6 



BULLETIN 564, U. S. DEPARTMENT OE AGRICULTURE. 



Table 2. — Total number of forms collected in bags and percentage injured, Eureka 

 plantation, Tallulah, La., 1916. 





Bolls. 



Squares. 



Total 



bolls 



and 



squares 



col- 

 lected. 



Plat No. 



Clean. 



Weevil 

 punctured. 



Other in- 

 jury. 



Total 

 num- 

 ber 

 col- 

 lected. 



Clean. 



Weevil Other in- 

 punctured, jury. 



Total 

 col- 

 lected. 





To- 

 tal. 



Per 



cent. 



To- 

 tal. 



Per 



cent. 



To- 

 tal. 



Per 

 cent. 



To- 

 tal. 



Per 



cent. 



To- 

 tal. 



Per To- 

 cent., tal. 



Per 

 cent. 



1 



1,224 



44.5 

 42.9 

 37.9 

 44.4 

 28.1 

 35.7 



770 

 577 

 481 

 422 

 246 

 118 



28.0 

 31.0 

 29.8 

 29.7 

 40.2 

 34.8 



755 



486 

 520 

 368 

 195 

 100 



27.5 



26.1 

 32.3 

 25.9 

 31.7 

 29.5 



2,749 

 1,863 

 1,611 

 1,423 

 612 

 339 



1,435 



1,362 



1,424 



726 



686 



562 



33.7 

 30.2 

 32.0 

 25.8 

 26.4 

 30.7 



2,740 

 3,073 

 2,969 

 2,027 

 1,813 

 1,240 



64.2 91 

 68. 82 

 66.61 64 

 72.0, 63 

 71.4 55 

 67 6! 32 



2.1 

 1.8 

 1.4 

 2.2 

 2.2 

 1 7 



4,266 

 4,517 

 4,457 

 2,816 

 2,554 

 1,834 



7 015 



2 



3 



800 

 610 

 633 

 171 

 121 



6,380 

 6,068 

 4,239 

 3 166 



4 



5 



6 



2 173 









Total... 



"Weighted 



average 



3,559 



41.4 



2,614 



30.4 



2,424 



28.2 



8,597 



6,195 



30.3 



13, 862 



387 



67.8 



1.9 



20,444 



29,041 















From Table 2 it is seen that the total forms collected ranged from 

 2,173 for plat 6 to 7,015 for plat 1. In other words, three times as 

 many forms were gathered in the bags in plat 1 as in plat 6. These 

 figures show the number of forms collected per plat to increase quite 

 rapidly with the increase in the number of pickings. In fact, the 

 average bolls per picking increased somewhat with the increase in 

 the number of pickings per plat. The figures on the percentage 

 infested and clean show this increase to be largely due to the fact 

 that more clean bolls were shaken off as the number of pickings per 

 week was increased. This was quite probably due to the weight of 

 the bolls breaking the stems during the frequently repeated shakings. 



The square collections show different results from the boll records 

 just noted. With the squares the increase per collection as the shak- 

 ings decreased in frequency is marked, ranging from 79 for plat 1 to 

 204 for plat 6. This difference in results between bolls and squares 

 is probably due to the fact that the clean squares are not broken off 

 in such large numbers by the excessive shakings as are the bolls. 

 In fact, the percentage of clean squares collected in the different plats 

 ranged only from 25.8 per cent to 33.7 per cent, while the clean bolls 

 ranged from 28.1 per cent to 44.5 per cent. Incidentally, these 

 results seem to indicate a rather undesirable amount of loss of clean 

 forms due to the shaking process. 



The high percentage of bolls recorded as " other injury" was due 

 to the fact that practically daily rains prevailed in the experimental 

 area during the month of July, and consequently there was a great 

 shedding of young, infertile or rotting bolls. This rain may have 

 increased the natural shedding of clean forms also, and thus raised 

 this percentage above normal. In the total of all the pickings in all 

 plats, one-third (weighted average 33.9 per cent) of the forms col- 



