554 



The Ohio Naturalist. 



[Vol. XV, No. 8, 



were badly affected with the nematode; this is likewise an unre- 

 ported host. The plants were growing out in the open field at 

 the time the injury was observed. It is not definitely known wheth- 

 er these plants became infected from nematodes which remained 

 alive in the field over winter, or whether contamination resulted 

 otherwise. 



Fig. 3. Root-knot as it occurs on tomato. 

 Two-thirds natural size. 

 Photo by L. E. Melchers. 



Apparently climatic conditions in this region cannot be too 

 stringently depended upon as a means of control in holding the 

 eelwomi in check in the open fields. The winters vary in severity, 

 and are not always severe enough to eradicate the pest in badly 

 infested soils. 



