GRAIN-MOTHS 



359 



outward evidence of its work is seen in tiny, round holes through the 

 hard outer coating of the grain, showing where adults have emerged. 

 Frequently the adult moths, small, buff-colored " millers," are notice- 

 ably abundant, especially at threshing time. 



There are half a dozen or more generations in the course of the year. 

 The earliest moths in spring at once fly to the grain fields and two or 



three generations 



are reared in the 



growing kernels. 



The grubs of 



the last are har- 

 vested along with 



the grain, and 



the work goes on 



Fig. 565. — Larvae of 

 the Angoumois 



Grain-moth. En- as long as warm Fig. 566.— The Angoumois Grain- 



larged to twice nat- weather lasts. moth. Enlarged and natural size. 



ural size. Original. 



Original. 



Corn usually be- 

 comes infested only after being husked, the moths flying to it and 

 laying eggs on it. 



In control, grain should be threshed as soon as harvested. It should 

 be stored in tight bins, watched carefully, and if it heats, indicating 

 the presence of the pest, should be fumigated at once with carbon 



bisulphide. Corn husked late and 

 placed in open cribs out doors 

 seldom becomes infested. 



The European Grain-moth {Tinea 

 granella Linn.) 



A tiny moth, with brown and 

 white spotted wings, lays its eggs 

 on developing grains in the field, its 

 minute grubs feeding within the 

 kernels in similar fashion to the 

 It continues to breed in stored grains, 



Fig. 567. — The European Grain- 

 moth. Enlarged and natural size. 

 Original. 



Angoumois grain moth 



just as does the other insect named, but its work may readily be 



