THE POTATO. 



205 



The Potato-stalk Weevil lives within the stalk in a 

 similar manner to the borer, but it undergoes its changes 



Fig. 50. THE POTATO-STALK BORER. 

 Moth. Larva. 



within the stem, and finally appears as a small beetle. 

 The different stages are shown in fig. 51. When a vine 



Fig. 51. THE POTATO STALK WEEVIL. 

 a, Larva ; b, Pupa ; c, Beetle. 



is seen to wilt, or to be dying, the stems should be ex- 

 amined for the larvae, and burnt to prevent an increase of 



the insect. The worms 

 of the potato and to- 

 mato-moth and the 

 other insects, exclu- 

 sive of the blister- 

 beetles, are not numer- 

 ous enough to inflict 

 much injury. The 

 Three-lined leaf-beetle 



Fig. 52. THREE-LINED LEAF BEETLE. feeds UpOU the plant 

 a, Larva; ft, End of Body; c, Pupa; d, Eggs. j n i{ . g ]aryal an( J per . 



feet state. The larvae can be distinguished from any 

 others, by being covered, like the larvae of the Tortoise- 



