THE BOLLWORM OR CORN EARWORM. 



Wlien fully fed the larva3 leave the jDlant and burrow into the 

 ground, where they form a kind of cell in which they transform into 

 chrysalides or pupas of a mahogany brown color. (See fig. 6.) They 

 remain in this quiescent stage for about two we?ks except in the case 

 of the last brood in the fall, which stays in the ground until warm 

 weather the following spring. The depth at which these cells are 

 formed by the larva? in summer varies from 1 to 4 inches according 



Fig. (5. — Vertical section tlirougli soil sliowiiig pupa of l)()ll\voiiii in its burrow. About 

 natural size. (Kedrawu from Quaintancc and Brues.) 



to the hardness of th? soil. The overwintering i)upa> are formed at 

 somewhat greater dejiths, usually 4 to 6 inches. These chrysalides 

 or pupa3 produce moths which in turn lay eggs, thus completing the 

 entire life cycle in about 30 days during warm weather. 



That there is a definite connection between weather conditions and 

 injury to the cotton crop by this insect is generally recognized. 

 Cloudy and rainy weather during the latter part of July and through- 



