Mar. 6,1917 
Little-Leaf of the Vine 
387 
Table II .—Percentages of coarse material and of water in soil —Continued 
S. VINEYARD (TYPE OP ATTACK INTERMEDIATE BETWEEN THE INTENSIVE AND THE DIFFUSIVE. MORE 
SEVERE than w., LESS than m.)— continued 
June. 
Do. 
Do. 
Do. 
Do. 
Do. 
Do. 
Do. 
Do. 
Do. 
Do. 
Do. 
Means 
Depth. 
Coarse material. 
Moisture. 
D 
H 
D-H 
Di 
Hi 
Di- 5 -Hi 
Feet . 
1 
34*04 
21.65 
12.39 
2.00 
7.20 
2 
33 * 0 $ 
ai *45 
it. 60 
3*87 
8. 72 
3 
38 * 39 
24.08 
i 4 * 3 i 
5 - 47 
11.08 
4 
40.65 
18.15 
22, 50 
7 - 76 
12. 56 
1 
28. 22 
23. 76 
4.46 
3*36 
4*90 
2 
33*90 
* 24*43 
9 - 47 
4*48 
6.46 
3 
36.36 
29-00 
7 * 36 
6.11 
8.82 
4 
35*03 
27*55 
7.48 
8.38 
12.37 
I 
29.02 
22. 22 
6.80 
2.87 
4-67 
2 
31*52 
22.85 
8.67 
4.08 
5*94 
3 
33*07 
23*50 
9-57 
5 * 75 
8.63 
4 
38.83 
28. 42 
10.41 
7*36 
XI. 60 
34 * 34 
23.92 
10. 42 
5*12 
8. 58 
59*7 
In every case where the vines were diseased the soil shows more coarse 
material than the companion soil, where the vines were healthy. This is 
true in every vineyard examined and at all depths . a This uniformity 
indicates strongly a connection between the disease and the coarseness 
of the soil. That the coarse material is not alone responsible is shown by 
the fact that in the W. vineyard diseased vines were found where the pro¬ 
portion of coarse material was only 29.77 P er cent, while in the M. vine¬ 
yard healthy vines were growing in soil containing 47.43 per cent. It is to 
be noted, however, that the intensity of the disease is in proportion to the 
coarseness of the soil, both when we compare soils from different vine¬ 
yards and where we compare soils from different parts of the same vine¬ 
yard. The difference between the coarse material in the diseased parts 
of the vineyard and in the healthy parts (D — H, Table III) is roughly a 
measure of the intensity of the disease. Vineyard K. is a special case. 
The difference D — H is small, but the diseased vines were very badly 
affected. There were, however, but a few single vines or groups of two 
or three vines affected and all the rest appeared perfectly healthy. 
Table III. —Percentage of coarse material in diseased and in healthy portions of vineyard 
{summarized from Table II) 
Vineyard and character of attack. 
Percentage of coarse material. 
Diseased. 
Healthy. 
D-H. 
M. Attack diffusive; severe.. 
63.84 
36.16 
29. 77 
21. 26 
47*43 
25*35 
24*39 
17. 92 
16.41 
10. 81 
5* 38 
3* 34 
S. Attack intermediate; moderately severe. 
W. Attack diffusive; not severe. 
K. Attack intensive; very few vines affected, but these badly. 
® Of 129 pairs of samples examined, there were only 3 exceptions, and these apply to only a single foot 
and not to the whole soil depth. 
