ae ee ee 
Stored-Grain Pests. 15 
Each female moth may lay as many as 150 eggs, which are white 
when first laid but soon change to a reddish color. The eggs are laid 
on or near the grain. Upon hatching, the minute white larva or cater- 
pillar bores into a kernel of grain and begins feeding on the contents. 
When full grown it eats out a channel to the outside of the seed but 
leaves a thin layer of the seed coat intact. It then changes to a red- 
dish brown pupa, and later the adult or moth emerges, pushing aside 
the thin section of seed coat that covers the exit from the channel. 
The development from egg to adult may be completed in five weeks. 
Figures 15 and 16 show the successive stages in the development of 
ic. 16.—Cross section of ear of corn showing development of Angoumois grain moth in 
corn. The newly hatched larva crawls down to the germ end of the corn and begins 
feeding upon the soft germ. As it grows older and stronger it eats out into the firmer 
pertion of the kernel and finally, in most instances, eats to the outer end. (Back.) 
this insect in a kernel of wheat and of corn from the time the egg is 
laid until the adult appears. In figure 17 is shown an ear of corn 
with the external evidence of heavy attack, and in figure 18 are shown 
wheat kernels with the emergence holes of the moth. For a further 
discussion of this pest see Farmers’ Bulletin 1156, “ The Angoumois 
Grain Moth.” 
WOLF MOTH.’ 
‘The wolf moth is a small moth about the size of the Angoumois 
grain moth, creamy white and thickly mottled with brown. The 
mottled appearance distinguishes it from the Angoumois grain moth. 
Tt infests all kinds of grain, both in the field and in storage. The 
larva feeds on the grain and webs the kernels together. 
® Tinea yranella qu. 
