3Liet of SHustratfons. 



PAGE 



Plate I. Portion of field untreated and treated with Vaporite. 18 



Plate II. The Large Poplar Longicorn. ... ... ... ... 19 



Plate III. The Pine Beetle 20 



Plate IV. The Ash Bark Beetle 21 



Plate V. The Lackey Moth. 25 



Plate VI. The Pine Shoot Tortrix. ..*. 27 



Plate VII. Tent of Apple Ermine Moth 28 



TEXT FIGURES. 



The Apple Sucker (Psylla mali). ... ... ... 16 



The Cabbage Gall Weevil (Ceuthorkynchus sulcicollis). 21 



The Turnip Dart Moth (A gratis segetum). ... ... 26 



The Pear Midge (Diplosis pyrivova). ... ... ... 34 



6. The Winter Moth (Cheimatobia brumata). 

 The Great Yellow Underwing Moth. ... 

 The Small White Cabbage Butterfly. .. 

 The Plum Bark Beetle. . 



34 

 39 

 39 

 40 

 40 



