Introduction 



OUTLINE OF THE BULLETIN 



INTRODUCTION 



Outline of the Bulletin 



Key for Determining Insect Injuring Sugar Beets 



Colored Plates 



CHAPTER I 



Insects in General 



(a) Structure 



(b) Development 



(c) Classification 



(d) Methods of Control 



CHAPTER II 



Root Feeders (a) Biting (1) Cutworms 



(2) White Grubs 



(3) Wireworms 



(b) Sucking (1) Sugai Beet Root-louse 



(2) Sugar Beet Nematode 



(3) Root-knot Nematode or 



Gallworm 



CHAPTER III 

 Leaf Feeders (a) Biting (1) Caterpillars 



(b) Sucking. . . . 



(2) Beetles 



(3) Grasshoppers 



(4) Field Crickets 



(5) Leaf-miners 



. (1) Aphids or Plant-lice 



(2) True Bugs 



(3) Leaf -hoppers 



CHAPTER IV 



