368 



Reed: The mildews of the cereals 



TABLE XVIL — Results with Triticum compactum Host ^ 



o c 



Date 



I 2 





Source of conidia 



losb 

 io6c 

 107b 

 io8b 

 109c 



iioa 



iiSa 



139a 

 144a 



1908 

 June 24 



'' 24 



'* 24 



July 



(ft 







o3 



o s 



« . * 



TV// 



(< 



4i 



4( 



Oct 



7 



7 



7 



22 



31 



cum vulgare 



( 





o 



s 

 o 

 u 



o 



Results 



Date 



4 

 4 



4 



6 



6 

 6 



5 

 7 

 7 



2 



2 

 2 

 I 



4 



4 

 2 



5 



10 



I 



o 

 2 

 I 

 2 



3 



2 



3 

 4 



1908 



June 30 



Inoc. 

 plants 



Controls 



f + + 



a 



July 



<i 



<i 



i i 



Nov, 



30 

 30 



14 

 29 



7 

 7 



t 



+ + + 

 +++ 

 ++ + 



+ + + 



* Jritictim sathum compactum Hackel. The variety creticum was used in all 

 the tests. 



sown on seedlings of this plant. Altogether twelve tests were 

 made, fifty-eight plants being inoculated. Salmon, however, states 

 that. three plants out of twelve inoculated became infected. The 

 species shows a marked resistance to the barley mildew, even 

 though it may not be entirely immune. 



When rye {Secale cereale) was inoculated with the barley or 

 wheat mildew, no infection occurred. This was clearly shown 

 through the large number of tests made. ..If, however-, rye plants 

 were inoculated with rye mildew, full and complete infection took 

 place. Furthermore, the mildew on rye was capable, according 

 to Marchal, of Infecting Secale anatolicttm. I have found that 

 three plants of 5. viontamun out of twelve inoculated became 

 infected. In these successful infections there was a very vigorous 

 growth of mildew. In the three attempts made with Secale dal- 

 matic7tm no infection occurred. 



Conidia from wheat {Triticum zndgare) failed to infect any of 

 the other cereals. Conidia from this same host, however, pro- 

 duced full and complete infection upon all of the eleven species of 



Triticum tested. 



I p actum 



(six varieties), T Freycenetii, T polonictim, T. Spelta, T. Thaoudar, 

 T Tiimonia, T turgidwn, and T vulgare which were inoculated 

 with conidia from wheat, became infected. 



Fifty -seven leaves of Triticum moiiococcum were inoculated and 

 forty-seven of these became infected. In most cases a good, vigor- 

 ous growth of mildew was present. 



