CONTROL OF BOLL WEEVIL IN MISSISSIPPI DELTA. 



21 



man picked six. It was found that while the fast men took much 

 less time for a row than the slow one, they averaged 8.1 and 10.9 

 weevils to the row, whereas the slow one averaged only 4. Thus it is 

 seen that the efficiency of the individual largely determines not only 

 the speed of the operation, but also its thoroughness. This same 

 observation has been made a number of times and it was found that 

 the individuals varied even more widely than the figures just given 

 would indicate. 



The weevils collected at the various pickings are shown in Table 17. 



Table 17. — Weevils collected with bag-and-hoop, Hecla plantation experiment, Mound, 



La., 1916. 



Picking. 



Date. 



Number 

 weevils 

 collected. 



Weevils 

 per acre. 



First 



June 16 

 June 22 

 June 29 

 July 10 

 July 17 



185 

 178 

 160 

 159 

 163 



129 





124 



Third 



111 



Fourth 



110 



Fifth 



113 







Total 



847 



587 









From this it is seen that the pickings ranged from 110 to 129 

 weevils per acre, with a total of 587 weevils per acre for the five 

 pickings. It is interesting to note that the highest number was col- 

 lected at the first picking. The range, however, was comparatively 

 small. 



The forms collected in the bag-and-hoop are shown in Table 18. 



Table 18. 



-Forms collected per acre with bag-and-hoop, Hecla plantation experiment, 

 ■ Mound, La., 1916. 





Forms collected per acre. 



Clean. 



Punc- 

 tured. 



Date. 



Total. 



Clean. 



Punc- 

 tured. 





285 



346 

 414 

 894 

 506 



17 



45 



59 



355 



139 



268 

 301 

 355 

 539 

 367 



Per cent. 

 5.8 

 13.1 

 14.3 

 39.8 

 27.6 



Per cent. 

 94.2 



June 22 



86.9 



June 29 



85.7 



July 10 



60.2 



July 1 7 



72.4 







Total 



2,445 



615 



1,830 









25.2 



74.8 













At the first three pickings only squares were secured, but at the 

 fourth and fifth both squares and bolls were collected. A total of 

 2,445 forms were collected at the five pickings, of which 1,830 were 

 punctured and 615 were clean. Thus it is seen that practically one- 

 fourth of the forms collected in the bag-and-hoop were clean. While 

 making these collections it was noted also that a considerable number 

 of terminal buds were broken off and gathered in the sacks. 



