INSECTS INJURIOUS TO BEANS AND PEAS 



327 



placed in the bottom and covered with a film of kerosene. The 

 pan is drawn between the rows while a boy on each side brushes 

 the aphides into it with a branch as shown in Fig. 235. The pans 

 are easily made from galvanized iron and may be operated at 

 small cost. 



Though the above methods will destroy quantities of the 

 aphides and thus prevent the destruction of the crop, they do not 



FIG. 235. Sho.wing the structure of pan and use of it with brushes against 

 the pea louse. This field was saved by its use. (After W. G. Johnson.) 



dislodge the young aphides in the terminals, and therefore cannot 

 be relied upon to prevent all injury. Practical field tests have 

 shown that this may be done by spraying with whale-oil soap, 1 

 pound to 6 gallons of water. In small gardens this may be applied 

 by means of bucket or knapsack pumps, and on small acreages 

 'with a barrel sprayer with a row-spraying attachment having noz- 

 zles arranged so that the vines will be thoroughly covered from 

 each side. The spray must be applied with considerable pressure 



