42 



THE RUSTS OF GRAIN'S IN THE UNITED STATES. 



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

 tions of various grain rusts — Continued. 



PUCCINIA RUBIGO-VERA SECALIS ON RYE— Continued. 



PUCCINIA GRAMINIS TRITICI ON BARLEY FROM WHEAT.* 



1 Extreme heat in greenhouse. 



2 Several. 



3 Inoculations made from GG. 



4 Experiments discontinued. 



t- The original material wius obtained from wheat November 13 and 22, 1906. It w;is transferred to barley 

 and was kept on barley continuously from that time. Notes on the inoculations from Noveml)er 13 and 

 22, respectively, to March .30, 1907, have been mislaid or lost; but six series of successful inoculations were 

 made in Ciich 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, beginningwith April 17, 1907. 



6 Pustules vigorous. 



' Series sent from Minneapolis, Minn., to Washington, D. C, Octolser, 8, 1907. 



8 Inoculations made from material pustuled Septemlier 2.'j, 1907. 



"Inoculations made from material pustuled January 8, 1908. 



216 



