22 BULLETIN 926, U. S. DEPARTMENT OF AGRICULTURE. 
TaBLeE XI.—Fecundity record of individual hibernated females of the boll weevil 
fertilized in spring under field conditions on upland cotton. 
Progeny produced by individual females. | 
| Per- 
Num- . centage 
ber eggs Males. Females. Bothsexes. punc- 
Date oviposition de- tured 
began. posited [ ie | Geode Sauares: 
nor- LT od 
De- | Tota] produc- 
mally.) Wi Wee ‘i | Wee- cal Total | Period |~ in 
J lWeevil Pate vils /Weeyil velop-| wee es) TSE Re. e 
Ss | days. |mental erate days. oan bred. | days. _ sexes. 
period. 
Days. Days. | | Days 
Ma y20* 2822 SF 28 10} 188) 20.8 6| 124} 20.6 16 | *3I2)| 219-5 10" saat 
Dose eee 218 15 2001 1-2 Tie $48) OT 22. | 5| 20.2] 10.08 
Mayle oS 33 7| 137| 19.6 3 60 20 1@} 197] 19.7} 30.3 
Fel Coeret Was 80 4 93 | 23.2 7| 166| 23.3 11 | 259) 225) a5e7 
Dot sce aes 65 2 43 | 21.5 0 0}; oO 2 43]} 21.5} 13.07 
cpr iit eae 63 6| 132) 22 4} 92] 23 10| 224| 224] 158 
June @ te 22S ae: 1 49 1 22| 2 1 233 | 23 2 45| 22.5 4.08 
TunOS Ls eee ee 68 7 | -170)| 224-2 3 70| 23.3 10) 240,10 4 14.7 
Fah c Seed tae 70 6] 125| 20.8 Ti 52 207 13]. 277 |) 2es eis 
Tien 7 See 88 5| 120) 24 3 67 | 22.3 8 | AST Ves ee 
ae Cee ae 97 5| 104] 20.8 Z| 4352) 227 12} 256| 21.3} 13.6 
Juniors = La 54 5/-105| 21 4 91 | 22.7 9/ 196] 21.7 13.6 
Wi 21 eae eee 913 75 al ee aes 523 s0 145 eee 125; | 2681 ||. eae Se 
AVOTASC of. ieee 1G508) [22 eae FAY (2) mee ol ee 475,| RRCaSSe| oe See 21.7 17.99 
AXIMUM: 5-22 218 | ee 22 (4) eee 23.3 Tf es aes | 24 57.1 
Mimimnum.-_—_~ 2-2 28 ig see SSG Oe FAY es va |} 19.5 | 4.08 
SUMMARY OF THE DEVELOPMENTAL PERIOD OF THE FIRST- 
GENERATION BOLL WEEVILS IN UPLAND COTTON SQUARES 
UNDER FIELD CONDITIONS. 
Table XII gives a summary of the period of development in up- 
land cotton squares of first-generation weevils under field condi- 
tions, together with the temperature and humidity records. The 
average period of development in the infested squares while the 
squares remained on the growing cotton plants is shown to be 10.9 
days. During the time the infested squares were on the ground or 
after they had dropped off the plant the average period of develop- 
ment is shown to be 11.4 days. The average maximum soil tem- 
perature was 103.7° F. Since it has been demonstrated that the 
boll weevil develops most rapidly under a mean temperature of 84° 
F., the higher temperatures experienced while the square is on the 
soil retard the developing process and prolong the developmental 
period of the weevil. Also high soil temperatures are directly re- 
sponsible for the death of large numbers of immature weevils. At 
Madison it was observed that a very high percentage of teneral 
weevils was killed by the heat before the weevils.could make an 
emergence hole in the square. 
1) 
