51 



cups. The results were iuconclusive for the susceptilile variety, 

 Dakota Amber Sorj^'o. A comparison of tlie infection results when 

 the secclHngs were jjjerininated in coarse and fine sand in sealed 

 cups showed practical])- the same relationship as just reported for 

 the non-scaled cu])s. 



Interesting results were obtained with the semi-resistant variety. 

 Feterita, which was subjected to a limited number of similar tests 

 at 22.5° C. Under lay()ral)le conditions for infection, plants of 

 Feterita may produce blasted heads, a condition known to be the 

 result of infection. A somewhat higher percentage of blasted 

 plants of Feterita was obtained from seedlings germinated in the 

 fine sand in most cases. In another series, seedlings were also 

 germinated in scaled and non-sealed cups in coarse sand onl3^ At 

 17.5° C. a higher ])crcentage of blasted jilants was obtained from 

 seedlings germinated in non-sealed cups, while at 22.5 and 27.5° C. 

 a considerably higher percentage of blasted plants was obtained 

 from the seedlings gernu'nated in the sealed cups when the sand 

 ^yas moistened with water. However, when the sand was moist- 

 ened with a 2 ])er cent, sucrose solution, the results were somewhat 

 variable. 



From these experiments it has been concluded that rather 

 slight differences in the conditions under which inoculated seeds 

 are germinated may determine whether or not a plant will become 

 infected. 



These tests with the covered smut were repeated on the highly 

 resistant Dwarf "S'ellow Alilo, and in no case did any infected 

 plants occur. This variet}' was also inoculated with spores of the 

 loose kernel smut, and the seeds germinated in coarse and fine 

 sand and in sealed and non-sealed cups, no infection taking place 

 in any experiment. 



Till-: Irjs 



P>Y ri]':oRr.]': W. Rf-ed 



Iris Plantations 



In cooperation with Mr. Montague Free, ITorticulturist, exten- 

 sive replantings of the bearded iris were made. It is several years 

 since there has been any change in the location of these varieties. 

 Several of the old 1)eds have been abandoned and new ones utilized. 



