158 Principles of Plant Culture. 
poisoned by distributing bran mixed into a mash with water 
containing arsenic in solution. Plowing grass land contain- 
ing the eggs of grasshoppers tends to prevent an attack. 
304. Apparatus for Applying Insecticides. Powders 
are readily applied upon low-growing plants, 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. 67). For 
small plants, as young 
potato tops, the lower tin 
disc which has a circular 
hole in the center, is laid 
inside, on the bottom of 
the box, and held in place 
by small lugs soldered to 
the wall as shown. When 
it is desired to spread the 
powder more, the other 
disc is used. 
For taller plants, a 
powder bellows is desir- 
Fic. 67. Sifting box, for applying powders. 
able. 
Liquids are best distributed with a force pump, fitted with 
a hose of a length suitable to the height of the tree or plant, 
and an atomizing nozzle (Figs. 68, 69, 70). For tall trees, 
the hose nozzle may be elevated by attaching it to the end 
of a light pole. 
Excellent bellows and force pumps, designed expressly 
for applying insecticides, are now manufactured. 
305. The Use of Insecticides. In treating any given 
insect, the most important question to decide, is the manner 
