You are here: PFRA Online > Shelterbelt Centre > Publications
Shelterbelt Centre Pest Leaflets
Boxelder Bug
Host: Maple
Appearance and Life History:
A boxelder bug overwinters as
an adult in dry, sheltered areas,
such as buildings and house
attics. In the spring, the bugs fly
to their hosts and deposit eggs
on developing leaves or in bark
crevices. Within the two weeks
the nymphs emerge and begin
feeding on the underside of the
leaves. The nymphs are black in
color, except for a bright red
abdomen which is eventually
covered by blackwing pads that
increase in size with
development. As the leaves
mature, the plant bugs prefer to
feed on the succulent,
developing seed pods. The
adult plant bug is brownish
black in color, with the wings
outlined in red and the thorax
marked with three red lines.
The adults measure
approximately 12 mm long and
may be present as early as
August. In the fall, the boxelder
bugs may be found congregated
in large masses on the sunny
sides of trees, buildings and
rocks. It is at this time the adults
begin seeking hibernation sites
and becoming an annoying
household pest.
Damage: Both the nymphs and
adults cause damage by sucking
the sap from maple leaves and
seed pods. The feeding action of the boxelder
bug on the leaves causes
speckling and distortion of leaf
growth. The damage is more
apparent on seed-bearing trees
where higher plant bug
populations are present.
Generally the damage to the host
is insignificant compared to the
nuisance created by the pest
congregating and searching for
hibernation sites around
dwellings in the fall.
Control: Control of the
boxelder bug is desired mainly
because the insect is a
household nuisance rather than a
pest of maple. The removal of
leaves, rocks and boards around
dwellings will discourage the
congregation of this insect.
Control of the boxelder bug may
be achieved by applying
insecticidal soap or by applying
a product containing carbaryl or
chlorpyrifos. These products
are most effective if applied
when the plant bugs are
clustered together. These
products are for outdoor use
only. To prevent plant bugs
from entering the household,
repair cracks in foundations,
windows and doors. The only
means of controlling plant bugs
within the dwelling is by
collecting and disposing or
vacuuming.
For more information contact:
PFRA Shelterbelt Centre
Indian Head, Sask. S0G 2K0
Phone: (306) 695-2284 or Fax: (306) 695-2568
E-mail: pfratree@agr.gc.ca
|