/ ntroduction 



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 



Root Feeders. 



Chapter II 



(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. 



(b) Sucking. 



(1) Caterpillars 



(2) Beetles 



(3) Grasshoppers 



(4) Field Crickets 



(5) Leaf-miners 



(1) Aphids or Plant- 



(2) True Bugs 



(3) Leaf-hoppers 



ice 



Chapter IV 



Beneficial Insects (a) Predacious. 



(b) Parasitic 



(1) Beetles 



(2) True Bugs 



(3) Lace-winged Flies 



(4) Wasps 



( 1 ) Ichneumon-flies 



(2) Braconids 



(3) Chalcis-flies 



Appendix 



Bibliography 



Index 



