THE iECIDIAL STAGE OP RUSTS. 



43 



Table III.— Summary of experiments to determine the vitality of successive uredo genera- 

 tions of various grain rusts — Continued. 



PUCCINIA GRAMINIS TRITICI ON BARLEY FROM WHEAT -Continued. 



Original inoculation made Nov. 13, 1906. 



Original inoculation made Nov. 22, 1906. 



Date of inocu- 

 lation. 



Number 

 of leaves 

 inocu- 

 lated. 



Date 

 matured. 



Number 

 of leaves 

 pustuled. 



Date of inocu- 

 lation. 



Number 



of leaves Date 



inocu- ! matured. 



lated. 



Number 

 of leaves 

 pustuled. 



1908. 

 Mar. 3 



10 

 10 

 10 

 10 

 10 

 10 

 7 

 7 

 1 

 5 

 9 

 10 

 10 

 10 

 10 



8 



7 

 7 



16 

 10 

 10 

 8 

 6 

 10 

 10 

 10 

 10 

 10 

 10 



1908. 



Mar. 19i 



Apr. 28 



May 13 



May 26. 



June 12 



Julv 10 



July 28 



Aug. 12 



Sept. 1 



Sept, 17 



Oct, 2 



Oct. 24 



Nov. 6 



Nov. 20 



Dec. 12. 



1909. 

 Jan. 10 



Feb. 7 



Feb. 23. 



Mar. 14 



Mar. 30 



Apr. 12 



Apr. 27 



May 20 



June 14 ... 



June 26 



July 7 



July 21 



Aug.2 



10 

 2 



10 



10 

 5 

 2 

 1 



21 

 1 



1908. 



Mar. 3. 



Mar. 30 



Apr. 12. 



Apr. 28 



1908. 



10 Mar. 19 



10 Apr. 12 



6 Apr. 28 



10 May 13 



10 



Mar. 30 



Apr. 28 



May 13 



May 26 



8 

 6 

 9 







;;;; ;;;; ; 



July 10 



July 28 



Aug. 12 



Sept. 1. 



Mavl3 



May 26. 



June 12 s 



10 I Mav26 : 10 



10 June 12 | 2 



Sept. 17 



Oct. 2 



6 



10 







'.'.'.'.'.'.'.'.'.'.'. "/////"///////.'.'.'.'.'.'.'.v. 



Oct, 24 



10 

 10 

 8 



8 



2 

 ( 4 ) 

 8 

 10 





1 



Nov. 6 







Nov. 20 . 









Dec. 12. 











1909. 

 Jan. 10 











Feb. 7. 







............ 



Feb 23 .... 





::::;:;::;:::; 



Mar. 14 





1 



Mar. 30 



Apr. 12 



Apr. 27 



May 20 



7 

 7 

 6 

 9 





1 , 

 









10 

 10 

 10 

 10 







June 26 









July 7 







July 21 





1 



Aug. 2 





1 











i 



PUCCINIA GRAMINIS HORDEI ON WHEAT FROM BARLEY.' 



Original inoculation made Nov. 14, 1906. 



Original inoculation made Nov. 22, 1906. 



Date of inocu- 

 lation. 



Number 

 of leaves 

 inocu- 

 lated. 



Date 

 matured. 



Number 

 of leaves 

 pustuled. 



Date of inocu- 

 lation. 



Number 

 of leaves 

 inocu- 

 lated. 



Date 

 matured. 



Number 

 of leaves 

 pustuled. 



1907. 



Apr. 17 



May 9 



May 28 



June 11 



June 24 



July 8 



July 22 



Aug. 6 



Aug. 22 



Sept. 9 



8 

 10 

 10 

 10 

 10 

 10 

 5 

 8 

 8 

 10 

 9 



1907. 



May 7 



May 28. 



June 11 



June 24 



JulyS. 



July 21 



Aug. 6 



Aug 21 



Sept. 8 



Sept. 25 6 



Oct. 29 



10 



4 

 1 

 2 

 8 

 8 

 10 

 6 



1907. 



Apr. 17 



Mav 8 



May 28 



June 11 



June 24. 



Julv 8 



July 22 



Aug. 7 



Aug. 22 



Sept. 9 



Oct. 16 



10 

 10 

 10 

 10 

 10 

 10 

 10 

 10 

 10 

 10 

 9 



1907. 



May 7 



May 28 



June 11 



June 24 



Julv 8. 



Julv 21 



Aug. 6 



Aug. 21 



Sept. 8 



Sept. 25 



Oct. 29 



10 

 10 

 10 

 10 

 6 

 7 

 8 

 10 

 10 

 10 



Oct. 17 



9 



iSeries sent from Washington, D. C, to Minneapolis, Minn. 



2 Extreme heat in greenhouse. 



3 Accidentally mixed with Piiccinia simplex; discarded. 



4 Notes not taken. 



5 The original material was obtained from barley November 14 and November 22, 1906. It was trans- 

 ferred to wheat and was kept on wheat continuously from that time. Notes on the inoculations from 

 November 14 and 22, respectively, to March 30, 1907, have been mislaid or lost; but six series of successful 

 inoculations were made in each case at Washington, D. C, and on.March 30 the successfully inoculated 

 plants were sent to Minnesota. The table gives the results from inoculations from this material, beginning 

 with April 17, 1907. 



e Series sent from Minneapolis, Minn., to Washington, D. C, October 8, 1907. 



216 



