169 
Make an enlarged and detailed prawine of a V-shaped portion of the 
section from the center to the outside. including one vascular wedge and 
medullary ray. Indicate the presence of the parasite in the cells by fine 
stipple-work. 
REPORT 
1. Describe fully the effect of the disease on the morphology 
of the root. What is meant by pathological morphology? 
2. Explain the difficulties involved in the control of this disease 
by eradication measures. 
