INJURINC4 THE STALK AND LEAF. 227 



around infested fields, or plowing one or two deep 

 furrows around the field ; (2) pouring coal tar along 

 the ground just outside the infested fields and dig- 

 ging holes occasionally on the inside of the tar line 

 for the bugs to fall into ; (3) planting strips with 

 crops not subject to injury by the Chinch Bug. 



But the most satisfactory class of remedies are 

 those by which the insects are killed outright, and 

 in future outbreaks these will undoubtedly play a 

 much more important part than in the past. The 

 bugs are easily destroyed by kerosene emulsion, and 

 by means of the improved spraying machines now 

 upon the market this substance can advantageously 

 be used against them. During fall, winter and 

 spring, all infested grass lands, and so far as possible, 

 wood lands, should be burned over to destroy the 

 hibernating bugs. Remarkable success has also 

 lately been attained in spreading, artificially, the 

 fungous diseases of the Chinch Bug. 



The Grain Aphis. 



Siplionophora avense. 

 This insect occasionally becomes destructive to 

 wheat and oats over large areas. It is a small 



Fig. 120. Oats leaf infested by Grain Aphis. 



greenish or brownish aphis, with or without wings, 

 which breeds upon wheat, oats, and various other 



14 



