CONTROL OF BOLL WEEVIL IN MISSISSIPPI DELTA. 7 



lected in the bags were clean. Of course, some of these forms may 

 have belonged to the class which shed normally for physiological 

 causes, but this proportion seems to be very undesirably high. 



The fact that the squares collected in plat 1 numbered only two 

 and one-half times as many as in plat 6, in spite of the fact that 

 the former was picked six times as often as the latter, is of interest. 

 This shows that a picking at a weekly interval secures more than 

 that day's pro rata of the squares due to fall. 



FALLEN FORMS COLLECTED. 



As a check on the relative number of forms collected in the bags, 

 the number of forms falling to the ground in each row was also deter- 

 mined. To accomplish this all forms were picked from the ground 

 once a week, beginning June 29. These were examined and sorted 

 into bolls and squares, clean and injured. This sorting was continued 

 until July 31, when it was found that so nearly all fallen forms were 

 injured that they were divided only into bolls and squares. Unfor- 

 tunately, the forms were not collected from the ground in the checks 

 for the first four weeks. On July 25, however, all forms were cleared 

 from the ground in the checks, and these two plats were included 

 in the last three pickings. This makes it necessary to consider only 

 these three pickings when comparing the picked plats with the checks. 



Table 3. — Forms collected in bags averaged by pickings, Eureka plantation, Tallulah, 



La., 1916. 





Times 

 picked. 



Bolls collected. 



Squares collected. 



Total forms col- 

 lected. 



Plat No. 



Total. 



Average 



per 

 picking. 



Total. 



Average 



per 

 picking. 



Total. 



Average 



per 

 picking. 



1 



54 

 45 

 36 

 27 



18 

 9 



2,749 

 1,863 

 1,611 

 1,423 

 612 

 339 



51 

 41 

 45 

 52 

 34 

 37 



4,266 

 4,517 

 4,457 

 2,816 

 2,554 

 1,834 



79 

 100 

 123 

 104 



142 

 204 



7,015 

 6,380 

 6,068 

 4,239 

 3,166 

 2,173 



130 



2 



3 



141 

 168 



4 



156 



5 



6 



176 

 241 







