CONTROL OF PEACH DISEASES IN GEORGIA 5 
For 29 years, 1892 to 1920, the United States Weather Bureau has 
maintained climatological observations and records at Marshall ville, 
Ga., 7 miles from Fort Valley, and, like the latter, in the heart of the 
Georgia peach belt. Data from the Marshall ville records are there- 
fore equally available for the purposes of these experiments, with the 
added advantage that the mean temperatures and precipitations for 
each month of the year, and for the year as a whole, derived from the 
records for the 29 years, afford satisfactory climatic data for use as 
normal or standard. In Table 2, therefore, are shown the mean 
temperature and the precipitation for each month of the year in 
each of the years 1921, 1922, 1923, and 1924, together with the means 
for each month, and for the year as a whole, derived from the observa- 
tions for 29 years recorded at Marshall ville. 
The Marshallville data for the several months have been translated 
into graphical terms in Figures 1,2,3, and 4, there being one diagram 
for each of the four seasons covered by the study. The mean tem- 
perature and the total precipitation for each month is denoted by the 
location of a dot, as referred to the scale of temperature, at the left, 
and that of precipitation at the bottom of each graph. The dots 
denoting the 29-year means for the consecutive months are connected 
by a solid line, representing the normal values for the 12 months of 
the year, and this curve is shown without change in each figure. The 
dots for the consecutive months in each of the four years are con- 
nected by a broken line, each in its respective figure. With these 
curves the eye can readily compare each season with the others and 
with the normal. 
Table 2. — Precipitation and monthly mean temperatures, Marshallville, Ga.; means 
for 29 years, 1892 to 1920, and by months, for 1921, 1922, 1923, and 1924 («§) 
1892 to 1920 
1921 
1922 
1923 
1924 
Month 
Mean 
tem- 
pera- 
ture 
Mean 
pre- 
cipita- 
tion 
Mean 
tem- 
pera- 
ture 
Mean 
pre- 
cipita- 
tion 
Mean 
tem- 
pera- 
ture 
Mean 
pre- 
cipita- 
tion 
Mean 
tem- 
pera- 
ture 
Mean 
pre- 
cipita- 
tion 
Mean 
tem- 
pera- 
ture 
Mean 
pre- 
cipita- 
tion 
January - 
o F 
47.8 
49.0 
58.1 
64.4 
73.4 
79.3 
80.9 
80.5 
76.2 
66.0 
55.6 
48.1 
Inches 
4.42 
5.91 
5.47 
4.30 
3.21 
4.14 
6.04 
5.04 
3.07 
2.92 
3.07 
4.44 
o p 
51.3 
52.6 
66.3 
65.0 
71.3 
81.8 
80.8 
80.8 
83.5 
65.5 
60.2 
53.8 
Inches 
2.04 
3.67 
1.18 
4.82 
4.49 
2.15 
10.46 
2.63 
2.45 
2.14 
4.13 
1.76 
o p 
48.0 
57.5 
58.2 
68.4 
73.2 
80.2 
81.4 
79.0 
77.6 
67.5 
59.4 
56.0 
Inches 
4.96 
5.73 
12.31 
1.63 
8.24 
6.87 
3.36 
5.83 
2.-53 
2.84 
.82 
7.11 
° F. 
53.0 
51.3 
59.6 
65.4 
71.0 
77.0 
80.4 
81.6 
78.5 
67.5 
54.1 
56.8 
Inches 
7.41 
5.25 
8.87 
3.71 
12.85 
5.54 
4.44 
4.43 
1.14 
T. 
2.78 
3.69 
F. 
44.4 
48.4 
53.4 
64.6 
70.4 
81.4 
81.0 
83.0 
73.0 
63.6 
57.2 
52.0 
Inches 
6. 11 
February 
March ._ .. . 
6.19 
3.98 
4.98 
May 
3.76 
June.. ... 
7.28 
July 
8.09 
3.30 
9.83 
.97 
1 23 
7.71 
Mean temperature for 
year.. . 
67.7 
67.2 
66.4 
64.4 
Total precipitation 


41.92 
...... 
62.23 
60.11 
63.43 
1 
It may be seen from Table 2 and Figure 1 that the spring of 1921 
was warmer than the normal spring, with less than normal precipita- 
tion. In the Georgia peach belt these conditions, especially during 
the month of March, promote the early emergence of the adult 
curculios from hibernation. When the curculio gets an early start 
