172 



Principles of Plant Culture. 



soon perishing. Grasshoppers may also be poisoned by 

 distributing bran mixed into a mash with water con- 

 taining arsenic in solution. Plowing grass land contain- 

 ing the eggs of grasshoppers tends to prevent an attack. 



304. Apparatus for Ap- 

 plying Insecticides. Pow- 

 ders are readily applied to 

 (■^ ^^Jm—^ ^ H low-growing plants, such 



Fig. 69. Fig. 70. 



Fig. 69. Knapsack sprayer for small trees. Brandt Mfg. Co.. 



Minneapolis. 



Fig. 70. Barrel pump for small orchard 

 Ohio. 



The Deming Co., Salem, 



as the potato, cabbage, etc., by means of a sifting-box 

 consisting of a pail with a perforated bottom, a rigid 

 handle and a tight-fitting cover (Fig. 68). For small 

 plants, such as young potato tops, the tin disc A which 

 has a circular hole in the center, is laid inside on the 

 bottom of the box, and held in place by small lugs 



