94 Nebraska Agricultural Exp. Station, Research Bui. 10 
In computing the value, the actual selling price of the fruit 
was taken. The culls were not considered since they were not 
sold. The net gain per tree from spraying these plats may be 
found as follows: 
Plat 1— Total value of fruit $12.05 
Value of fruit on check plat 2.28 
Difference 9.77 
Cost of spraying 29 
Net gain from spraying 9.48 
Plat 2— Total value of fruit 7.47 
Value of fruit on check 10 
Difference 7.37 
Cost of spraying 25 
Net gain from spraying 7.12 
Plat 3— Total value of fruit 14.63 
Value of fruit on check 40 
Difference 14.23 
Cost of spraying 26 
Net returns from spraying 13.97 
Plat 4— Total value of fruit 10.59 
Value of fruit on check 21 
Difference 10.38 
Cost of spraying 24 
Net gain from spraying 10.14 
Plat 5— Total value of fruit 26.31 
Value of fruit on check 5.66 
Difference 20.65 
Cost of spraying 25 
Net gain from spraying 20.40 
Plat 6— Total value of fruit 17.55 
Value of fruit on check 2.14 
Difference 15.41 
Cost of spraying 26 
Net gain from spraying 14.15 
The above yields no doubt appear high, and would be high 
were we considering the average of the whole orchard, but it 
must be remembered that the trees under observation were 
chosen because of their uniformly good state of health, shape, 
size, and fruitfulness. Considering all the trees in the various 
orchards, the net gain per tree on the sprayed portions was 
approximately one-half the amount shown above. 
GENERAL SUMMARY AND RECOMMENDATIONS 
Three sprays are required during a normal season to control 
an ordinary infestation of codling moth. The first spray should 
be applied immediately after two-thirds to three-fourths of the 
petals have fallen. The spray should be applied as a coarse 
mist, directly against the face of the open calyces. In order to 
apply the spray properly the greater part of the spraying should 
