EXPERIMENTS FOR CONTROL. 
33 
stimulate the vines, causing them to put out some fresh foliage so 
that the loss in weight of the hops will not be so great as it would be 
otherwise. 
Fertilization. — In parts of the hopyards where the vines were very 
vigorous, as a result of fertilization, the presence of mites was not so 
noticeable as in parts where the foliage was not so dense. The 
increase of mites was just as rapid, however, and at the end of the 
season the densely foliaged vines were just as badly injured, and the 
Fig. 9.— Hopvine tied low and stripped; leaves readily sprayed. (Original.) 
hops in many cases were discolored. The denser foliage gives a 
larger surface to be injured, and with equal infestation plats with 
light foliage will necessarily be more seriously injured than the 
denser ones. 
Fertilization will increase the vigor and the productiveness of the 
hopvines and, while it will not in any way control the mites, it should 
be practiced on general principles. 
