———————————————————— a ae 
if 
feeding capacity of the adults, namely, that each adult weevil will 
attack at least one square each day and injure it sufficiently to cause 
it to fall. In the amount of injury is included that resulting from the 
feeding of the males for only one month, for the reason that they are 
short lived and doubtless die within that time. Account is taken of 
the feeding of the females for two months, since all evidence indicates 
that their egg laying is finished by that time and that they die soon 
after. 
The rate of increase is estimated upon an egg-laying capacity of 
fifty eggs per female, which is the minimum rate so far as yet ascer- 
tained. ; 
It should be stated by way of precaution that these tables are not 
to be taken as absolutely correct. They are only approximate and 
submitted to enforce the argument in favor of securing early fruitage 
in the cotton planted, and to show that this advice is based upon prin- 
ciple and not on opinions. 
Table 1 shows what numbers will be attained if a pair of weevils is 
left to breed unchecked by any methods of warfare. 
Tasie 1.—IJncrease of Mexican boll weevil if left to breed unchecked. 











Namiber Squares Squares |Uninjured| Squares 
Montl Reels eaten per | produced squares produced 
Se aise aves month per| per month| left per per plant 
Pp 3 | acre. per acre. month. |permonth. 
: ake. 2: See | 2 eee : w 
VEER ON Ls eee eet eee ns cece ta rerclal a cyeie rave! cin arse 2 60 8,300 8, 240 1 
1, 500 | 
JADE TT 5 OSEAN sero ee ee ee 50 a30 | 4,500 39, 970 5 
1,530 | | 
| 37, 500 | 
TSG eee ee 1,250 | a750 83, 000 44,750 10 
| | 
| 38, 250 | 
| 937, 500 | 
ESVESRURUE TES SEE ee ee | 31, 250 | a18, 750 DAGHOO)) Heese | 30 
| 956, 250 
CIS a ie eee Pes a ey ea eR |: season SOARS e ews ihe 92, 960 46 




a Number of squares injured during the month by females left over from previous months. This is 
half the entire number for that month feeding at the rate of one square per day. This note also 
applies to Table 2. 
b The total of uninjured squares is for July 1, while that of squares produced per plantis for August 1. 

Table 2 is the rate of increase based upon the supposition that one- 
half are destroyed by applying the methods recommended for protect- 
ing the crop. This is a minimum result which might be expected from 
any kind of successful warfare, and is submitted simply to further 
illustrate the advantage gained from determined effort, also the impor- 
tance of the use of early-maturing or early-fruiting varieties of cotton. 
19114—No. 1830—01——2 
