INSECTS INFESTING THE POTATO. 



307 



row even into the roots. It assumes the pupa form (Fig. 

 302/j) in its burrow, and the perfect beetle issues in the latter 

 part of tlie Summer or late in the Fall, and passes the Winter 

 in some sheltered situation. 



Fig. 803. — Potato-stalk Weevil — color, bluish- 

 black. 



This weevil (Fig. 803) is about two lines long, of 

 an elongate-oval form, and is of a bluish-l)lack 

 color, with three black dots at the base of the tho- 

 rax, the middle dot being situated upon the small 

 wedge-shaped piece technically called the scutel. 



In the southern part of this State these insects are quite 

 frequently met with upon the Jamestown weed {Datura stra- 

 moiiiiim'), in the stems of- which they breed. 



Remedy. — Use No. 25. 



CHAPTER CCVII. 



The Stalk Borer. (Cal.) 



(Gortyna nitela. — Guenee.) 



Order, Lepidoptera ; Family, Noctuid.e. 



[Burrowing into the stalks of corn, potatoes, tomatoes, cur- 

 rant-l)uslies, etc. ; a l)rownish sixteen-legged worm marked 

 with white strii)es.] 



Fig. 804.— Stalk 

 Borer ; i, the moth — 

 color, gray ; -'', the 

 c a t e rp i 1 lar — colors, 

 white and brown. 



This borer (Fig. 

 804, ~^) when fully 

 grown measures about 



one inch and three lines in length, is of a reddish-brown color, 

 marked on the back with three white lines, the two lowest ones 

 interrupted on the segments from the fourth to the seventh, 

 inclusive ; the underpart of these segments is reddish-brown, 



