12 
BULLETIN 1253, U. S. DEPARTMENT OF AGRICULTURE. 
A comparison between the disease indices of varieties ordinarily 
not stored at all and those stored either for long or for short periods 
is given in Table 9. 
Table 9. — Disease indices for varieties ordinarily not stored at all and for those 
stored for either long or short periods. 
Varieties usually not stored. 
Varieties stored. 
Classification. 
Number 
of 1 Cars, 
varieties. 
Disease 
index. 
Number 
of 
varieties. 
Cars. 
Disease 
index. 
2 
5 
88 
4.4 
5.6 
22 
18 
2,996 
898 
11. 7 
Barrel crop 
5 
17.7 
Total or average . . 
93 
5.3 
! 3.894 ! 13.1 
The differences shown in this table are great enough to establish 
and emphasize the fact that the amount of disease appearing in a 
lot of apples depends very largely on the length of time during which 
it is stored. This is also borne out by the rot and scald figures and 
the disease indices for both crops, by months (Tables 4 and 5), and 
by the fact that as the storage season progresses (from November on, 
for both crops combined) the proportion of cars showing disease, as 
compared with total cars inspected, grows constantly larger. (See 
Table 10 for the 1920 crop.) The date of packing may be of some 
significance, though if varieties are picked and packed early they are 
generally marketed early. Their storage season is thus no longer 
and, in fact, is usually shorter than that of midseason or late varieties. 
Frequently they are not stored at all. 
Table 10. 
Percentage of cars showing disease, by months, crop of 1920, calculated 
on the basis of total cars inspected each month. 
Month. 
Barrel 
crop. 
Box crop. 
Barrel 
and box 
crop com- 
bined. 
July 
August 
September 
October 
November 
December 
January 
February 
March 
April... 
May. 
June.. 
- 
Per cent. 
79.5 
73.6 
64.4 
71.6 
55.9 
70.3 
74.8 
81.2 
82.7 
84.6 
100.0 
100.0 
Per cent. 
71.5 
21.4 
16.3 
25.0 
29.8 
36.8 
70.5 
83.2 
93.7 
Per cent. 
7S.0 
72. 7 
63.6 
48.2 
35.5 
36.8 
43.0 
54.0 
73.4 
83.7 
94.3 
96. 8 
51.4 
58.2 
BOX CROP: DISEASE BY STATES. 
Little is noteworthy here (Table 11) except that of the States 
which were represented by more than 100 cars — Idaho, Oregon, and 
Washington, total 3,517 cars — Idaho showed approximately a half 
more rot and a slightly larger disease index than either Oregon or 
Washington. 
