Sick Soils 



27 



Control. Immersing fern plants for five minutes 

 in water heated to 122 degrees F. (50 degrees C.) 

 does not seem to injure the ferns, but seems to kill 

 the nematode. All infected leaves should be cut off 

 and burned. Diseased plants should be isolated from 

 healthy ones. Spraying with Bordeaux may also 

 act as a repellant. 



