INJURIOUS AND BENEFICIAL INSECTS 



39 



INSECTS AFFECTING STORED FOOD PRODUCTS 



78 Grain moth (Sitotroga cerealella). A small cater- 

 pillar about ^^ inch long working in various grains and producing 

 a whitish moth with a wing spread of a little over J inch. 



Treatment : fumi- 

 gate infested grain 

 with carbon bisul- 

 fid, and treat sus- 

 pected granaries in 

 the same manner. 



79 Saw-toothed 

 grain beetle ( S i 1 - 

 vanus surina- 

 m en s i s). A small, 

 brown/slender beetle 

 about -J inch long found infesting cereals and dried food prodncts. 

 A common and prolific species which may complete its life cycle 

 in 24 days, and may produce seven generations within a year. 



Fig. 70 Grain moth: a larva; b pupa; c moth; d wings of a 

 paler variety; e egg; /kernel of corn showing work of larva; 

 g, h other structural details— all enlarged except/ (after Riley) 



Fig. 71 Saw-toothed grain beetle : a adult ; b pupa ; c larva —all enlarged (after Chittenden, 

 U. S. dep't agr., div. ent., bull. 4, n. s.) 



Treatment : fumigate infested cereals with carbon bisulfid, and 

 allow none of its food to lie long undisturbed. 



