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-bug 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 
,370,000 
Number of 
bales of 
cotton rep- 
resented. 
a 16. 37 
4.13 
33.23 
6 9.13 
cl5.25 
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 &). 
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. 
