ROOT-KNOT OR EELWORM ATTACKS^NEW HOSTS* 
Leo E. Melchers. 
In addition to the hosts known to be attacked by Heterodera 
radicicola, peculiar circumstances recently made it possible for 
the writer to note and observe its occurrence on seven new and 
unreported hosts. 
Fig. 1. Root-knot of parsley. 
Two-thirds natural size. 
Photo by L. E. Melchers. 
During December, 1913, the writer noticed the first indications 
of the root-knot on the tomato crop which was being grown in one 
of the greenhouses belonging to the Department of Horticulture 
of the Kansas State Agricultural College. By the end of April 
the tomato plants were removed on account of their unproductive¬ 
ness, due to the eelworm infestation. The roots of these plants 
* Kansas State Agricultural College, Manhattan, Kansas. 
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