Angoumois Grain Moth. 5 
inch long and are too small to be seen without the aid of a magnifying 
glass. They are laid on or near the grain. They are white when 
first deposited, but later turn a reddish color before the larva or 
grub hatches. A moth may lay as many as 150 eggs. 
An egg is 
shown in figure 8, b. The larva is shown in figures 1, 8, and on title 
page. 
When just hatched the larva is tiny, being no thicker than a 
hair. After feeding in the grain it becomes full grown and is then 
about one-fifth of an inch long, white in 
color, with a yellowish-brown head. The 
pupa or chrysalis is reddish brown and is 
shown in figures 1, 5, and 8. 
INJURY. 
Injury to grains by the Angoumois 
grain moth always takes place in the 
larval stage. Injury is more difficult to 
detect in the early stages of infestation 
because the grub or larva bores its way 
into the seeds when it is so small that the 
hole by which it enters can not be found 
without a close search with a magnifying 
glass. Usually after it has eaten its way 
into the seed, the larva turns about and 
spins a silken web over the opening by 
which it has entered, thus making it even 
more difficult to locate the entrance hole. 
Once within the seed, the grub eats out 
the interior where it feeds unseen and 
often unsuspected by the owner of the 
grain. Usually the first indication the 
average grower has that his grain is in- 
fested is the simultaneous appearance of 
moths and the round holes (figs. 2, 5, 7, 8, 
and 9) that appear in the individual ker- 
nels, or sometimes by the heating of the 
grain in the bin. Then he finds upon 
cutting open the seeds in which the holes 
have appeared that they have been hol- 
lowed out by the larva (figs. 1, 4, 5, and 
8) and that his grain has not only lost 
heavily in weight but that it contains 
much excrement and webbing left be- 
hind by the insect. The larva has jaws 
called mandibles, and it uses them almost 
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Fig. 2.—An ear of corn showing 
the emergence holes of the 
Angoumois grain moth. When 
these holes begin to appear 
in your corn and_e small 
clothes-moth-like millers are 
found flying when the corn is 
disturbed, you may be certain 
that the Angoumois grain 
moth is already damaging 
your corn. 
