AND OTHER INJURIOUS INSECTS OF I907 AND I908. 



2-7 



the plans below, particularly to save this alfalfa, but since the idea 

 appears to be a good one, and one which will suggest something similar 

 or better, not only for experiment station work on trial plots, but on 

 a commercial scale, where low growing plants, which grow in rows, 

 are affected, we go into some detail regarding its construction, and 

 illustrate fully the method of its use. As a result of employing it once, 

 fully fifty per cent of the hoppers on these plots were killed. 



The hopper dozer above referred to was made of two parts, the 

 lower of these parts consisting of a U-shaped pan and of one thick- 



Fig. 11. Pan. 



ness of galvanized iron. The edges of this pan were two inches 

 high. A one-inch board, five inches wide, was nailed on to each side 

 of the pan to serve as a runner, and a similar board two inches wide 

 was nailed to the back. The tops of these boards were all even with 

 the edge of the pan all the way around. A stout cord was attached 

 to the front end of each runner with which to draw the apparatus. 



The upper portion (see Figs. 12 and 13) of the hopper dozer 

 was made up of a frame work consisting of four two-foot corner posts, 

 held together by pieces nailed on top, and similar pieces nailed on 

 the sides and ends about three inches from the bottom. This frame 

 was covered with canvas. 



