Identifying the Brown Marmorated Stink Bug (BMSB) | Le distinguer des autres espèces

Hi, I’m Hannah Fraser, Entomology
Program Lead for Horticultural Crops, with the Ontario Ministry of
Agriculture, Food and Rural Affairs. In this segment on the brown marmorated stink
bug, I’ll show you how to identify this new invasive pest and how to distinguish it
from other similar looking species. The brown marmorated stink bug, or BMSB for short,
is an invasive pest from east Asia that has made its way to Ontario. This insect has a broad
host range including tree fruit, berries, grapes, vegetables, soybeans, as well as many
landscape trees and ornamentals. BMSB causes direct damage
to fruit, vegetable and agronomic crops as a result
of feeding injury. In the mid-Atlantic US,
where BMSB has been present since the mid-1990s,
growers have experienced significant crop loss. Early detection is
important in mitigating against crop loss. Stinkbugs are shield-shaped insects, broad
close to the head, and tapering towards the tip of the abdomen. Some common stink bugs
you are likely to see in crops include various species of brown stink bugs, the rough stink
bug, the green stink bug, and Podisus, the predatory stink bug. Other insects often confused
with the BMSB are the western conifer seed bug and the squash bug. The BMSB adult is
a relatively large stink bug, about 12-17 mm in length, not including the antennae,
with a mottled brown appearance after which BMSB gets its name. The most
important distinguishing feature is the presence
of two white bands on each antenna, visible on the adults and
on late instar nymphs. Though not unique to BMSB, the adults have a single faint light
band on their legs, while the legs of nymphs have an obvious white
band on each leg. Other features include an
alternating pattern of light and dark markings,
with light inward-pointing triangles, along the
edge of the abdomen. The edge of the pronotum, the plate behind
the bug’s head, is smooth and the humerus, or shoulders of the bug, are rounded. And
the front part of the head, or “face” is blunt rather than pointed, as observed
in some other similar looking species. These features can help
you identify BMSB, but remember, the most important
feature is the presence of two white bands on each antenna. The BMSB
are significant agricultural and landscape pests, but they can also become nuisance pests
for homeowners in areas where they are abundant. That is because they overwinter in homes and
other structures, sometimes in large numbers. Homeowner reports are often the first sign
that BMSB are established in an area. Early detection of BMSB is critical in mitigating
against crop injury. We are still learning
about BMSB, in terms of both its distribution and
its biology in Ontario. For more information, visit our website,
or give us a call.

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