16 
BULLETIN 1253, TJ. S. DEPARTMENT OF AGRICULTURE. 
Table 18. — Barrel crop, 1920; disease index for shipments from States where 
part went to southern inspection offices 1 and part to other offices of the inspection 
service. 
Southern offices. 
All other offices. 
State. 
Number 
of cars in- 
spected. 
Number 
of cars 
showing 
disease. 
Disease 
index. 2 
Number 
of cars in- 
spected. 
Number 
of cars 
showing 
disease. 
Disease 
index. 2 
3 
1 
4 
15 
1 
21 
15 
90 
29 
1 
1 
3 
14 
53.0 
31.0 
5.3 
9.8 
4 
35 
2 
28 
ICO 
Illinois. -. -- - - -- 
18.0 
31 
67 
543 
46 
100 
55 
20 
45 
362 
31 
84 
41 
8.0 
6.2 
12 
9 
80 
23 
21.0 
26.0 
27.6 
14.7 
11.6 
19.6 
18.4 
6. 5 
179 
143 
23.6 
881 
70 
613 
52 
12. 6 
Other States 2 .. . .. - . .. 
16.6 
i See footnote 1 to Table 15. 2 See footnote to Table 3. 
3 No shipments from these States were inspected at southern offices. 
It appears from Table 18 that for seven out of the nine States rep- 
resented, shipments which went to southern offices suffered most. 
Kentucky cars were inspected only at southern offices; of the Michi- 
gan cars only one was inspected at a southern office, and it showed no 
disease. Taking a general average for the nine States, the disease 
index for southern offices was 23.6; for all other offices, 12.6. 
ARKANSAS 
ILLINOIS 
VIRGINIA 
PENNSYVANIA 
NEW YORK 
WEST VIRGINIA 
MARYLAND 
AVERAGE 
ausft 
DISEASE 
INDEX 
53.0 
10.0 
10 
DISEASE INDEX 
20 30 40 
50 
3 1.0 
18.0 
27.6 
I 8.4. 
26.0 
1 9.6 
2 1.0 
I 1.6 
;:-.. 'y •• 1 
60 
w/////m 
W///S///////// ////////A 
'///////////////////////A 
V////////////{\ 
SOUTHERN OFFICES 
V////////\ ALL OTHER OFFICES 
2 3.6 
Fig. 4.— Barrel crop for 1920. Disease index for cars from seven States, part of which wore Inspected at 
southern inspection offices, and part at all other inspection offices. The percentages are calculated on 
the basis of all cars showing disease of any kind. 
It appears, further, from Tables 15 and 17 that differences in dis- 
ease index between southern offices and all other offices were greater 
in the barrel than in the box crop. (Compare 22.2 per cent at south- 
ern offices, and 15.4 per cent at all other offices for the barrel crop 
with 14.5 percent at southern offices, and 12 per cent at all other 
offices for the box crop.) 
There may be several reasons for the excess of disease in apples 
shipped to southern markets. Probably the most important one is 
