Pest of the Month - Brown Marmorated Stink Bug

Pest of the Month - Brown Marmorated Stink Bug

Brown Marmorated Stink Bug, Nebraska Extension Acreage Insights May 2017. http://acreage.unl.edu/enews-may-2017
Figure 1: An adult brown marmorated stink bug. Overall they are a brown-bronze color, with lots of little brown and black dots that give them their marmorated moniker.

Four Things to Know about Brown Marmorated Stink Bugs

Nebraskans need to prepare for another invasive species in their lives. We already deal with Japanese beetles, multicolored Asian ladybeetles, and even emerald ash borer and the new bug on the block is the brown marmorated stink bug (or BMSB for short). While this pest was first detected in Nebraska back in 2010, there has been an increase in sightings in the last year.

1- How do you identify it? Brown marmorated stink bugs are part of an order of insects known as the true bugs. All true bugs have needle-like mouthparts on their head and they uses these to siphon out fluids for food. BMSB is also closely related to other, more common stink bugs and shares a similar shield-like shape with them. Overall BMSB is a little over ½ an inch in length and, as the name implies, they are brown in coloration. Marmorated means that are sort of marbled or spotted in appearance. We do have native brown stink bugs, but their underside is lime green which helps to differentiate between the two kinds.

2- Where is BMSB from? This stink bug is actually native to Asia, ranging between China, Japan, Korea and Taiwan. In these nations it is considered a pest but is of far less significance than it is here in the US. As with most invasive species, the brown marmorated stink bug has greatly benefited from a lack of diseases and predators to control it here in the US. The first find of BMSB in the US was in Pennsylvania in 1998. Since then, this insect has spread to 43 other states including Nebraska, Iowa, Kansas, and Colorado.

3- What are the issues with this pest? BMSB feeds on lots of different plants, including common garden crops such as tomatoes and peppers, tree fruits like apples and peaches, and small fruit crops like grapes and raspberries. BMSB can damage fruits and leaves on plants when it pokes its needle-like mouth into the plant’s surfaces. This injects saliva and also removes plant juices inducing stippling damage on leaves and necrotic spots on fruits. The chief issue most Nebraskans will deal with though is an annual fall invasion of their home by the stink bug. Stink bugs surviving for the winter are looking for spots to hide out and our homes offer a multitude of safe crevices to hide in. While they won’t breed in the home or damage the structure they are annoying and smelly.

4- How to prevent in the home? First and foremost you must seal up entry points into your home. If there are no easy routes inside, the insects can’t become a nuisance. Check for cracks around windows, doors, pipes, and chimneys and seal openings with silicone or silicone-latex caulk. It is also advisable to check screens on doors and windows for holes and to repair trouble spots or replace the entire screen. Insecticides can provide some protection if applied at the correct time of year, contact a pest control professional for help. If stink bugs are found inside, simply vacuum living specimens up and dispose of them outside. Do not use insecticide foggers as they provide little control over this pest.

If you grow any of the crops susceptible to this pest, you should consult the national BMSB website (http://www.stopbmsb.org/managing-bmsb/) for crop specific advice on managing this pest.

Image of Jonathan Larson
Jonathan Larson
Extension Educator - Entomology

Jonathan Larson is the Nebraska Extension entomologist for Douglas and Sarpy counties. His main focus is lawn and landscape pests but he also helps with bed bugs, roaches, and any other home invader that has six or more legs. Jonathan has his Bachelor of Science in Entomology from Purdue University, and his Ph.D. in Entomology from the University of Kentucky.

Contact Jonathan at:
Douglas/Sarpy County Extension
8015 W Center Rd.
Omaha, NE 68124-3175
(402) 444-7804