12 



BULLETIN 629, U. S. DEPARTMENT OF AGRICULTURE, 



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



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



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





Identification numbers. 



Crown rust. 



Stem rust. 





Variety. 



■5 

 s 



o 



is 



1-1 .2 



£ u 



3 



O 



Ph' 

 03 



OQ 



bo 



S 



03 



CO 



So 

 - g 



E 



M 



C 



0) 

 OS 



~ g 



^- Ml 



Ph 



Remarks. 



1 



2 3 



4 



5 « 



7 



8 



9 



10 





Avena sterilis and varie- 

 ties — Continued. 

 Burt 



76 



81 | 



696 





39 R ? 

 OR.' 



«R.? 



S. 



s. 

 s. 

 s. 

 s. 

 s. 

 s. 

 s. 

 s. 

 s. 



s. 

 s. 

 s. 

 s. 

 s. 

 s. 



s. 



s. 



I: 



S. 



s. 

 s. 

 s. 



51 S.? 1 



s. 

 s. 



s. 



55R.+S. 



s. 

 s. 



59 R.? 



s. 

 s. 





Do 



710 









Early Ripe 







•3R.r+S) «R. 



45 R? . 46 R. 

 47 S? 48 R^ 

 49 S ' 50 R 9 





Cook 



77"' " 



73 



697 

 694 

















Golden Rustproof 



61 509 







. 



Do 



93 

 54 



0. 



58 



. 



52 

 62 



78 

 59 

 53 



67 



1796 









8. 



S. 



s. 



52 R. 



s. 



5< S.? 

 66 R.? 



»s.? 



s. 



S. 

 S. 



s. 



53 R 

 g 



57 R. 



s. 

 s. 





Italian Rustproof 



388 









Do 



397 

 409-4 









Italian Rustproof selec- 



■-" 





tion. 

 Red Rustproof 





309 





Red Rustproof selection 



1 26i-7 



518-15 



700 



487 



356-19 



fi97 







Do 







Do 













Turkish Rustproof se- 

 lection. 

 Do 



s. s. 



60 R ' 61 P 





















39 Three series of inoculations were made. In each some leaves -were rather heavily rusted . others lightly, 

 and on some no uredinia (only flecks ) were formed. Telia were freely produced on leaves where no normal 

 uredinia had previously ruptured the epidermis. 



v > Normal uredinia on one leaf; flecks only on the other. 



41 In the three series of inoculations made no leaf was heavily rusted. Only a few had even a slight infec- 

 tion, while most of them very quickly showed large reddish brown blotches of dead tissue and smaller 

 yellowish green flecks and no uredinia (see PI. III). 



« Normal infection at the base of each leaf, the upper portion heavily flecked and soon turning brown 

 in color, with no normal uredinia. 



43 In the seven series inoculated, there were both susceptible and resistant plants, the former with many 

 normal uredinia, the latter with few and small uredinia or flecks only. On many leaves, large blotches of 

 host tissue were killed soon after inoculation. On some of these, telia were later developed. 



** Of five leaves inoculated, on only one were normal uredinia produced and these only at the base. On 

 one leaf a few tiny uredinia were formed, and on three flecks only appeared. 



4i In the first series of 6 leaves inoculated, a few light-green flecks furnished the only evidences of infec- 

 tion. In two later series of 6 and 10 leaves inoculated, normal infections occurred on 8 of the l*i, while the 

 other 8 had only small uredinia or flecks. 



48 No uredinia appeared in three weeks after inoculation: then only tiny ones on one leaf. Distinct 

 flecks were evident. 



47 Of 9 leaves in the first series inoculated, 1 was heavily rusted, 6 medium, and on 2 only flecks appeared. 

 Of 14 leaves in a second series, fairly normal infection occurred on all, though some uredinia were rather 

 small. No sharp indications of resistance. 



« Two leaves inoculated; on neither were any normal uredinia produced. Uredinia small and accom- 

 panied by flecks. 



45 In the first series of 8 leaves, normal infection occurred on 5, light on 2, flecks only on 1. In the 

 second series of 9 leaves, 4 were heavily rusted and 5 lightly. 



5° No uredinia in 11 days after inoculation, then only 1 or 2 small ones on each leaf. There were also 

 blotches of dead host tissue. 



s« No uredinia normal in size or vigor: after 21 days they were still small. 



62 Of 6 inoculated leaves in the first series, normal infection was produced on 3 and very small uredinia 

 and flecks on 3. No normal inlection occurred on 9 leaves inoculated in the second series. There were 

 only a few tiny uredinia with many flecks. 



53 No signs of infection except dead leaf tips. 



5< In the first series of 9 leaves inoculated, normal infection was secured on 6, while only flecks ap- 

 peared on 3 in the time characteristic for uredinia. Telia were formed later. In the second series, the 

 2 leaves inoculated were rusted heavily. 



w Normal (very heavy) infection on one culm: only a very few small uredinia on the other. 



5« No evidences of infection on the leaves of the first series inoculated. Only a few tiny uredinia were 

 formed on the 9 leaves in the second series inoculated. 



5' Only a few very small uredinia: many flecks. 



68 Of 10 leaves in the first series inoculated, 6 were heavily rusted and a light infection on 4. Of 11 leaves 

 in the second series, 6 were heavily rusted, on 4 only a few very small uredinia developed, and on 1 only 

 flecks appeared in the time usual for uredinia formation. An abundance of telia later occurred. 



» No uredinia of normal size and vigor; only a few tiny ones on each leaf. 



« Of the first series of five leaves inoculated, one was very heavily rusted, three had only a light infec- 

 tion, and on one only flecks were produced. All leaves of the second series inoculated were rather 

 heavily rusted, but numerous flecks were observed, also indicating some degree of resistance. 



61 Infection not heavy: uredinia on each leaf few and small. 



