that the regular crop is planted, might ])rove useful, since the 

 organisms, according to our observations, show preferences in 

 regard to the host attacked. The crop could be managed some- 

 what similarly to a cover crop, and when the roots are well 

 infected, which would be in a few weeks, the crop could be 

 pulled up and destroyed and another planted in its place. 



One of the most practical methods of ridding a house of 

 eel worms, when the proper facilities are at hand, consists in 

 sterilizing.! With special appliances this can be done effectively 

 at no great cost, and is on the whole the cheapest and best 

 method of destroying this pest. 



Fig. 8, showing eel worm 

 galls on tomato roots. 



In our sub-irrigation experiments with tomatoes we found 

 that water allowed to remain in the soil for any length of time 

 w^as very injurious to eel worms. In the boxes and plots which 

 were sub-irrigated eel worms were rare, and in most instances 

 entirely absent, whereas on the top-watered plants in all cases 



1. Mass. Agr. Exp. Sta., Hatch, Bui. No. 55. 1898; also Hatch Exp. Sta., 

 Rept., 1902, p. 74; Hatch Exp. Sta., Report, 1905, pp. 10—14; Hatch Exp. 

 Sta., Rept., 1903, p. 38; Mas.s. Agr. Exp. Sta., Rept., 1909, pp. 58—61. 



