Bagworm
Host
In Oklahoma the most common hosts are eastern red cedar, other junipers, and arborvitae. Other hosts sometimes damaged include pines, spruce, bald cypress, maple, boxelder, sycamore, willow, black locust, oaks, and roses. The bagworm has been recorded on 128 different plant species in various parts of the United States.
Symptoms
Bagworm larvae damage their hosts by feeding on the foliage. Heavy infestations can completely defoliate small plants. Defoliation usually kills hosts such as red cedar and other junipers. Broadleaf hosts are not killed but are weakened and become more susceptible to borers and diseases.
Life Cycle
The overwintered eggs (in the year old female bags) begin to hatch in late April or
early May and the young larvae begin to feed and construct bags immediately. The first
evidence of an infestation is normally a small bag, about 1 /4 inch long, standing
almost on end. As larvae grow, silk and fragments of the host plant foliage are added
to the bag until it reaches 1 1/2 or 2 inches long. When larvae are mature they fasten
the bag to a plant stem with silk. Pupation occurs in the bag in August and males
emerge in late August and September. They engage in a mating flight in search of the
wingless females still inside their bags. After mating the female lays several hundred
white eggs inside her old pupal case, drops from the bag, and dies. There is one generation
per year.
Description
Adult males are small, clear winged moths with a black, hairy body and a wingspread
of about 1 inch. Adult females are wingless, have no functional legs, eyes, or antennae,
and are almost maggotlike in appearance. The females body is soft, yellowish white,
and practically naked except for a circle of woolly hairs at the posterior end of
the abdomen. Mature larvae have a dark brown abdomen and the head and thorax are white,
spotted with black. They are about 1 inch long. Both larvae and adult females are
found in silken bags on the host plants.
Control
Please contact your local county extension office for current information.