Webworms Injurious to Cereal and Forage Crops and Their Control. Page: 13
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Webworms Injurious to Cereal and Forage Crops. 13
instance practically all the pastures in several counties were completely
stripped of every green blade of grass, appearing in late May
as bare and brown as is usually the case in December. Most of such
fields produced very little growth during the rest of the season and
in many of them much of the grass died outright. While no such
severe devastation has been observed since that time, it illustrates
the severe injury of which any of these common grass-feeding webworms
are capable of when all the conditions favor them.
The black-headed sod webworm has only one generation each year.
The eggs are laid in August and September and soon hatch. The
tiny worms feed for a few days until cold weather overtakes them
and then remain quietly within their little silken galleries throughout
the winter. With the opening of spring they become active and
feed vigorously until they are fully grown, which usually is about
the first of June. They then construct
cocoons in the earth just be-, '
neath the surface and lie in them r
quietly until August, when they
change to pupe and emerge a t
week or ten days later as moths. ;
The moth (fig. 8) is rather
large, clay-yellow, flecked with
numerous chocolate-brown scales
and with gold fringes on the FIG. 11-Adult of blue-grass webworm.
wings. It is cos wn About three times natural size.
wings. It is conspicuous when
flying and often very abundant. This is probably the most widely
distributed of all the sod webworms, as it occurs from Texas to and
throughout southern Canada and from Maine to California.
LEATHER-COLORED SOD WEBWORM.6
The leather-colored sod webworm is one of the largest of the sod
webworms, the mature worm reaching a length of about an inch and
the moth spreading about an inch and a quarter. The moth is yellowish
gray and the larva or worm dark leather-brown or dingy yellow
clouded with brown. This species occurs entirely across the continent
in southern Canada, south to Tennessee east of the Mississippi,
and almost to the Mexican border in New Mexico. It is abundant
and destructive over an area extending from Ohio to Iowa.
There are two or three generations each year. Only small larvae
live throughout the winter. In the fall, usually in October, each
tiny larva spins a thin but tough, white, silken case closely about
itself and remains tightly coiled in this case until April, when it
again begins to feed. These overwintering larvae complete their
e Crambus trisectus Walk.
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Ainslie, George G. Webworms Injurious to Cereal and Forage Crops and Their Control., book, May 1922; Washington D.C.. (https://digital.library.unt.edu/ark:/67531/metadc3480/m1/13/: accessed April 24, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.