RKSISTANT PLANTS IO35 



SO prone to the disease in the verj' first experiment that there was no necess- 

 ity to test them again ; others, showing greater resistance were re-tested 

 two OT more times. 



It was found that there are only a few varieties possessing great resist- 

 ance to the disease. Such are chiefly the winter wheats, including the 

 dwarf and rivet wheats. 



Among the 194 varieties of winter wheat studied, those belonging to 

 the group velutinum Schiibl. are the most resistant, namely : « Hohenheini 

 No. 77 " which was attacked 4 times during an experimental period of 

 10 years, " Fiirst Hatzfeld " and also " Fiirst Hatzfeld de Cimbal". 



Among the winter spelt varieties there were 3 blue ones belonging to 

 the group Ahfildii Korn. characterised by great resistance, namely " blue 

 winter spelt with large square ear ", " hairy blue spelt with loose square 

 ear ", and " hairy blue spelt with large square compact ear ". 



Summer wheat is slightly more resistant. Mention must be made espec- 

 ally among the 71 varieties of common autumn wheat tested, of the Ga- 

 lician varieties with large square ear, although they behaved somewhat 

 diversely in the different years of experiment. " Red Schlaustedt wheat " 

 and a wheat obtained by pedigree crossing of the varieties " Bohemian 

 Wechselweizen " x" Richelle white early " gave a like result. The most 

 resistant variety was the " beardless Odessa ", which, being tested six 

 tiraes, on one occasion showed 0.56 % and on another 2.5 % of diseased 

 ears. 



Among the rivet wheats, the variety " smooth miracle red " which was 

 tested 4 years in succession was entirely free from the disease. 



The hard wheats were difficult to infect. Two of them especially are 

 highly resistant, the " white hard smooth wheat with white awn " and the 

 " white hard smooth wheat with black awn ". 



Among the Polish wheats which were also difficult to infect, mention 

 is made of the " large ear wheat " and " black awn wheat ". 



Among the 5 varieties of spelt wheat which were generally fairly im- 

 mune, there were 2 blue ones which up to now never contracted the disease. 



" The red summer one-grain wheat " was difficult to infect. In 8 

 experiments the " red hairy summer one-grain wheat " once had no spores 

 and on another occasion had 0.77 % of diseased ears. 



The writer then mentions some varieties of winter wheat particularly 

 prone to the disease. They are : " Strube's hybrid No. 26" with 62.47 %> 

 " Strube's hybrid No. 210 " with 62.98 %, " Buhleudorf wheat with 

 vSperhng brown grain " with 64.5 % and " Heines Teverson " with 85.77 % 

 of diseased ears. 



The least resistant summer wheats were ; " Green mountain " with 

 24.2 % and " Rimpau red Schlanstedt " with 45.4 % of infected ears. 



" Wliite winter bearded spelt "had 44.87 % and the" two-grained 

 winter white semi-awned " had 85.92 % of diseased ears. 



Between the high susceptibility and low susceptibility groups are the 

 other varieties tested. It is certain, therefore, that in addition to the vari- 

 eties fairly or highly prone to the disease, there are others which rarely or 



