60 



PLANT-BUGS INJURIOUS TO COTTON BOLLS. 



parts. The results of these 5 examinations of 25 plants each are 

 summarized as follows: 



Table XXVII. — Classification of bolls on average plant, Ceceda A 14, with reference 



to plant-hug damage. 



Examina- 

 tion No. 



Unopen. 



Empty 

 burrs. 



Perfect, 

 open. 



Slightly 



stained, 



open. 



Badly 



stained, 



open. 



Destroyed. 



1 

 2 

 3 

 4 

 5 



Average 



Per cent. . . . 



9.6 

 13.7 

 10.6 

 11.3 



7.6 



1 



4.4 



3.8 



1.68 



1.92 



9.56 

 22.3 

 16 



13.2 

 10.6 



3.48 



5.72 



6.2 



5.4 



9.4 



5.2 



7 



6.5 



5.4 



7.1 



8.12 

 7.52 

 10 

 7.5 

 7.2 



10.56 

 22.1 



2.56 

 5.3 



14.33 

 30 



6.04 

 12.6 



6.24 

 13 



' 8.07 

 17 



The average number of bolls per plant throughout the block accord- 

 ing to the above data is 47.8. Data previously collected showed an 

 average of 93 plants per row in this block which consisted of about 

 1,660 rows. There were accordingly in round numbers 154,000 

 plants in the block and about 7,370,000 bolls. 



Tests by officers of the Tlahualilo plantation showed that the 

 cotton grown at that place averaged about 63 bolls of seed cotton per 

 pound. It can be readily calculated from this data that if all the 

 bolls in the block produced good lint there would be a yield of 

 approximately 78 bales for the 120 acres in the block. These bolls 

 and their equivalents in bales of cotton are here given in tabular 

 form. 



Table XXVIII. — Classification of bolls in entire block, Ceceda A 14, with reference to 



plant-bug damage. 



Classification. 



Unopen 



Empty burrs 



Perfect and slightly stained, open 



Badly stained, open 



Destroyed 



Total ! 



Estimated 



number of 



bolls. 



1,629,000 

 391,000 



3, 139, 000 

 958, 000 



1,253,000 



7,370,000 



Number of 



bales of 

 cotton rep- 

 resented. 



a 16. 37 



4.13 



33.23 



^9.13 



C15.25 



78 



a An examination showed that about 5 per cent of unopened bolls were ruined by plant-bugs; conse- 

 quently 0.86 bale has been deducted from the number of bales represented. 



b About 10 per cent of the total number of locks in badly-stained bolls were destroyed; consequently 

 1.01 bales were deducted. 



c Including 0.86 bale, or 5 per cent, of unopen bolls (see note a) and 1.01 bales, or 10 per cent, of badly- 

 stained bolls (see note b). 



According to the writer's estimate, the maximum possible yield 

 in this block would be 78 bales, less the number of bales represented 

 in the above table by the empty burrs and the destroyed bolls. This 

 gives 58.73 bales or 0.49 bale per acre. The actual yield as finally 

 recorded at the office of the Tlahualilo Company was 55 bales for the 

 block or 0.46 bale per acre. 



