WHEAT 



63 



find their way to a point witliin the leaf-sheath, where 

 their injuries cause many of the stems in spring to break 

 and faU over. The name " flaxseed " is applied to the 

 pupal or transforming stage of the insect because of the 

 resemblance of the pupa in color and shape to a flaxseed. 

 This pest spends the summer on the wheat stubble. 

 Hence the usual means of combating the insect is to burn 

 the stubble, or to plow it in thoroughly. Postponement 

 of so'wing until a severe frost occurs greatly decreases the 

 number of eggs deposited in the fall. Rotation of crops 

 is an important 

 means of decreas- 

 ing the injury. 



Chinch bugs. — 

 Small insects that 

 undergo a nmnber 

 of changes in size 

 and color; are 

 sometimes injuri- 

 ous to wheat. 

 When warfare is 

 made against them , 

 it is usually after 

 they have emerged 

 from the wheat 

 fleld and are invad- 

 ing corn fields. 



The ivheat -plant- 

 louse or " green- 

 bug" (Fig. 9j. — This small gjeenish plant-louse has in 

 some years proved very injurious to wheat in the south- 



FxG. 22. — The Axg'jU-Mois Cjkaix-moth. 

 Enlarged 6 times. CSV. E. Hind.s.) 



