CONTENTS 



Symptoms and Cause 5 



How the Disease Spreads 9 



Insect Carriers 9 



Root Graft Transmission 12 



Susceptibility of Different Species 12 



Disease Control Practices 13 



Sanitation 13 



Spraying 15 



Killing Grafted Roots 16 



Additional Control Treatments 17 



The Dutch Elm Disease Lesson 19 



This circular, printed by authority of the State of Illinois {Ch. 127 IRS, Par. 58.21), 

 is a contribution from the Section of Applied Botany and Plant Pathology of the 

 Illinois Natural History Survey. 



URBANA 44697— 6M— il^ -m OCTOBER, 1967 



