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 the 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 

 June 20 

 June 27 

 July 5 

 July 11 

 July 22 



10 







11 





Third.... ....... 



25 





Fourth 



63 





Fifth 











Sixth 



470 





Total 









661 





(First 









June 13 

 June 17 

 June 20 

 June 23 



13 







11 





Third 



6 





Fourth 



13 





Fifth 











Sixth 





20 





Total 











90 





[First 









June 13 

 June 20 

 June 27 

 July 5 



6 







9 





Third 



27 





Fourth 











Total 









S5 











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 



