LIFE HISTORIES OF RUSTS. 



19 



Diagram 5. — Summary of inoculation experiments with stem rust from barley. 



, 32 



B— 



B -q. 1 flecked. 



1 



1 

 R 3 ' 1 flecked. 1 



W 



<■ 



R 43> 3 flecked. — R y 2 R T'T flecked - 



W, 



:-in 



W; 



\Y 



3ti 



53 39 20 



vv 59 NV 40 vv 20 



29 



Diagram 6 summarizes the successful infections shown in dia- 

 gram 5. 



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



B. 



0. 



w. 



B- 

 O- 

 R- 



-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. 



32 



«!• 



„30 



216 



1 Eaten by slug. 



