6 Department Circular 370, U. S. Dept. of Agriculture 
Taste 1.—Summary of the 1925 survey of 200 of the more important chestnut 
counties in the southern Appalachians 
Number of counties inspected 
Extent of blight 
cae pre 3) uns K North South T West 
infecte . en- to) ‘en- «agin 
Georgia | tucky | Carolina | Carolina| nessee | Virginia Virginia | Total 
No infection.._._.-.---- 3 8 0 0 1 0 0 12 
Less than 1 per cent... 3 14 0 0 14 5 4 40 
1 to 9 per cent.-..-.-..- 4 0 11 1 15 6 14 51 
10 to 29 per cent. 3 0 5 0 1 4 20 33 
30 to 79 per cent__- 2 0 7 2 1 6 8 2B 
80 to 100 per cent._ 0 0 1 1 0 27 9 38 
Total____---.---- 15 22 24 4 32 48 55 200 
There are prob- 
ably many inaccu- 
racies in these esti- 
mates. Some of the 
counties within the 
commercial range of 
chestnut (fig. 1) have 
not yet been inspect- 
ed. In most of those 
which were entered 
the inspection con- 
sisted of a single au- 
tomobile trip across 
the county, which af- 
forded a view of but 
a fractional part of 
the chestnut stand 
for the entire county. 
The necessary adher- 
ence to a county basis 
HE) 4044 50-100 %6 INFECTED IN 1924 did not increase the 
ES EXTENSION OF AQEA 010% WFECTED petnereo raja) accuracy of mapping 
== COMMERCIAL RANGE OF CHESTNUT the distribution of 
CaaecH 1928) (FOREST PaTMaLOer; SOA) the blight. The dis- 
Tic, 2.—Map forecasting 80 per cent chestnut-blight in- tribution presented 
"fection in the southern Appalachians “sar on the map 1s based 
merely upon the best 
averages available in March, 1926. The need for each individual 
owner of woodland to examine his chestnut stands and determine 
roughly the present status of blight in them can not be emphasized 
too strongly. 
FUTURE SPREAD OF THE BLIGHT 
In the early stages of infection the presence of blight in chestnut 
stands is not evident to the casual observer. At first, only a few of 
the smaller branches and sprouts are killed. A 1 per cent infection, 
for example, since it refers to the presence of one or more infections 
on one in every hundred chestnut trees, actually represents a dis- 
eased condition of a very small fraction of the total branch spread. 
