RUST RESISTANCE OP OAT VARIETIES. 



11 



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

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



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





•Identification numbers. 



Crown rust. 



Stem rust. 





Variety. 



£ 



a 

 .d 



a 



o 



a 



o 



03 . 

 <a.J3 



3 



0> . 



Is d 



Ph 



02 



CO 



< 



a 



a 



a 



So 



a 



CO 



-6 



03 



£<& 



o3£ 



o.9 



03 ™ 



s 



to 



.g 



03 



■6 



03 



03 £ 

 +§ 60 



3 g 



03 H 



Remarks. 



1 



2 



3 



4 



5 



6 



7 



8 



9 



10 





Avena sativa (botanical 

 races) — Continued. 



294 

 297 

 298 

 299 

 301 

 302 

 303 



119 

 112 

 295 

 109 

 111 

 114 

 118 

 126 

 268 

 269 

 270 

 271 

 272 

 273 

 121 



116 



296 

 47 



li 











24 R.? 



S. 

 S. 



s. 

 s. 

 s. 

 s. 



27 S.? 



s. 



29 S_? 



25 R.? 



s. 

 s. 

 s. 

 s. 

 s. 



26 R.? 



28R.7+S. 



S. 



30 R.? 



S. 

 S. 

 S. 

 S. 

 S. 

 S. 

 S. 

 S. 

 S. 



s. 



33 R.? 



s. 



35 S.? 



s. 

 s. 



R. 



38 R. 



S. 

 S. 



s. 

 s. 

 s. 

 s. 

 s. 



s. 

 s. 

 s. 



s. 

 s. 

 s. 

 s. 

 s. 

 s. 

 s. 

 s. 

 s. 

 s. 

 s. 



s. 



s. 



s. 

 s. 

 s. 

 s. 

 s. 

 s. 

 s. 



s. 

 s. 

 s. 

 s. 

 s. 

 s. 

 s. 



siR.? 



s. 

 s. 

 s. 



32 R.? 



s. 

 s. 



3< R.? 



s. 

 s. 





















1 





















1" " 







Do 





! 







Do... 













Miscellaneous species of 

 Avena: 







25354 

















Do.... 























Do. 













s. 

 s. 

 s. 

 s. 

 s. 

 s. 

 s. 

 s. 

 s. 

 s. 

 s. 



s. 

 s. 

 s. 



36 R.? 



37 S ? 























25351 

 16894 







Do.... 







Do. 



A. orientalis pugnax 









































































25357 

 911751 





Do. 



Avena sterilis and varieties: 





543 





Do 















s. s. 

 s. s. 

 s. 1 s. 









695 









Burt 









24 In the first series inoculated, small uredinia on two out of nine leaves, flecks only on seven. All leaves 

 soon dry and dead. In the second series inoculated, heavy infection occurred on five and light infection 

 on five. 



2= Flecks only 10 days after inoculation; later a few tiny uredinia, accompanied and surrounded by 

 many flecks. 



26 No uredinia 10 days after inoculation; later a few tiny ones on each leaf, surrounded by flecked areas 

 of host tissue. 



27 In the first series fairly heavy infections were obtained on all leaves inoculated, but uredinia were 

 small. In the second series normal infection on two leaves, medium on eight, and light on two. 



28 Heavy infection on only one leaf; only a few tiny uredinia on the other two. 



29 In the first series of inoculations fairly vigorous infections were ob'tained on some of the leaves. On 

 other leaves only a few small uredinia appeared, the leaf soon drying and turning brown. In a second 

 series, normal infection occurred on all leaves inoculated. 



so Flecks only 10 days after inoculation. A few small uredinia appeared later, accompanied by distinct 

 flecks. 



3i On one plant, uredinia nearly normal in size, but accompanied by purple blotches; no uredinia were 

 produced oh the other plant. 



32 Uredinia few and small; infection not heavy. 



33 No evidence of infection in 10 days after inoculation; the few uredinia finally produced were small. 

 si Uredinia normal on one plant; on the other small and surrounded by purple blotches. 



35 Flecks only on one of the two leaves inoculated. The leaf soon dried up. A large number of normal 

 uredinia appeared on the tip of the other leaf. On most of the leaf surface, however, there were very few 

 uredinia but many flecks. 



36 Of the first series of 11 leaves inoculated 5 were heavily infected, while on 6 only flecks were evident. 

 In the second series inoculated uredinia were produced on all leaves but were accompanied by many yel- 

 lowish flecks, and larger blotches of dead host, tissue surrounded each uredinium. 



_ 37 In the first series of leaves inoculated 6 out of 10 leaves were rather heavily rusted, 1 showed light infec- 

 tion, and on 3 only flecks appeared. In the second series nearly normal infections were secured on all 

 the 8 leaves inoculated. In the third series medium to good infection resulted on all 11 leaves inocu- 

 lated. Many of the uredinia were of normal size, but surrounded by light yellowish green flecks. 



38 No uredinia. Rather indistinct light-green flecks were observed, indicative of the presence of rust 

 hyphffi. 



