TABLE OF CONTENTS. 



PAGE. 

 Varieties 



Standardization of Varieties 44 



Production of New Varieties 44 



Mixing of Varieties 45 



Classification of Varieties 45 



Description of Varieties 48 



Insect Pests 



Colorado Potato-beetle 57 



Blister-beetle 57 



June Beetle (White Grub) 58 



Flea -beetles 58 



Cutworms 58 



Diseases 59 



Late Blight 60 



Rhizoctonia (Black Scurf) 61 



Fusarium Wilts and Rots 62 



Common Scab '. 63 



Powdery Scab 64 



Silver Scurf 64 



Potato- wart 64 



Soft-rots 65 



Internal Brown-streak (Net Necrosis) 66 



Internal Brown-spot 66 



Hollow-heart (Hollow-potato) 66 



Black-heart 66 



Frost-injury 66 



Leaf-roll *. 66 



Mosaic 68 



Early Blight 69 



Tip-burn 69 



Disinfection of Seed-potatoes 



Formaldehyde Treatment 70 



Corrosive Sublimate 72 



Spraying 72 



Spray Mixtures 73 



