Res. (He tor.): If 



tabtj: 8 



Tests of the resistan t S. n ndigena - S. tnh.'^jro^ium, cross, Z3/7 , 

 against various local races of potato root eelwor m. 



New cysts per pot at the end of the test 



% 'nean 

 Source of Tomato Potato Z3/7 Means lor 



Cysts (Klondyke Red) (Arran Banner) 1 2 3 pooato 



Batch I 



Duddingston 

 Bog Hall 

 Feltwell 

 Frainpton 

 Rothamsted (1) 

 Shelford 



Means 



30 



70 



222 



85 



169 



223 



133 



l,h63 



Batch II 



Ramsey 



Rbthamsted (2) 



Fosdyke 



Deeping 



Scilly 



Gulval 



Means 



Controls ( 

 ( 

 ( 



52 

 36 



h5 



ili5 



73 



12 



60 



1 

 3 

 1 



