30 



BULLETIN 564, U. S. DEPARTMENT OF AGRICULTURE. 



From this it is seen that the cost per acre ranged from 46 to 65 

 cents for picking in the different plats. Of course, the average per 

 picking increases as the season progresses, and consequently the 

 greater number of pickings cost more per picking.. The hours of labor 

 per acre ranged from 6.1 to 8.6. From the total cost figures it is seen 

 that the four pickings at an interval of one week cost $2.02, while 6 

 pickings at the same time interval cost $3.90. The six pickings given 

 twice a week cost $2.77. These records show a uniformly higher cost 

 for tfye pickings on Eureka than on Hecla, and, judging from the gen- 

 eral observations which have been made, it is probable that the 

 Eureka figures more nearly represent average conditions. 



The weevils collected from these plats at the various pickings are 

 shown in Table 25. 



Table 25. — Weevils collected per acre with bag-and-hoop, Eureka plantation. Tallulah, 

 La., 1916, experiment No. 1. 



Plat No. 



Pieking. 



Date. 



Number 

 of weevils 

 collected. 





(First 



June 13 10 





Second 



June 20 11 





Third 



June 27 25 





Fourth.. 



Julv 5 63 





Fifth 







July 11 82 





Sixth 



July 22 



470 





Total 









661 





First 



Second 



Third 



Fourth 



Fifth 



Sixth 



Total 







3 



June 13 

 June 17 

 June 20 

 June 23 

 June 27 

 June 30 



13 

 11 

 6 

 13 





'It 

 20 







'.-tn 





("First 









June 13 1 6 







June 20 ! 9 





Third 



June 27 27 



4 



Fourth 



July 5 43 







Total 





85 



From Table 25 it is seen that if the sixth picking in plat 2 is ex- 

 cluded, the highest number of weevils collected per acre at anypicking 

 was 82. However, there was a tremendous increase at the sixth pick- 

 ing of plat 2, and 470 weevils per acre were collected at this time. This 

 increase was due to the effect of climatic conditions on the multiplica- 

 tion of the weevils. As has been mentioned, the month of July was 

 exceedingly rainy, the plats being subjected to a shower almost every 

 day in the month. This, of course, produced a great reduction in the 

 climatic control of the weevils in the fallen forms and, as a result, 

 although the initial infestation of these plats was very light, the July- 

 bred weevils multiplied so rapidly that this was quickly changed to an 

 excessively heavy infestation. Considering the totals collected from 



