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 

 planting 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 



Erobable also that weevil injury caused the shedding of many late 

 oils 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 





Date planted, 1923 



Block 



Row 



Number of plants 



Yield of seed cotton 

 (pounds) 



Section 

 A 



Section 

 B 



Per 

 row 



Section 

 A 



Section 

 B 



Per 

 row 



Apr. 19 





1 

 2 

 3 



4 









8.25 

 6.75 

 6.25 

 5.44 



10.00 

 8.00 

 8.12 



7.25 



18.25 





1 









14.75 











14.37 











12.69 















li 



198 

 182 

 205 

 189 



194 

 193 

 198 

 197 



392 

 375 

 403 

 386 



5.87 

 6.00 

 4.75 

 4.82 



7.87 

 7.75 

 7.12 

 7.21 



13.74 

 13.75 

 11.87 

 12.03 



Block total-. 





774 



782 



1,556 



21.44 



29.95 



51.39 





2 









9 

 10 



194 

 190 



185 

 197 



379 

 387 



5.00 

 5.00 



6.56 

 7.50 



11.56 

 12.50 



Apr. 28 



1 



137 



163 



300 



2.06 



4.75 



6.81 





li 



126 

 138 

 162 

 131 



135 

 147 

 172 

 154 



261 

 285 

 334 



285 



2.19 

 3.12 

 3.58 

 3.31 



5.25 

 6.25 

 5.94 

 5.64 



7.44 

 9.37 

 9.52 

 8.95 



Block total. 





557 



608 



1,165 



12.20 



23.09 



35. 28 













6 



149 



172 



321 



4.00 



5.62 



9.62 



May 5 



1 



170 



187 



357 



3.25 



5.00 



8.25 





3 



li 



108 

 185 

 188 

 195 



177 

 186 

 193 

 181 



345 

 371 

 381 

 376 



3.70 

 3.44 

 4. 52 



3.87 



5. 79 

 4.69 

 5.12 

 4.18 



9.49 

 8.13 

 9.64 

 8. 05 



Block total 





736 



737 



1,473 



15.53 | 19.78 



35.31 







o 



170" 



IK'.! 



359 



4. 00 4. 12 



8. 12 



