28 



Stem-disease caused hif the Eehrorm 

 'I'ahlc II (continued). 



Name of |)laiit 

 H'hik clover, W'ild (.'ejtswoM 



Avcnigf ... 

 While cloicr, Willi KeiitiBli 



Average ... 



Kiilnci/ rclch 



Average 



Sainfoin ... 



Averajre ... 

 Lucerne ... 

 Trefoil 



BISCUSSIOX. 



Jn a hioloiiical iuvestitiation of this character it is practically im- 

 possible to repeat the experiments exactly, and consequently one would 

 not expect to get the same figures in a repeat experiment. 



Nevertheless, one would, I think, obtain figures having the same 

 relative significance, and for this reason the figures put forward above 

 as indices of susceptibility may be taken as representing approximately 

 the relative susceptibilities of the dift'eront clovers, etc. to 7'//. dipsad 

 attack. 



An examination of the figures shows that all the varieties of red 

 clover tested are very susceptible to attack and fall into a common 

 group (1) to which also belong cow-grass (Swedish) and kidney vetch. 



Arranged in order of intensity of susceptibility we have them as 

 follows: 



lied clover (Canadian) ... 

 (French) 

 (English) 



Cow-grass (Swedish) 



Kidney vetch 



Red clover (Wild English) 



.•$ll> 'i 

 20.5 I 



190 ,, , 



163-75 I 



100 



