Spraying Experiments in Nebraska 
97 
The results of the last three seasons indicate that while it is 
sometimes possible to omit either the fungicide or the insecti- 
cide in the first spray, or to omit the first spray altogether, without 
suffering serious loss, it is never safe to do so. It is more hazard- 
ous to omit the fungicide than the insecticide. The omission of 
the fungicide in 1915 would have been almost disastrous in the 
average orchard, and the omission of the insecticide would have 
meant the loss of several bushels of fruit out of every hundred 
bushels. 
There is no doubt that the beneficial effects of spraying are 
noticeable for more than a single season and that thoro spraying 
for a number of years will greatly lessen insect infestation and 
disease infection. 
Fig. 25 — An excellent type of pressure regulator 
It has been shown that clean culture is of paramount im- 
portance in controlling plum curculio and apple scab. 
The capacity of the spraying machine must be gauged by the 
size of the orchard and the length of time available for applying 
the petal-fall spray. The time from the falling of the petals to 
