a COTTON IN WEEVIL-CONTROL EXPERIMENTS 19 
for the weevils to work upon, there is less injury to the bolls, though 
the fact that from 7 to 9 per cent of the locks on early bolls were 
damaged shows that the presence of squares is not a complete pro- 
tection against weevil attack. The greater injury to the later bolls 
_ corresponds to the heavier infestation of weevils in the latter part 
of July and to the fact that there were very few squares on the plants 
at that time. 
The increase of about 12 per cent in the injury to bolls in the 
lanting of May 12, as compared with that of May 5, as shown in 
| Table 11, is due to the fact that practically all the bolls produced 
in the last planting were from flowers appearing after July 8, so that 
most of the bolls in this planting were immature when the weevil 
_ infestation reached its peak during the latter part of July. It is 
_ probable also that weevil injury caused the shedding of many late 
| bolls that otherwise might have been retained and developed to 
maturity. 
YIELDS FROM SUCCESSIVE PLANTINGS AT SAN ANTONIO 
During the first week in August the first open bolls were found 
on the plantings of April 19, April 28, and May 5. Although there 
was little difference in the time when the first open bolls appeared 
on these three plantings, that of April 19 matured the bulk of its 
crop sooner than the others. This was in accord with the larger 
number of early flowers produced by the first planting. The entire 
crop of all plantings had matured by September 10, but the scarcity 
of labor delayed picking until September 19. 
TaBLE 12.—Yield of seed cotton from successive plantings at San Antonio 
Number of plants Yield Ces cotton 
Date planted, 1923 Block 
Section! Section| Per | Section! Section 
A TOW A B 
EN Bk ge ee fe eae! eae a le ec (Oe eee ee ae .25 | 10.00 
sen eel |S ae cae | SE a 6. 75 8. 00 
Se a ed is See (Ee Soh 6. 25 8. 12 
oe ee See io a, 5. 44 7. 25 
194 392 5. 87 7. 87 
193 375 6. 00 7. 75 
198 403 4.75 7. 12 
197 386 4. 82 7. 21 
782 | 1,556 | 21.44 | 29.95 
185 379 | 5.00 |: 6:56 
197 3871 5.00 | 7.50 
163 300 2. 06 4.75 
135 261 2.19 5. 25 
608 | 1,165 | 12.20] 23.09 
172 321| 4.00! 5.62 9. 62 
187 307 | 3.25 5. 00 | 8. 25 
177 345 | 3.7 5.79 9. 49 
186 371 3. 44 4.69 Sais 
193 381 4.52 5. 12 9. 64 
181 376 | 3.87 4.18 8. 05 
737 | 1,473 | 15.53 | 19. 78 |__ 35.31 
189 309 4. 00 4.12 8.12 
SCN > - 
