t-^ONTENTS 



PAGE 



Preface v 



Introductoky ... 1 



Historical 3 



Damage caused by Plant Diseases ..... 12 



Symptoms of Disease . 14 



Prevention or Cure of Plant Diseases .... 18 



Public Plant Sanitation ........ 24 



Fungicides . 25 



Spraying Machinery 39 



Cost of Spraying 45 



Profits from Spraying . . . . . . . » . 50 



Soil Disinfection 54 



General Diseases . . 60 



Diseases of Special Crops 69 



Pomaceous Fruits 69 



Drupaceous Fruits 115 



Small Fruits 144 



Tropical Fruits . 184 



Vegetable and Field Crops 194 



Cereals . 319 



Cereal Smuts, General 319 



Cereal Rusts, General 323 



Anthracnose of Cereals 327 



Special Diseases of Cereals . ... 327 

 ix 



