CONTROL OF BOLL WEEVIL IN MISSISSIPPI DELTA. 



Table 5. — Summary of fallen forms collected from picked plats, showing percentage 

 injured and clean, Eureka plantation, Tallulah, La., 1916. 



Plat No. 



Bolls. 



3,543 

 3,794 

 4,334 

 5,583 

 4,370 

 7,5(53 



Total 29,187 



Weighted average j . . . 



Clean. 



357 

 541 

 301 

 246 



150 

 731 



2,326 



10.0 

 14.3 

 7.0 

 4.1 



3.4 

 9.7 



7.9 



Injured. 



3,186 

 3,253 

 4,033 

 5, 337 

 4,220 

 6,832 



26, 861 



9 



85.7 

 93.0 

 95.9 

 96. 6 

 90.3 



92.1 



Squares. 



3,233 



4,884 

 4,135 

 4,697 

 6, 432 

 11,831 



35, 212 



Clean. 



189 

 367 

 216 

 192 

 274 

 622 



1,860 



5.2 



Injured. 



3,044 

 4,517 

 3,919 

 4,505 

 6,158 

 11,209 



33,352 



.1 

 92.5 

 94.8 

 95.9 

 95.7 



,7 



94.8 



Squares and bolls. 



6,776 

 8,678 

 8,469 

 10, 280 

 10, 802 

 19, 397 



Clean. 



546 

 908 

 517 

 438 

 424 

 1,353 



4,186 



7.6 

 10. 5 

 6.1 

 4.3 



4.0 

 7.0 



6. 5 



Injured. 



6,230 

 7,770 

 7,952 

 9,842 

 10,378 

 18,041 



60, 213 



92.4 

 89.5 

 93.9 

 95.7 

 96.0 

 93.0 



93.5 



Table 6. 



-Fallen forms collected at last three collections, Eureka plantation, Tallulah, 

 La., 1916. 



Date. 



Plat 1. 



Plat 2. 



Plat 3. 



Bolls. 



Squares. 



Total. 



Bolls. 



Squares. 



Total. 



Bolls. 



Squares. 



Total. 



July 31 



701 

 834 

 204 



692 



1,085 



442 



1,393 



1,919 



646 



836 

 942 

 431 



1,504 



1, 566 



750 



2,340 

 2,508 

 1,181 



1,203 

 816 



645 



957 

 1,007 

 1,224 



2,160 



Aug. 7 



1,823 





1,869 







Total 



1,739 



2,219 



3,958 



2,209 



3,820 



6,029 



2,664 



3,188 



5,852 







Date. 



Plat 4. 



Plat 5. 



Plat 6. 



Average check. 



Bolls. 



Squares. 



Total. 



Bolls. 



Squares. 



Total. 



Bolls. 



Squares. 



Total. 



Bolls. Squares. 



Total. 



July 31 



Aug. 7 



Aug. 14 



1,360 



885 

 647 



1,403 



1,044 

 843 



2,763 

 1,929 

 1,490 



986 

 769 

 492 



1,561 

 1,732 

 1,383 



2,547 

 2,501 

 1,875 



2,090 



1,177 



913 



3,536 

 2,645 



2,874 



5,626 

 3,822 

 3,787 



1,861 

 1,233 

 1,032 



3,081 



2,248 

 2,218 



4,942 

 3,481 

 3,250 



Total 



2,892 



3,290 



6,182 



2,247 



4,676 



6,923 



4,180 



9,055 



13,235 4,126 



7,547 



11,673 



Table 4 shows the plat totals of fallen forms at each of the pickings, 

 while Table 5 shows the total collections from each of the picked plats 

 throughout the season and indicates the percentages of clean and 

 injured forms in each lot. In order to facilitate comparison with the 

 checks, the last three collections of fallen forms have been isolated 

 and summarized in Table 6, together with the check records. 



From these tables it is seen that the total fallen forms collected in 

 the picked plats throughout the season ranged from 6,776 for plat 1 

 to 19,397 for plat 6. Thus it is seen that about three times as many 

 forms reached the ground in the plat picked once a week as in the 

 plat picked six times a week. 

 96828°— Bull. 564—17 2 



