CONTENTS 
PART I. 
PAGE 
Introduction_ 7 
Line of Work; Historical. 
Development of Fungus_ 8 
The Rhizoctonia Stage; The Sclerotia State; The Corticium Stage. 
Injuries_ 11 
Plant Injuries; Scabbing; Rotting of Seed Tubers. 
Spread of the Disease_ 13 
Rate of Growth at Different Temperatures; The Soils; Influence of 
Heat and Moisture; The Seed Potato; Insect Injuries; Infected 
Plants. 
Remedial Measures _ 14 
The Soil; Cultivation; The Runs; Late Planting; Old Stems; The 
Seed Potato; Developing a Disease-Resistant Variety; Seed Selec¬ 
tion: Corrosive Sublimate and Formalin Treatments; Sulphur; Lime. 
Conclusions_ 20 
PART II. 
Experiment I_ 21 
Garden Land; Formalin Treatment; Cull Seed; Spraying with 
Bordeaux Mixture. 
Experiment II _ 22 
Old Potato Land; Formalin and Corrosive Sublimate Treatments. 
Experimemt III_ 23 
Old Potato Land; Corrosive Sublimate Treatment. 
Experiment IV_ 24 
Old Potato Land; Corrosive Sublimate Treatment. 
Experiment V _ 25 
Old Potato Land; Corrosive Sublimate Treatment. 
Experiment VI _ 26 
Old Farm Land; Corrosive Sublimate and Formalin Treatments; 
Cull Seed. 
Experiment VII_ 27 
New Land; Corrosive Sublimate and Formalin Treatments; Dou¬ 
ble Treatments; Light Experiment; Stem End Experiment. 
Experiment VIII _ 29 
Old Garden Land; Corrosive Sublimate Treatment: Large Selected 
Seed: Small Selected Seed; Diseased Seed. 
