The Bollworm or Corn Earworm Page: 6
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FARMERS' BULLETIN 872.
bore into the growing tips of the plants and occasionally destroy
the flowers as well.
In tobacco the injury consists of the penetration of the small leaves
in the growing tip, hence the common name of budworm. A related
caterpillar,' however, attacks tobacco in a very similar manner. A
single caterpillar may render several leaves unfit for wrapper by
penetrating the bud.
HABITS OF THE INSECT AND HOW IT DEVELOPS.
A general knowledge of the life history and habits of an insect is
needed in order intelligently to combat it. The bollworm or corn ear-
worm when mature (fig. 4) is a moth or miller about 1J inches across
the spread wings. It varies in color
from a light brown or olive green to
pale yellow and it is commonly seen
flying about in the evening. These
moths feed upon nectar of various
flowers and when mature they de-
Sposit from nearly 500 to almost 3,000
eggs. The eggs (fig. 5) are laid on
various parts of the plant and to
some extent upon weeds and upon
the ground. They are white or yel-
lowish in color, oval, and covered
with minute ridges running from
FIG. 4.-Bollworm moth with wings top to bottom and still smaller
folded in natural position. About ridges across these. They are large
twice natural size. (Quaintance.)
enough to be seen readily with the
naked eye. The eggs hatch in from 2. to 8 days or even longer, de-
pending upon the temperature.
When first hatched the larvae or caterpillars are extremely small.
They feed here and there on the surface of the plant near where the
eggs were laid, but gradually work to-
ward some tender portion within which
they can bore. Growth is rather rapid,
being completed in about 20 days. The
larvae shed their skins four or five times
FIa. 5.--Fgg of bollworm moth.
during this period. When full grown side and top views. Highly
they are about 11 inches in length. The magnified. (Quaintance and
color varies from pale green to almost 3ruee.
black. During the last few days of the life of the caterpillar it is
capable of consuming large quantities of food, an;l it is during
this period that it is most destructive.
1 Known scientifically as Chlorldea virescens Fab.
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Bishopp, F. C. (Fred Corry), 1884-1970. The Bollworm or Corn Earworm, pamphlet, 1917; Washington D.C.. (https://digital.library.unt.edu/ark:/67531/metadc96511/m1/6/: accessed September 26, 2023), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.