LIFE HISTOKIES OF RUSTS. 



19 



Diagram 5. — Summary of inoculation experiments with stem rv^tfrom, barley. 



^38 



O 57, 7 flecked, 

 do 



B— . 1 flecked. 

 " 9 



O 



B— 



R 3g' 3 flecked. 



B-9 



Pl'l 



flecked.i 



24 



19 

 22" 





R 



27 



^ 5 

 O25- 



Bj-Wg- 



R ^' 3 flecked. — R j^ ' 



1 

 -R -3,-0" flecked. 



30 



O 27' 8 flecked. 



W 



.12 

 22 



W 



.10 

 15" 



R 22' 6 flecked. 

 ^29 



„ 36 ,53 39 20 



wro— w^g— W55— w^o- 



R 24' 7 flecked. 



O 07' 5 flecked. 



Diagram 6 summarizes the successful infections shown in dia- 

 gram 5. 



Diagram 6. — Summary of successful inoculations shown in diagram 5. 

 (B. 



B- 



O- 



O. 



R- 



W- 



O. 

 W- 



fW. 

 B- 

 O- 

 R- 



-\V- 



K. 

 B. 



B. 



B - 



R. 



W- 



R. 



O. 



-W. 



-W. 



The barley rust is seen at a glance to be more versatile than wheat 

 rust. All four cereals are directly infected by this rust, as shown by 

 diagram 7. 



Diagram 7. — Summary of successful direct inoculations of stem rust of barley. 



B ^. 



B 38 



B- 



ok 



^ 36" 



W 



30 

 44' 



216 



• Eaten by slug. 



