CONTENTS Xi 



CHAPTER X 



PAGES 



OBSTRUCTIONS TO GROWTH AND DEVELOP- 

 MENT 111-127 



Influence of Season and Climate, in; Weeds, 

 112; Diseases Due to Parasitic Fungi and Bacte- 

 ria, 112; Late Blight or Rot, 112; Early Blight 

 or Leaf Spot Disease, 118; Potato Rosette, 118; 

 Scab, 119; Diseases in Storage, 121; Wet Rot, 

 121 ; Dry Rot, 122; Stem Rot or Bundle Blacken- 

 ing, 122; Bacterial Diseases, 122; Insects, 123; 

 Flea-beetle, 123; Potato Bug, 124; Potato Worm, 

 125; Potato Stalk Weevil, 126; Grasshoppers, 126; 

 June Bug, 126; Wireworms, 127; Striped Blis- 

 ter Beetle, 127; Arsenical Poisoning, 127. 



CHAPTER XI 

 SPRAYS AND SPRAYING : 128-142 



Fungicides. 128; Bordeaux Mixture, 128; Mixing, 

 129; Testing Bordeaux Mixture, 130; Strength 

 of Solution, 130; Bordeaux Dust or Dry Bordeaux 

 Mixture, 130 ; Washing Soda and Copper Sul- 

 phate Mixture, 131; Benefits from Use of Bor- 

 deaux Mixture, 131; Time of Spraying, 134; 

 Number of Sprayings, 134; Insecticides, 135; 

 Paris Green, 136; Lead Compounds, 137; Arsenic 

 and Lime, 138; Cost of Spraying and Profits De- 

 rived, 139; Spraying Machines, 140. 



CHAPTER XII 

 HARVESTING 143-146 



Digging, 143; Methods of Digging, 143; Diggers, 

 144. 



