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 
eelworm 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. 
