BIOLOGY OF THE MEXICAN COTTON BOLL WEEVIL. — 13 
TABLE V.—Oviposttion period of the boll weevil on upland and sea-island cotton 
squares, insectary records, Madison, Fla., 1918. 
Upland cotton— A 
Nee period. Me Sea-island cotton. 
= ber ber 
Source of weevils. Season. XeOeall a LGA ee ES A SOS 
males. | Maxi- | Mini- | Aver- | males. | Maxi- | Mini- | Aver- 
mum.|mum.| age. mum.|mum.| age. 
Days. | Days. | Days. Days. | Days. | Days 
Hibernated............- May-July.-....-- 12 59 16 | 35.9 15 52 1 31 
Hibernated, fall fertili- |....- dons sees 10 53 5 | 21.7 10 44 16 Pea 
zation. 
First generation--.....- June-August. --- 8 55 31} 39.7 10 47 25 35. 4 
Second generation. --.-. July-September. 10 45 20) 35.2 10 46 19 33. 6 
NOY] LAS eee eee || Pe Re a ere sé AQ il pasty eas| Soh oes 33.1 Aya bea cna | aoe ee 31.6 
SUMMARY OF THE FECUNDITY OF THE BOLL WEEVIL ON SEA- 
ISLAND AND UPLAND COTTONS UNDER INSECTARY CONDI- 
TIONS. 
Table VI gives a summary of the fecundity records of the boll 
weevil on sea-island and upland cottons. Here it is shown that the 
average number of eggs per day was highest with hibernated weevils 
for both types of cotton.. The maximum number of eggs per day was 
made by a first-generation female on upland cotton and the maximum 
number per day on sea-island cotton was made by a hibernated 
weevil. The average number of eggs per female on upland cotton 
‘was 166.1 and the average number of eggs per day 4.92. On sea- 
island cotton the average number of eggs per female fell to 113.5 and 
the average per day to 3.8. These averages compare closely with 
those secured on upland cotton at Victoria, Tex., in 1913, where the 
females deposited an average of 212 eggs each and oviposition was 
at a rate of 5.9 eggs per day. 
TABLE VI.—Summary of the fecundity of boll weevils on sea-island and upland 
cottons under insectary conditions, 1918. 
Average! ,— Eggs per day. 
Number| number nctaee 
Source. offe- | ofeggs ent 
males per fe- eriod Aver- | Maxi- 
male Pp age mum. 
Upland cotton: Days. 
bern atedte sna. smeciee see ee ac acinar as aero 12 270. 3 35. 9 7.18 20 
Hibernated, fallfertilization. .-........ ssew EE cemented 10 117.7 21.7 5. 4 19 
WITSHSOMETAtLON Ss sees Sas ae ee ee Se a Seen 8 222. 8 39. 7 5. 6 25 
Secondigeneratvione cas. an see eee eee Pee ces 10 53. 9 3552 ILE i 
ANGE Le 2 SI SEE SR Se eee a Oe a a ees a ee PAC CVn ee A gh ta Bees) eae redoc 
IAC Es SS Bs SSE era RUA ae Ny TG DE 1 CR 0 Ol Wary Te 166. 1 33a ASOD hee ous 
Sea-island cotton: 
bern ated ae eee ie sulfa col aa ae eee 15 214.7 31 7. 38 19 
Hibernated, fall fertilization.........................-- 10 122 27.1 4.5 16 
HITS PCN ErallON eeeenr Meee ee ees eee eece erie ces 10 79.9 35. 4 222 11 
Secondigenerationecs ssss. Gece ees ae sans ee ee 10 37.5 33. 6 1.11 7 
