NEMATODE GALLWORM ON POTATOES, ETC., IN NEVADA. 15 



be grown on infested fields until the nematode is practically starved 

 out. 



It is very diflicult to eradicate the nematode completely when it 

 is once well established in a field, but its numbers may be so reduced 

 by the use of immune crops that susceptible crops may be grown 

 again without serious injury. 



Approved : 



James Wilson, 



Secretary of Agriculture. 



Washington, D. C, February 10, 1912. 



[Cir. 91] 



o 



