Mar. 6 , 1917 
Little-Leaf of the Vine 
383 
the worst vines. It is evident that the disease has killed many. Badly 
diseased vines represent 43.7 per cent, slightly diseased 13.7 per cent, 
and healthy vines 22.3 
per cent. Such a vine¬ 
yard would yield only 
about one-fourth of a 
normal crop. 
CHARACTER OR THE 
SOIIy 
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Typical or serious 
cases of little-leaf 
have been noted only 
in sandy or sandy-loam 
soils. If one passes 
through an infected 
region, the disappear¬ 
ance of the disease 
with a change from 
sandy to clay soil is 
very noticeable. The 
few cases in which the 
symptoms of little-leaf 
have been noted on 
vines growing in heavy 
soils do not seem to be 
typical and can prob¬ 
ably be attributed to 
the soil of old sheep 
camps, which affects 
both vines and fruit 
trees in a similar way. 
Perfectly healthy 
vines are found grow¬ 
ing in sandy soil which 
on superficial inspec¬ 
tion seems to be iden¬ 
tical with adjoining 
soil where the vines 
are diseased. The 
soils in cases of this 
kind were examined 
in the attempt to de¬ 
termine whether any 
chemical or physical differences could be found which might account for 
the disease. 
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••HEALTHY ••slightly diseased 
••badly diseased 
Fig. i.— Diagrams of the distribution of grapevines affected with 
little-leaf: A, Moderately affected vineyard; B, a very badly 
affected vineyard. 
