ILLINOIS TREES: SELECTION, PLANTING. AND CARE 



Fig. 9 (Above). — Lom- 

 bardy poplar trees fre- 

 quently are killed by a 

 fungus disease, Cytospora 

 canker. 



Fig. 10 (Left).— Cracks 

 which extend into the 

 heartwood are conspicuous 

 in the trunks of some Lon- 

 don plane trees during the 

 winter months. 



