Reed : The mildews of the cereals 



357 



TABLE TL — Results with Hoj-deum bulbosum L. 





3 



S 



E 



u 



a 



132b 



138c 



151a 



163c 



164a 



176c 



178b 



179c 



i8ia 



Date 



1908 

 Oct, 21 



<c 



<£ 



Nov. 





21 



31 



31 



10 



10 



16 

 16 

 27 

 27 



27 



27 



Source of conidia 



Hordeiim vnlfrare 



it 

 tt 



if 



a 

 (< 



(C 



a 

 1 1 



t( 

 it 

 it 

 tt 

 t( 

 tt 

 tt 

 ti 

 It 

 ft 

 tt 



c/l 

 S 



be 



8 

 8 



9 



i8 



19 

 13 

 13 

 13 

 ^3 



13 



24 





4 



4 



I 



I 



2 



22 

 I 



2' 



§ 



o 



2 

 I 

 o 

 I 

 I 



o 



o 

 I 

 I 



2 



o 



2 



Date 



1 90S 



Oct. 



Nov. 



tt 



tt 



Dec. 



it 

 tt 

 *t 



30 

 30 



7 

 7 



19 



26 



26 



s 



5 



5 

 5 



Results 



* The second leaf inoculated. 



2 Two leaves inoculated. 



^ A few small tufts of conidia appeared on one inoculated leaf. 



Inoc. 

 p'anis 



Controls 



-1-3 



* • 



• « 



• « ■ 



In the tables given herewith, I have deemed it best to follow 

 the older classification of Linnaeus, as the various cultivated vari- 

 eties of wheat and barley are commonly referred to in this way. 

 I have, however, indicated the position of the forms tested in 

 Hackel's classification. 



The plants used in the experiments were grown in two and one- 

 half inch flower pots. In each pot some of the plants were inoc- 

 ulated, while the remaining ones were kept as controls. Gener- 

 ally the spores were sown on the first green leaf. After the 

 plants were inoculated, the pots were placed under a tall bell-jar, 

 usually three pots being placed under the same jar. The bell- 

 jars were slightly raised at the base to allow a free circulation of 

 air. The pots were placed in a saucer, and water, when needed, 

 was poured into the latter. 



The plants were inoculated by transferring with a 



scalpel 



conidia from an infected plant and spreading them over the surface 

 of the leaf of the plant that was to be inoculated. In order to be 

 sure of plenty of conidia, I found it advantageous to place infected 

 plants under a bell-jar for a day or two before inoculation. In 

 this way the conidia were formed in abundance and remained upon 

 the leaves instead of being scattered by currents of air. Thus I 



