Boxelder Bugs
The boxelder bug occurs throughout the range of its
principle host in the U.S. The nymphs (immature) are
bright red in color; adults (12-14mm in length) are dark
brownish-black with three red stripes on the thorax and
red wing veins. The wings are thickened and leathery at
the base and membranous at the tip. The wings at rest are
held flat over the back with the membranous tips
overlapping.
Boxelder bugs feed on pistillate (female) flowers,
fruits, foliage and tender twigs of its preferred host,
boxelder, but also may feed on other maples, ash, and
even apple, grape and plum.
In the fall they will swarm towards houses looking
for suitable hibernation sites and will congregate in
large numbers on porches, exterior walls, foundations,
and walkways. They do not feed on foodstuffs, fabrics or
furnishings, but they may feed on some houseplants. They
can bite, and will do so if carelessly handled. They may
stain resting areas on walls and curtains with brown
fecal material, and they produce a disagreeable odor when
crushed.
If you choose to use an insecticide out of doors,
spray boxelder bugs on tree trunks, foliage (diazinon
25%EC carbaryl 50% WP and insecticidal soap). Do not use
carbaryl on house or other buildings. Indoors: vacuum
them up.
For a complete listing of suggested control options
for all home, yard and garden insect pests contact your
local Extension Service, found under local government in
the phone book.
Read and follow instructions on the pesticide label.
Heed all warnings. Check with your physician if you have
any concerns regarding your personal health risk.