THE ^CIDTAL STAGE OF RUSTS. 



35 



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

 tions of various grain rusts. 



PUCCINIA GRAMINIS TRITICI ON WHEAT. 



Capital letter series. 



Series 

 letter. 



1907. 

 Feb. 6 

 Feb. 19 

 Mar. 5 

 Mar. 2ti 

 Apr. 17 

 May S 

 May 28 

 Juiie 1-1 

 June 25 

 July .s 

 July 24 

 Aug. 7 

 Aug. 22 

 Sept. 9 



6 i Sept. 2( 



P 



Q 



R 



A... 

 B... 

 C... 



E... 

 F... 

 G... 

 H.. 

 I... 

 J... 

 K.. 

 L... 

 M.. 

 N. 



Date of 



iuofula- 

 tiou. 



Oct. 10 

 Oct. 31 

 Nov. 20 



Dec. 12 



1908. 

 Jau. 7 

 Jan. 2;') 

 Feb. 15 

 Mar. :< 

 Mar. 28 

 Apr. 13 

 Apr. 28 

 May 13 

 May 26 

 June 12 

 June 25 

 July 10 

 July 28 

 Au?. 12 

 Sept. 1 

 Sept. 17 

 Oct. 2 

 Oct. 22 

 Nov. 

 Nov. 20 



Dec. 12 



1909. 



Jan. 10 



Feb. 7 



Feb. 23 



Mar. 14 



Mar. 30 



Apr. 14 



Apr. 27 



May 20 



Juiie 14 



June 2() 



Julv 7 



ZZ > JulV 21 



AAA , Aug. 2 



T... 

 U... 

 V... 



w.. 



X... 

 Y... 

 Z. .. 



AA. 

 BB. 

 CC 

 DD. 

 EE.. 

 FF.. 

 GG.. 

 HU. 

 II... 

 JJ... 

 KK. 

 LL.. 

 MM. 



NN., 



00.. 

 PP.. 

 QQ.. 

 RR.. 



SS... 

 TT.. 

 UU.. 



vv.. 



WW. 

 XX. 

 YY.. 



Number 



of lca\es 



inocu- 



laied. 



10 

 10 

 10 

 10 



3 10 



10 

 10 

 10 

 10 

 10 

 10 

 10 

 10 

 10 

 10 

 7 

 9 

 10 



10 



10 

 10 

 5 

 10 

 10 

 10 

 10 

 10 

 10 

 10 

 10 

 10 

 10 

 10 

 10 

 10 

 10 

 10 

 10 

 10 



10 



10 



8 



9 



10 



10 



10 



4 



10 



10 



10 



10 



10 



ID 



Date 

 matured. 



Number 

 of leaves 

 pustuled. 



1907. 

 Feb. 19 

 Mar. 5 

 Mar. 21 

 Apr. 8 

 May 7 

 May 27 

 June 13 

 June 25 

 July 8 

 July 23 

 Aug. 6 

 Aug. 21 

 Sept. 8 

 Sept. 25 

 Oct. 8 

 Oct. 29 

 Nov. 18 

 Dec. 10 



1908. 



Jan. 7 



Jan. 25 

 Feb. 15 

 Mar. 3 

 Mar. 19 

 Apr. 13 

 Apr. 28 

 Mav 13 

 May 26 

 June 12 

 June 25 

 Julv 10 

 JulV 28 

 Aug. 12 

 Sept. 1 

 Sept. 17 

 Oct. 2 

 Oct. 22 

 Nov. 

 Nov. 20 

 Dec. 12 



1909. 

 Jan. 10 



Feb. 7 



Feb. 23 



Mar. 14 



Mar. 30 



Apr. 12 



Apr. 27 



May 20 



Jtnie 14 



June 26 



July 7 



July 21 



Aug. 2 



(10) 



1 10 



110 



110 



10 



5 



6+5 



B+5 



6+7 



10 



6 



10 



10 



10 



10 



10 



6 



9 



10 



10 s 



Lower-case letter series. 



(8) 



(10) 



10 



4 



5 



10 



5 



10 



10 



10 



7 



10 



9 



10 



'5 



G 



10 



10 



10 



6 



9 



9 

 10 



7 

 10 



4 

 10 

 10 



9 

 10 

 10 



Series 



letter. 



a.. , 

 b... 

 c. .. 

 d2. 

 e. .. 

 f... 



g--- 

 h... 

 i.. . 



]--■ 



k... 

 1... 

 m. . 

 n... 



06.. 



p... 

 q... 

 r.. . 



t... 

 u... 



V... 



w.. 



X... 



y— 



z... 



aa.. 

 bb. 



CC. . 



dd. 

 ee. . 

 ff... 



jJ - - - 

 kk.. 

 IL... 

 mm. 



nn. 



00.. 



pp. 

 qq. 

 rr.. 



SS.. 



tt.. 

 uu. 

 vv. 



WW . 

 XX. 



yy- 



zz. . 



aaa. 



Date of 



inocula- 

 tion. 



1907. 

 Feb. 6 

 Feb. 19 

 Mar. 5 

 Mar. 20 

 Apr. 19 

 May 8 

 May 28 

 June 14 

 June 25 

 July 8 

 July 24 

 Aug. 7 

 Aug. 22 

 Sept. 9 

 Sept. 26 

 Oct. 22 

 Nov. 9 

 Nov. 20 



Number 



of leaves 



i'locu- 



lalcd. 



Dec. 



1908, 

 Jan. 

 Jan. 

 Feb. 

 Mar. 

 Mar. 

 Apr. 

 Apr. 

 May 

 May 

 Jime 

 June 

 Julv 

 Jul> 



Sept. 



Oct. 



Oct. 



Nov. 



Nov. 



Dec. 12 



1909. 

 Jan. 10 

 Feb. 7 

 Feb. 23 

 Mar. 14 

 Mar. 30 

 Apr. 14 

 Apr. 27 

 May 20 

 June 14 

 June 26 

 July 7 

 Julv 21 

 Aug 2 



10 

 10 

 10 

 10 

 MO 

 10 

 10 

 10 



8 



10 

 10 

 10 

 10 

 10 

 10 



9 

 10 



10 



10 

 10 

 10 

 10 

 10 

 10 

 10 

 10 



7 

 10 

 10 

 10 



7 



Date 



matured 



10 

 10 

 10 

 10 

 10 



10 



10 

 10 

 10 

 10 

 10 

 10 

 5 

 10 

 10 

 10 

 10 

 10 

 10 



1907. 

 Feb. 19 

 Mar. 5 

 Mar. 21 

 Apr. 8 

 Mav 7 

 May 27 

 June 13 

 June 25 

 July 8 

 Julv 23 

 Aui'. 6 

 Aug. 21 

 Sept. 8 

 Sept. 25 

 Oct. 9 

 Nov. 8 

 Dec. 2 

 Dec. 10 



1908. 

 Jan. 7 



Jan. 25 

 Feb. 15 

 Mar. 3 

 Mar. 19 

 Apr. 13 

 Apr. 28 

 May 13 

 May 26 

 June 12 

 June 25 

 July 10 

 July 28 



Number 

 of leaves 

 pustuled. 



Oct. 2 

 Oct. 22 

 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) 



1 Pustules vigorous. 



2 Series sent from Wasbington, D. C, to Minneapolis, Minn. 



3 Inoculations made from material from dried leaves. 



< Three leaves inoculated from dried material, two from fresh. 



6 Plus sign signifies ' ' more tlian ' '; i. e., exact number of leaves pustuled not noted. 



6 Series sent from Minneapolis, Mirm., to Washington, D. C. 



'Greenhouse excessively hot. 



8 Several. 



9 Inoculated from HH. 



1° E.vpsriment discontinued. 



17 



'8 



I 10 



10 



9 



6+5 

 6+5 

 6+7 



8 



4 



10 



10 



10 



10 



10 



8 



9 



8 



10 



10 

 9 

 7 



10 

 6 

 10 

 10 

 10 

 7 



10 



10 



7 



(10) 



10 

 10 

 10 

 10 

 10 



10 



5 

 10 

 10 

 10 



6 

 10 



6 

 10 

 10 



9 

 10 

 10 



216 



