Re3.(Hctcr.):5 



Although the hatch was not taken to completion, marked differences in 

 the 'hatchable' contents of the different batches of cysts are apparent. 

 It seems clear that the resistant plants produced few or no new cysts 

 and that their active root diffusates caused partial emptying of the 

 cysts already present. 



B 



250_, 

 200. 

 ISO. 

 lOO. 



so. 

 o. 



450. 



400. 



350. 

 300. 



2 SO. 

 200. 



ISO. 



lOO. 

 SO. 



o. 



aA 



ail 



INITIAL EELWORM POPULATIONS. MA> I9SS 



Effect of resisters on a normal soil 

 population, i.e. one not containing an 

 appreciable percentage of resistance 

 breakers. Resistant plants act as trap 

 crops and reduce the eelworm population 

 (Williams, unpublished). 



mill TTtm 



MAJESTIC FALLOW RESISTER 



FINAL EELWORM POPULATIONS. OCTOBER 1955 



200. 



ISO. 



lOO. 



SO. 



O. 



184% 



xtt 



■27% 



M-M 



■ 16-9% 



RESISTER AET 

 RESISTER 



FINAL EELWORM POPULATIONS, OCTOBER 1956 



