COTTON IN WEEVIL-CONTROL EXPERIMENTS 4] 
The uniformity of yields from plats 5 to 9 are shown by the graphic 
presentation of row yields, Figure 10. 
ADVERSE CONDITIONS AT GAINESVILLE, FLA. 
A series of successive plantings and a separate late planting similar 
_ to the experiments in Texas and South Carolina were also located at 
Gainesville, Fla., in cooperation with the Agricultural Experiment 
Station of the University of Florida, but owing to very adverse sea- 
sonal conditions the comparisons could not be carried out as at the 
other locations. The soil upon which these plantings were made is 
of a light sandy character with a subsoil not retentive of water. 
Owing to the lack of fertility in this soil cotton production is largely 
dependent upon the use of commercial fertilizers. | 
Extremely dry weather through March and April delayed germina- 
tion and caused poor stands and was followed by excessive rainfall 
during May and June. From May 15 until July 4, a period of 51 
days, rainfall was recorded on 44 days, the total precipitation being 
19.37 inches. Owing to this excessive rainfall the fertilizer was 
leached from the soil and plant growth was greatly retarded. Even 
the earliest planted cotton reached a height of only 12 to 18 inches, 
and the growth of the late-planted cotton was so checked that many 
plants never reached the fruiting stage. 
Weevils were present in the successive plantings before squares 
appeared on the plants. Squares appeared on the early plantings 
during the latter part of May, and on June 6 they were removed 
from the plants and poison was applied. The method of stripping 
and poisoning was the same as that used in Texas and South Carolina. 
Records of weevil emergence from hibernation are maintained by 
the experiment station. An abnormally high percentage of hiber- 
nated weevils survived the winter of 1922-23, and emergence con- 
tinued over an unusually long period. Only about 6 per cent of the 
weevils placed in hibernation cages normally survive the winter. On 
June 6, when the squares were removed from the plants in the suc- 
cessive planting test, 22.6 per cent of hibernated weevils had emerged. 
Emergence continued until July 31, at which time 26.86 per cent of 
the weevils placed in hibernation cages had emerged. 
As a result of this prolonged period of emergence cotton became 
reinfested with weevils after the squares had been removed and 
poison appled. On July 2, however, the average infestation of 
squares on all cotton planted at the experiment station was only 3.24 
percent. This indicated that square removal and poisoning had been 
effective in delaying the appearance of the new generation of weevils, 
aeaieks the conditions were such that no significant data could be 
secured. 
SUMMARY 
In the season of 1923 four successive plantings of cotton were made 
at San Antonio, Tex., Charleston, S. C., and Gainesville, Fla., to 
compare the growth and fruiting habits of the plants as affected by 
the time of planting. : 
The successive plantings were treated for control of overwintered 
weevils by removing and destroying early squares, followed by an 
application of calcium arsenate. At San Antonio a separate late 
