ROOT-KNOT OR EELWORM ATTACKSf^NEW^HOSTS* 



Leo E. Melchers. 



In addition to the hosts known to be attacked by Heterodera 

 radicicola, pecuHar 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. 



551 



