Dec. 15, 1923 
Control of Apple Scald 
535 
Table IX. —Critical periods in the development of apple scald as shown by results 
from oiled wrappers applied at different times in storage season —Continued 
Description of apples and wrappers. 
Rome Beauty, Wenatchee, Wash., etc.—Continued. 
Unoiled wrapper applied at picking time and re¬ 
moved and replaced. 
Do. 
From unoiled wrapper applied at picking time to 
No. 4a. 
Do. 
From mineral oil wrapper No. 4a applied at picking 
time to unoiled wrapper. 
Do. 
Stayman Winesap, Wenatchee, Wash.; picked Oct. 9, 
1920; notes taken May 23,1921: 
Unoiled wrapper. 
Mineral oil wrapper No. 3a. 
From unoiled wrapper applied at picking time to 
No. 3a. 
Do. 
Do. 
Do. 
From mineral oil wrapper No. 3a applied at picking 
time to unoiled wrapper. 
Do. 
Do. 
Do. 
Winesap, Wenatchee, Wash.; picked Oct. 25, 1920; 
notes taken June 20, 1921: 
Unoiled wrapper. 
Mineral oil wrapper No. 3a. 
From unoiled wrapper applied at picking time to 
No. 3a... 
Do. 
Do. 
Do. 
From mineral oil wrapper No. 3a applied at picking 
time to unoiled wrapper. 
Do. 
Do. 
Do.. 
Wrappers applied. 
Degree of 
scald 
manifest 
after 
storage. 
Per cent. 
Dec. 1, 1921. 
24 
Jan. 2, 1922. 
I S 
Dec. 1, 1921. 
0 
Jan. 2, 1922. 
2 
Dec. 1, 1921. 
7 
Jan. 2, 1922. 
0 
At picking time.. 
16 
.do. 
0 
Nov. 20, 1920. . .. 
0 
Dec. 8 , 1920. 
11 
Jan. 10, 1921. 
3 
Feb. 25, 1921.... 
7 
Nov. 20, 1920.... 
3 
Dec. 8 , 1920. 
0 
Jan. 10, 1921.... 
0 
Feb. 25, 1921.... 
0 
At picking time.. 
9 
.do . 
0 
Dec. 20, 1920.... 
0 
Jan. 21, 1921.. . . 
1 
Feb. 25, 1921 
2 
Apr. 4, 1921. 
4 
Dec. 20, 1920.... 
0 
Jan. 21, 1921. 
0 
Feb. 25, 1921 
0 
Apr. 4, 1921. 
0 
All of the repacking was done in the cold storage rooms and it was not 
believed that the apples received enough aeration during the exchange 
of wrappers to materially influence the development of scald, but this 
point was definitely tested with one lot of Rome Beauty. The unoiled 
wrappers were removed and the apples repacked in the same wrappers 
without securing scald control, while similar apples repacked in oiled 
wrappers were free from scald at the end of the storage period. 
The results of the experiments reported in Table IX have a practica, 
value in showing that where apples are stored in orchard boxes and 
packed out later, the oiled wrappers can still be used to advantage in 
scald control. They are of general pathological interest because of the 
light they throw on the cumulative nature of a physiological disease, 
and they are in agreement with the experiments on aeration reported 
in earlier publications in showing that the development of scald can be 
divided into several fairly distinct periods or stages. 
The first period in the development of apple scald begins with the 
picking of the fruit and, with the more susceptible varieties, ends with 
