﻿10 BULLETIN 1397, U, S. DEPARTMENT OF AGEICULTUEE 



Table 1. — Longevity of resting larvm of the pink, 'bollworm 



Country 



Authority 



Conditions under which Isept 



Longevity 



Egypt 



Gough* 



Stored seed 



Months 

 27 



Do- 



do.i--- 



do 



16 



Do--- .. 



BaJlou 2 - 



do - 



24 



Do 



do.3 



-— do 



30 



Do--. 



do.« 



do 



31 



Do 



Willcocks ' -. 



Natural conditions 



22 



Hawaii 



Busck 8--- --. . - 



Stored seed 



18 





T.nftin, MnKinnAy, anrl TTansnn ' 



do - 



12 



Do 



Ohlendorfs 



Stored bolls i" 



Over 16 



Do 



Unpublished '— 



Stored bolls- 



16M 











» {9, p. 9.) 



' a, p. 16.) 



< (2, p. 26^.) 

 « {Zl, p. 154.) 



« (S, p. 356.) 



' m, p. 16.) 



8 {17, p. 10.) 



s Unpublished manuscripts, U. S. Department of Agriculture. 



"Resting larvae in stored seed lived 15 months. 



After a variable time, as has been indicated, the larA^a transforms 

 into a pupa or chrysalis. The pupal stage lasts from 6 to 20 days, at 

 the end of which the moth emerges. The life of the moth is rather 



Fig. 9. — Typical holes made by pink bollworms through cotton-boU carpels 



short. Under favorable conditions Busck succeeded in keeping 

 some specimens alive for 32 days, but under the same conditions the 

 great majority of the insects died in from 14 to 20 days. 



The moth is seldom seen in nature. It habitually hides during the 

 day under stones or brush. The normal time of flight is from 

 6.30 to 8 p. m. Although apparently capable of prolonged flight, 

 the moths prefer to go no farther than the first cotton field. They 

 are so quiet in their habits and so easily overlooked that many may 

 occur unnoticed in the field. 



