CONTENTS 



CHAPTER I 



PAGE 



Seedung Diseases and Injuries 1 



Damping-off 2 



Sun-scorch 9 



Winter-drying 11 



Freezing-to-death 12 



Smothering-disease 15 



CHAPTER II 



Leaf Diseases and Injuries 17 



Winter-drying 18 



Late frost-injury 21 



Drought-injury and sun-scorch 22 



Smoke- and gas-injury 23 



Leaf-spots 27 



Powdery mildews 34 



Leaf-cast of conifers 38 



Sooty molds . . . . ' 41 



Silver-leaf .41 



CHAPTER HI 



Body and Branch Diseases and Injuries 45 



Freezing-to-death of twigs and bark 47 



Frost-cracks 50 



Sun-scald 52 



Lichen-injury 52 



Slime-flux 53 



Mistletoe diseases 54 



Electrical injuries 60 



ix 



