CONTENTS. 



Diseases of trees, . 



Diagnosis of disease, . 



Fiingous diseases of trees, 



Wood-destroying fungi, 



Slime-flux, . 



Treatment of fungous diseases of trees. 

 Winter injuries. 



Winter injuries of roots. 



Winter injuries above ground. 



Frost cracks. 



Winterkilling of cork cambium. 



Sun scald, .... 

 Drought, .... 

 Sun scorch and bronzing of leaves. 

 Mechanical injuries, 



Earth fillings around trees, . 



Bleeding of trees, 

 Injurious chemical substances, 



Kerosene oil, 



Gas oil, 



Paint, 



Miscible oils. 



Road oil. 



Creosote, . 



Coal tar. 



Salt, . 



Other injurious substances, . 



Banding substances. 

 Effects of illuminating gas on trees, 

 Effects of atmospheric gases on vegetation 

 Electrical injuries, . 



Effects of alternating currents, 



General effects of direct currents. 



Death of trees from direct current 



Electrolysis, 



Lightning, . 



Earth discharges. 



Susceptibility of different trees to lightning stroke 



Injuries to trees from arc lamps, 



Injury to trees from wires, . 

 The spraying of shade trees, 

 Valuation of shade trees. 

 Court decisions concerning damages to trees. 

 Codified shade tree laws of Massachusetts, 1915, 



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Publication of this Document 



approved by the 

 Supervisor of Administration. 



