4 BULLETIN 1482, U. S. DEPT. OF AGBJCULTUBE 
each of the years 1921 to 1924, inclusive, expressed as a percentage, 
was, respectively, 100, 61, 39, and 30. 
The yearly infestation of the curculio in Elberta orchards will 
fluctuate with the variation year by year, influenced largely by 
climatic conditions, in the number of generations of the insect in 
the South. An explanation is found in the fact that when there 
are two broods of larvae in a year the second brood will make its 
appearance in numbers at the time of the harvest of Elbertas. Thus, 
in 1921, 1922, and 1924, years in which there were two generations 
of the curculio in Georgia, the infestation was much heavier in the 
Elberta orchards than it was in 1923, when there was only one 
generation. A partial third generation of the insect was reared in 
the insectary in 1922. Again, assuming the severest infestation 
in any of the four years as 100 per cent, the relative abundance of 
the curculio in the Elberta experimental orchards for each of those 
years, taken in order and expressed as a percentage, was, respec- 
tively, 100, 99, 35, and 95. 
CLIMATIC CONDITIONS AND CURCULIO BEHAVIOR 
Climatic conditions have considerable influence on the develop- 
ment of the curculio and the severity of its infestations. It there- 
fore may be of interest to tabulate the weather conditions that 
prevailed during the four seasons at the locality where the experi- 
ments were conducted, and to consider them in connection with the 
recorded activities of the curculio for the same seasons. Table 1 
presents the mean temperature and the precipitation at Fort Valley 
for each of the nine months of February to October, inclusive, and 
the mean temperature and total precipitation for the duration of 
the nine months, in each of the four years of the experiments here 
reported. The " season" consisting of these nine months covers 
the entire range of the activity of the curculio in central Georgia. 
Of the four seasonal mean temperatures, that for 1921 was highest, 
and that for 1922 almost as high; these were the years in which two 
full generations of the curculio appeared. 
Table 1. — Precipitation and monthly mean temperatures, Fort Valley, Ga., February 
to October, 1921, 1922, 1923, and 1924 (8) 
1921 
1922 
1923 
1924 
Month 
Mean 
temper- 
ature 
Pre- 
cipita- 
tion 
Mean 
temper- 
ature 
Pre- 
cipita- 
tion 
Mean 
temper- 
ature 
Pre- 
cipita- 
tion 
Mean 
temper- 
ature 
Pre- 
cipita- 
tion 
°F. 
51.4 
64.9 
64.4 
71.0 
81.2 
80.0 
79.8 
82.4 
64.8 
Inches 
2.77 
1.10 
3.10 
3.80 
2.91 
8.24 
4.31 
1.80 
2.21 
°F. 
56.9 
58.0 
68.0 
72.5 
80.0 
80.6 
78.8 
77.2 
66.5 
Inches 
4.67 
9.73 
2.63 
5.90 
3.74 
5.95 
4.28 
2.63 
2.91 
°F. 
49.4 
57.8 
64.4 
69.5 
76.3 
79.7 
80.8 
77.0 
65.3 
Inches 
3.87 
7.51 
3.27 
9.71 
5.99 
2.64 
5.00 
2.83 
.46 
°F. 
47.3 
52.6 
63.5 
69.8 
80.4 
80.0 
82.6 
71.7 
63. 4 
Inches 
5.15 
March . --- - 
3.37 
April - .- -.- - - 
4.79 
3.94 
June . 
July 
4.93 
6.18 
1.39 
11.25 
.81 
Mean temperature for season. _. 
71.1 
70.9 
68.9 
67.9 
30.24 
1 42.44 
1 

41.28 
41.81 
