VI. 



Coxi'ten.'ts. — Continnerl. 



Section VI. The Natural 

 Enemies of the Er/y. Page 



The Vermilion Parasite 



The Trash-coloured 

 Parasite 



The Panama Parasite 

 Enemies of the Nymph. 



i3irds 



The Syrphid Fly 



Ants 



Toad-bugs 

 Enemies of the Adult. 



Birds 



Lizards 



Frogs and Toads 



(Grasshoppers 



Ants 



Fireflies ... 

 Hype r - Pa rasit e-s. 



Mongocse . 



Rats ... 



Birds 



Lizards ... 



Snakes 



Grasshoppers 



Discussion, The Parasite Complex 



Enemies of the Fraqhojipfr' 



P.UiE. 



The Root Disease^ of Suyar-Cane. 



The Soil 

 Temperature 



Tillage... 



Depth of Planting... 



Distance of Planting 



Section VIL 



Fungi Concerned 

 Discussion and Symptoms 

 Root Disease in Trinidad . 



Section VIIL The Factors InJluenciiKj >ht 

 The Physical Eiirironmenf. Page 

 Raiiifidl .. ... 96 



Contour ... .. 105 



A yric ulturnl Procts'^ts . 



Drainage ... ... 113 



Manuring ... .. 114 



Age of Cane.. ... 1 15 



Rotation ... ... 117 



Variety of Cane 



Presence of Pests and Diseases. 

 Froghopper 

 Root Fungi 

 Other Insects 

 Previous Damage and Source of Plants 



Section IX. General Problems. 

 The Cause of the Bliyht. 



The Froghopper. Nyinph or Adult 



Possilile Infection or Toxin 



Root Disease 



Relation Between Root Disease and Froghopper 



Attractiveness of Diseased Canes 

 Direct and Indirect Effect of Environment 

 Periodicity and Relative Sizes of Broods 

 Cause of Recent Prevalence of Blight 



93 

 94 

 95 



Preraltnce of Bliyht. 



106 

 113 



118 

 119 

 119 



119 



120 

 120 

 120 

 121 



122 

 124 

 125 

 125 

 126 

 126 

 129 

 1 3(1 



