 



279 

 2>0 







B. 



s. 

 s. 



s. 



S. 



s. 



- 



S. 

 S. 



s. 



8. 



s. 





Do 









Do 









Do 



281 





S. 



s. 



- 



S. 





Do 



282 





s. 



S. 



B. 



s. 





Do 



• 





s. 



-. 



8. 



s. 





Do 



84 





s. 



s. 



S. 



s. 





Do 







s. 



21 R.? 



B. 



s. 





Do 







s. 





- 



s. 





Do 







S. 



- 



8. 



s. 





Do 









s. 



s. 



S. 



s. 





Do 









B. 



s. 



S. 



s. 





Do 



290 

 ?91 







B. 



s. 



s. 

 s. 



s. 



8. 



s. 





A. s. praegravis 



Do 









292 

 293 







52 R.? 



s. 



s. 

 s. 



s. 



»R?+S. 

 8. 





Do 









m Normal uredinia in the usual time on one plant: on the other culm subepidermal uredinia, at first 

 small and surrounded by spots of purple color, but later rupturing the epidermis and attaining normal 

 size. 



u Uredinia usually numerous, but smalL Epidermis not always ruptured early; on some plants only 

 flecks with tiny uredinia were formed. 



•* Few uredinia. normal in size but accompanied by blotches of purple color, probably an anthocyanin, 

 similar in appearance to those commonly present on sorghum and maize plants. These blotches were 

 often observed adjacent to stem-rust uredinia and may indicate an unusual disturbance in the physiologic 

 activities of the host cells, whether or not they are directly related to the question of resistance. 



17 Light infection; uredinia few and of small size. 



u Light infection; uredinia tardy in appearing and never reaching normal size. 



is Normal infection on five leaves; light infection on two leaves. 



* Normal infection on six leaves, medium on two, and only a light infection on two. 



» Only a very few tiny uredinia, formed 14 days after inoculation. 



— No uredinia on leaves of first seedlings inoculated; the leaves appeared dry and dead within a few 

 days after inoculation. In the second series inoculated, only one leaf was severely infected. Eight showed 

 medium infection, and on one no uredinia appeared. 



a Normal infection on one plant; no indication of infection on the other. 



