ORANGE LEAF RUST OF A(;K0PYK(>N AND ELYMHS. 



17 



Orange Leaf Rust of Acjropyron and Elymus. 



In the following- table arc siinimarizod the results of inoculations 

 with the uredoforni of this rust. They were carried on siniultancously 

 with tiiose of the l)lack stem rust, and the niatm-ial was taken chiefiy 

 from the same individual host plants. 



Tamlk II. — Culture crperimenls ivilh urainji' leaf rust of Agrniijiron and Klm-Mn'. 



Date. 



Dec. 21, 1890.. 



Do 



Jfin.7, 1.H97... 



Do 



Feb. 1,1897... 



Do 



Feb. 13,1897.. 



Do 



Do 



Feb. 20, 1897. 



Do 



Do 



Do , 



Mar. 30,1897. 



Do , 



Nov. 3, 1897 . , 



Do 



Do 



Do 



Jan. 5, 1898.. 



Do 



Mar. 4, 189S. 



Do 



Localitv. 



Wa.shingtoii, D. (' . 



do.. 



do 



-do. 

 .do . 

 .do . 

 .do. 



Mar. 12, 1898. 



Do 



Do 



do 



do 



do 



do 



do 



do 



do 



do 



Manhattan, Kans. 



do 



do 



do 



Lincoln, Nebr 



do 



Origin of inoculating 

 material. 



Kye.... 



do. 



do. 



do. 



do. 



do. 



Wheat . 



Plant inoculated. 



Period 

 of incu- 

 bation 

 in days. 



Do. 



.do. 

 .do. 



.do. 

 .do. 

 .do. 



.do 



do 



do 



Rye 



. ..;.do 



do 



do 



do 



do 



do 



do 



do 



do 



do 



do 



F.I 11 III UK virt/hiK'iin.. . 



Ell/Ill ».s ruiia(lengi!< 

 fjtaud/oUiis. 



Wheat 



do 



do 



Eli/mus amcricaiius . . 



Kye 



Kli/mus vin/inictts 



Rye 



J-fli/muH virijinicux 



Rye 



Agropiirim ricliani- 

 noni. 



Wheat 



Rye 



Af/rnpi/roii teneruiii. . . 



TrUicum vill(»itim 



Elymus canade)i!<ix . . . 



Rye 



Aqropyron caninum. . 



Rye 



Wheat 



Barley 



Aqropynm tciieruru.. . 



Rve 



do 



Elymus vir'/iJiicus 



Wheat....' 



do 



.do . 



.do. 



Elymus canadensis . . . 

 Eli/mus canadensis 



(jlaucifolius. 

 Agropyron teneruvi . . 



l|-> 

 Ki 

 12 

 12 

 13 

 13 

 18 



18 



18 



12 



12 



12 



12 



2(i 



26 



9 



9 



9 



9 



21 



21 



18 



l.S 



II 

 II 

 14 



11 



Kcsult. 



Failure. 

 Success. 

 Failure. 

 Succe.'^s. 

 Failure. 

 Success. 

 Failure. 



Success. 

 Failure. 



Do. 



Do. 



Do. 

 Success. 

 Failure. 

 Success. 

 Failure. 



Do. 



Do. 

 Success. 



Do. 

 Failure. 



Do. 



Do. 



Success. 



Failure. 



Do. 



Do. 



The chief conclu.sion to be derived from the results of these cultures 

 is that the orange leaf rust is very sharply limited in its host adap- 

 tation and differs widely in this respect from the black stem rust. 

 Similar results are given in Bulletin No. 16 of the Division of Vege- 

 table Physiology and Pathology, U. S. Department of Agriculture, 

 for cultures of the forms on wheat and rye. In fact, it is (^uite proba- 

 ble that almost every distinct host species bears a distinct form of the 

 rust. One of these forms on Elyjnus virginicus L. has recently been 

 found by Doctor Arthur to be connected with the ^Ecidium on Tuqm- 

 tiens atirea Muhl. and is now to be known as Puccinla impatientis 

 (Schw.) Arth. ' 



Black Stem Rust of Agrostis alba vulgaris. 



Culture experiments with the uredoform of this rust and observa- 

 tions in the tield indicate that it is distinct and does not occur on other 



" Botanical Gazette, vol. 35, pp. 18-19, January, 1903. 

 27787— No. 63—04 2 



