﻿1:SE GEAISTAKY WEEVIL 



NATURE OF INJURY 



The granary weevil is destructive to grain (figs. 2 to 4) and grain 

 products (fig. 5) in both its adult and larval fornis. The adults feed 

 throughout their long lives and niay occasion as much injury as their 

 larvfe. The adults will feed upon many seeds and manufactured 

 cereal products and are found in flour. They do not oviposit in 

 any loose and finely divided grain particles too small to serve as food 

 for the development of a single larva. Thus flour and similar mate- 

 rials, like semolina used in the manufacture of macaroni, may be fed 

 upon by the adult weevil but not by the larvae unless the substances 

 become caked by long standing, in which case they are used by the 

 adult weevils as suitable materials for the rearing of their young. 



Fig. 2. 



-Injury to pearled barley rexultiriK from development of larvae and feeding of adult beetles 

 of the granary weevil in making exit from kernels 



Ordinarily when adult weevils are found crawling over sacks of flour 

 and similar finely divided grain products they are migrating from 

 near-by infested grain in the berry, and their presence will not cause 

 injury except that uninformed buyers, on noting the presence of 

 the weevils, may refuse to purchase or may insist on a lower 



Erice. The writers have; known of instances wn(u-(; dour-mill owners 

 ave incurred considerable expcns(i to band-pick granary weevils 

 from sacks of freshly manufactured flour standing overnight in the 

 mill. 



The adult weevil may become esl iiblishcul and cause loss in cartoned 

 gi-ains like pearled barley (fig. 2). In an instanc(^ rec(mtly called to 

 the attention of tbe writers a considcniblc shifHiicnt of p(^u^led barley 

 in small cardbourd cartons was foiiiul to he inf(^st<'(] with th(5 granary 



