BIOLOGY OF THE MEXICAN COTTON BOLL WEEVIL. eh 
TABLE X.—Showing development of weevil as related to the length of time 
squares hung on plants after egg puncture, eggs deposited by hibernated females 
on upland cotton. 
Aver- A ‘i Aver- 
Mini- | Maxi- age fini- | Maxi- age 
Total Ecole. mum | mum |number| Total pro mum } Mum |number 
number aes = number|jnumber| days |jnumber dans number|number| days 
Date oviposition | squares) inca dayson|dayson| from | squares pele days days from 
began. under Pt er | Plant | plant | punc- | under | -j);n¢ | from | from | falling 
obser- | Dunc. | after | after |tureto| obser-| “}, 8 | falling | falling) of 
vation. ee pune- | punc- | falling | vation. Gait (0 to square 
ture. | ture. of u™- | adult. | adult. | to 
square. adult. 
| } | | 
IVER YSZ OE Se ae re Se 29 315 7 TGS |b eS 12 | 122 7 12 10.1 
May 27). 5. eee 100 | 1,125 6 1ST ei) 2 NZ 185 7 15 10.8 
Maysoli anes: ese 3 24 269 8 16 11.2 9 | 82 d 11 9.1 
ADS 0(e) [eB eme  oeee e 33 400 6 17 12.1 141 | 108 3 13 9.8 
Done eras 24 307 10 | 1 PAZ 2 21 10 11 10.5 
JUNCSa sa See ees 23 265 7 17 | 10.6 Os 79 U 16 11.2 
PUIG Oe Se eee 12 148 6 | 1 |) IP4e: 2 22 10 12 11 
Dtme Sas eee en 42 482 7 | 19| 11:4 9 105 9 16 11.6 
IDO 51 514 7 He} |, OS 7/ 8 107 10 16 13.3 
SUTIC Qi Mee ke 28 289 6 UG ake 14 156 9 19 peel 
OEE See 36 410 6 UGse welled 7 83 10 | 15 11.8 
SUNG 18-2265 -2. 2 ae! 19 240 9) 19) esis: 6 4 39 9 | 1l 9.7 
| | 
Totaleres see 421 | 4,764 85 QOOM Seas et 102 | 1,109 98 GY | eS oe 
AW Crap Ona soma ate le keene 0 7.08 aCe ee Sia awe Set 13.9 10.8 
Maximum.........- Het ell et ede 10 19 13.6 17/5 Seen 10 19 13.3 
MuEnimum 2 esos 2 se | SS aboce kaeeeeee 6 13 10.3 | ZN eet Sepa 3 | 11 9.1 
FECUNDITY RECORDS OF HIBERNATED FEMALE BOLL WEEVILS 
ON UPLAND COTTON UNDER FIELD CONDITIONS. 
The data on the fecundity of hibernated female weevils under 
field conditions are presented in Table XI. Of the progeny produced 
by the individual female weevils 73 males required 1,536 weevil days, 
or an average period of 21.7 days, for development from egg to adult. 
A total of 52 female weevils required 1,145 weevil days, or an average 
period of 20.2 days, for development of the immature stage. The aver- 
age period of development for both sexes under actual field conditions 
was 21.7 days, with a maximum of 24 and a minimum of 19.5 days for 
the first-generation weevils. <A total of 17.99 per cent of the infested 
squares produced adult weevils. This percentage is remarkably low 
compared with the generally accepted behef that approximately 
35 per cent of the infested squares produced adults. At Madison 
the Norfolk sandy soil is so well drained that the developing weevils 
are exposed to terrific heat during the time the square is on the soil 
before the adult weevils emerge. Consequently a very large mor- 
tality occurs among the immature stages of the weevil. 
