20 
BULLETIN 926, U. S. DEPARTMENT OF AGRICULTURE. 
under field conditions. Female weevils liberated in large cages over 
growing cotton plants frequently get killed accidentally, spiders 
sometimes catch them, and they escape very readily from the cages. 
The records presented in Table XI really indicate the rate of oviposi- 
tion per day instead of the average number of eggs deposited per 
female. 
TABLE IX.—E£gg-laying activity of individual hibernated female boll weevils 
kept with males under field conditions on upland cotton. 
Parent weevil. Beaten 
Date of | Date of 
of eggs 
| first egg. | last egg. depos- 
Generation. Nas sd 
| 
Hiibernaved 2-25 -e eee AX A | May 29] June 1 | 28 
ID Oss so 65 ose A 2 =-d0!s2>4|) dune) 213) 218 
ID eee Ree A 3 |-May 31 | June 5 | 33 
ID ORNs ae ee A 4 | June June 14 80 
DOSS eat aa RO eS COs June 8 | 65 
DY Ose tee eee A 7 | June 8} June 15 | 63 
1D eos Sat ge A ®& | June 9 | June 13 | 49 
Dos eeseee sees AQ | June 8} June 14 68 | 
| Do eas eee ate NSP LU) ERG ae oe June 19 70 | 
IDG ea ae ee eae A 13 | June 12 | June 21 88 
DOE ete eee IAC BAS Ee Osea June 23 97 
DOME eaten eee A 16} June 18 | June 22 54 | 
Bo) 2) [eee SB area 4 Ue ane oe 913 
ASV CTO rot ce ete | ede, | Eee [See e 76 
Bex TED TN es Se ee eee re eee eee | ge ete 218 | 
gM TaN 6 Uy a eWay Pes | BA ee ae) Sear a Se ee ee | 33 
LENGTH OF TIME UPLAND COTTON SQUARES HANG ON THE 
PLANTS AFTER EGG PUNCTURE. 
In Table X are found the data on the length of time squares hang 
on the plants after egg puncture by the weevil. 
ber of days from the time the egg is deposited until it drops off the 
plant is shown to be 11.5 days. 
square hung on the plant after egg puncture was 19 days and the 
minimum period 6 days. 
The length of time elapsing from the date of falling of the infested 
square from the cotton plant to the emergence of the adult weevil is 
shown to be 10.8 days. Practically one-half of the weevil’s immature 
stage is developed while the square is on the plant. 
number of days from falling of the infested square to the emergence 
#2) 
Aver- | Maxi- 
age mum 
number|num ber = 2 
of eggs | of eggs Source of weevils. 
per per 
| day. day. 
7 8 | Hibernated field collected. 
9.9 19 Do. 
5.5 7 Do. 
6.1 9 Do. 
9.3 18 Do. 
7.9 13 Do. 
9.8 13 Do. 
9.7 14 Do. 
58 11 Do. 
11 19 Do. 
= fee al 19 Do. 
10.8 18 Do. 
ee ASE 168 
aoe eae 
1 19 
ye | Bre es 
The average num- 
The maximum length of time any 
The minimum 
¢ 
of the adult weevil was 3 days and the maximum number 19 days. 
