18 Nebraska Agricultural Exp. Station, Research Bui. 10 
cent of the larvae entered at the calyx in spite of the careful spray- 
ing with Bordeaux nozzles. This was due in part to the rapid 
closing of the calyces during the extremely hot weather that pre- 
vailed, and in part to delay caused by an accident to the machine 
which made the application later than it should have been. 
Table 7 — Lincoln spray schedule 
Date 
Spray 
April 25 
Cluster-bud 
May 15 
Petal-fall 
June 15 
25-days 
June 30 
35-days 
July 14 
2d-brood 
Aug. 14 
3d-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 
Pb-2-50 
2 
Pb-2-50 
Pb-2-50 
3 
Pb-2-50 
Pb-2-50 
Pb-2-50 
Pb-2-50 
4 
Pb-2-50 
Pb-2-50 
Pb-2-50 
Pb-2-50 
Pb-2-50 
Pb-2-50 
5 
Pb-2-50 
Pb-2-50 
6 
Pb-2-50 
Codling moth injury on windfalls and picked fruit 
Variety 
Plat 
Total fruit 
Codling moth 
Per cent 
1 
22,681 
17,573 
77.48 
2 
21,086 
14,587 
69.17 
Ben Davis ^ 
3 
21,774 
13,122 
60.27 
Jonathan 
4 
29,688 
17,035 
57.38 
5 
24,140 
5,819 
24.10 
6 
19,233 
3,453 
17.95 
check 
14,186 
13,322 
93.91 
At Lincoln (table 7), a power machine of 10-gallons-to-the- 
minute capacity was used. Mist nozzles were used for the petal- 
fall spray and a pressure of 200 to 225 pounds was maintained. 
The efficiency of the spray schedule for plat 6 was 81 per cent and 
for plat 5, 75 per cent. The schedules for all the remaining plats 
were below 50 per cent, that of plat 1 being only 18 per cent. 
A little more than 30 per cent of the larvae in the fruit entered 
at the calyx. The fact that a high wind was blowing at the time of 
the petal-fall spray, making it impossible to spray except from one 
direction, may account for the high percentage of calyx worms. 
However, by far the greater percentage of injury was from worms 
entering the sides of the apples during August and September. 
That the greater part of the damage was done by late ''worms" is 
shown by the high percentage controlled by the last three sprays. 
The results of the year's work again indicate that the petal- 
fall spray was not thoro enough. The poor results of this spray 
were doubtless due to the extremely rapid reproduction of the 
moths which escaped poisoning at that time. Considering the 
number of "worms" which entered the fruit at the calyx and the 
number which entered the fruit thru this point on unsprayed trees, 
the efficiency of the calyx application was slightly above 55 per cent. 
I 
