58 



CEREAL RUSTS (:»F THE UNITED STATES. 



The latest date at wbicli the writer observed the uredo on wheat at 

 Manhattan was August 27. A case observed as late as September 

 19, supposed to be this rust, was afterwards found to be Uredo ruhujo- 

 vera. At Lincoln, Nebr., the uredo was found to be still active on 

 Eordeumjuhatnm as late as October 25, and if identical with the form 

 on Ehjmns canadensis glaneifoUus, Agrojyyron tenernm, and A. richard- 

 soni it was found on these hosts at the same jilace as late as November 

 16, 1897. 



Liability of different varieties to this rust. — The series of experiments 

 for testing rust liability of wheat varieties made by McAlpine (51, pp. 

 27, 28; 52, p. 20) in 1893 and 1894 and by Eriksson (31, pp. 333-341) in 

 1890-93 are tlie only ones reported in which it was stated that P. graminis 

 was the cliief species concerned. There is no means of knowing from the 

 reports of any other experiments, whetlier in Australia or elsewhere, 

 which rust was most abundant or whether both were present. However, 

 in the reports of certain experiments, especially those conducted by 

 Maddox (50, pp. 8-23), it is frequently stated what part of the plant was 

 affected, that is, whether the stem or the leaves. In such cases it may 

 be inferred that both rusts were present, but as to which one predomi- 

 nated only a guess, based on the comparative amounts of rust recorded 

 on the leaves and stems, can be hazarded. 



As already stated, this rust was present in the writer's experiments 

 at Salina and Manhattan, but appeared so late in the season that at the 

 latter place no satisfactory estimate of the rustiness of different varie- 

 ties could be made, and at the former, for the same reason, the rustiness 

 of spring varieties only could be graded. The following table shows the 

 percentages of rust on the spring varieties : 



Table 9. — Comparative amount of Pucoinia graminis on different varieties of sxjriruj wheat 



at Salina, Kans., in 1896. 



Localities and names of 

 varieties. 



Bald 



....do... 

 ....do... 

 ....do... 

 ....do... 

 do... 



Korth Dakota : 



Glyndon 669 



Glyndoii 073 



Glyndon 675 



Gryndou747 



Glyndon 775 



McKissicks Fife 



Russia: 



Alsace 



Arnautka 



Byelokoloska 



Byelokoloska (Kursk) . 



Ciiernokolo-ska 



Gharnovka 



Gliirka 



Ghirka (Samara) 



Gliirka (Ekaterino.slav) 



Imperial 



Kra.snokoloska 



Polish 



Saxonka 



Siberia : ! 



Beloturka Bearded 



Byelaya I 



Chernokoloska 



Kitaiska j Bearded 



Bald or 

 bearded. 



....do ... 

 Bearded . 



Bald 



....do... 

 Bearded . 

 ....do... 



Bald 



....do... 

 ....do... 

 Bearded . 



Bald 



Bearded . 

 Bald 



Per cent 



of 

 rustiness, 



Traces. 

 Traces. 

 Traces. 

 Traces. 

 Traces. 

 Traces. 



10 

 5 

 40 

 25 

 10 

 10 

 45 

 30 

 15 

 20 

 15 

 25 

 30 



5 



15 



5 to 1.5 



15 



Localities and names of 

 varieties. 



Siberia — Continued. 



Melka (Nerchinsk) 



Australia : 



Blounts Gypsum 



(Carre de Sicile Rouge 

 X Honrblende) x Im- 

 proved I'ife. 



14 X ([300 X Medeah] 

 xl4). 



Gypsum X (Improved 

 Fife X Gypsum.) 



Ladas (=42 a x La- 

 doga) 



Priugles Defiance 



Argentina: 



BahiaBlanca 



Barletta 



Barletta (Santa Fe) ... 



Candeal Rcdondo 



Chubut 



Chubut Spielart 



Entre Rios 



Frances 



liusso 



Sa]dom6 



Tusela .. 



Bald or 

 bearded. 



Bald . 



.do, 



Bald . 



-do 



Bearded 



Bald 



do.. 



Bearded 

 Bald 



Per cent 



of 

 rustiness. 



Traces. 



Traces. 

 Traces. 



Traces. 



Traces. 



5 



Traces. 



5 

 5 

 15 

 10 

 15 

 10 

 Traces. 

 15 

 15 

 20 

 20 



