Spraying Experiments in Nebraska 
13 
The weather conditions were not quite normal in 1913. There 
was a great deal of rain very early in the season, but after the 
middle of June very little rain fell at Wymore, Brownville, or 
Lincoln. Conditions were better at Florence, but even there the 
rainfall was below normal. The hot, dry weather during the latter 
part of the season caused a heavy dropping of fruit, even where 
there was no injury. 
In every case lime sulphur was used in combination with 
arsenate of lead, altho it does not appear in the schedules for 
codling moth. Also, in all cases 45° angle nozzles were used. 
Table 1 — Wymore spray schedule 
Date 
Spray 
April 21 
Cluster-bud 
May 5 
Petal-fall 
May 22 
2-weeks 
July 2 
Second-brood 
Plat 1 
Pb-2-50 
Pb-2-50 
Pb-2-50 
Pb-2-50 
Codling moth injury on windfalls and picked fruit 
Varieties 
Plat 
Total fruit 
Codling moth 
Per cent 
Ben Davis f 
Winesap \ 
Jonathan [ 
1 
check 
10,472 
2,203 
1,148 
1,080 
10.96 
49.02 
At Wymore (table 1) during this season, a double acting hand 
pump similar to fig. 19 with two medium mist nozzles was used. 
At the petal-fall spray a pressure of 160 pounds was maintained. 
Considering the percentage of codling moth in the check plat as 
100 per cent, this schedule was approximately 78 per cent efficient. 
The fact that 22 per cent of the "worms" found in the apples entered 
at the calyx indicates that the poison was not forced into all of them. 
This orchard had not been thoroly sprayed prior to this time. 
Table 2 — Nemaha spray schedule 
Date 
Spray 
April 23 
Cluster-bud 
May 7 
Petal-fall 
May 30 
3-weeks 
July 3 
Second-brood 
July 25 
Third-brood 
Plat 1 
Pb-2-50 
Pb-2-50 
Pb-2-50 
Pb-2-50 
Pb-2-50 
Pb-2-50 
Pb-2-50 
Pb-2-50 
2 
Pi3-2-50 
