9 
Mould—grey or black fluffy growths, mycelial or conidial structures, 
usually accompanying necrotic lesions; sometimes used synonomously 
with mildew. 
Ooze—sticky gummy or fluid exudates from certain lesions. 
Punks—sporophores of basidiomycetous shelf-fungi whose presence 
on the surface of apparently healthy trees is evidence of heart- or sap-rot. 
Attempt to identify with one of the above, each symptom or sign of 
disease observed on the trip. Classify the signs and symptoms represented 
in the collected materials. 
The instructor in charge will explain the cause, stages of development 
and other points of interest concerning some of the diseases met with. 
REPORT 
1. Describe and sketch the signs and symptoms of ten diseases, 
illustrating the different types observed during the trip. 
