Brown Marmorated Stink Bug
Halyomorpha halys (Stål, 1855)
Brown Marmorated Stink Bug in all of Ohio
- Kingdom
- Animalia
- Phylum
- Arthropoda
- Class
- Insecta
- Order
- Hemiptera
- Family
- Pentatomidae
- Genus
- Halyomorpha
Introduced and invasive status
Introduced in Ohio: iNaturalist (opens in a new tab)
Also listed
- Introduced and assessed as invasive in the lower 48 states
iNaturalist's volunteer curators list it as introduced in their Ohio checklist.
US-RIIS assesses a species as invasive when it causes, or is likely to cause, harm there, or is at least locally abundant and harmful ecologically, economically, or to health.
Status: Simpson A, Sellers E, Pagad S (2023). United States Register of Introduced and Invasive Species (US-RIIS), ver. 2.0. U.S. Geological Survey, https://doi.org/10.5066/P9KFFTOD (opens in a new tab)
Range
Where it is recorded
Season shown in 1 of Ohio's 88 counties. Explore Ohio
- No result yet (9)
- Recorded, too few records for a result (58)
- Recorded, season not shown (20)
- Season shown (1)
Counties as a table
| County | Records |
|---|---|
| Adams County | Recorded, too few records for a result |
| Allen County | Recorded, too few records for a result |
| Ashland County | Recorded, too few records for a result |
| Ashtabula County | Recorded, too few records for a result |
| Athens County | 70 · Recorded, season not shown |
| Auglaize County | Recorded, too few records for a result |
| Belmont County | Recorded, too few records for a result |
| Brown County | Recorded, too few records for a result |
| Butler County | 177 · Season shown |
| Carroll County | Recorded, too few records for a result |
| Champaign County | Recorded, too few records for a result |
| Clark County | Recorded, too few records for a result |
| Clermont County | 25 · Recorded, season not shown |
| Clinton County | Recorded, too few records for a result |
| Columbiana County | Recorded, too few records for a result |
| Coshocton County | Recorded, too few records for a result |
| Crawford County | Recorded, too few records for a result |
| Cuyahoga County | 113 · Recorded, season not shown |
| Darke County | Recorded, too few records for a result |
| Defiance County | Recorded, too few records for a result |
| Delaware County | 45 · Recorded, season not shown |
| Erie County | Recorded, too few records for a result |
| Fairfield County | 27 · Recorded, season not shown |
| Fayette County | Recorded, too few records for a result |
| Franklin County | 220 · Recorded, season not shown |
| Fulton County | No qualifying records yet |
| Gallia County | Recorded, too few records for a result |
| Geauga County | 31 · Recorded, season not shown |
| Greene County | 42 · Recorded, season not shown |
| Guernsey County | Recorded, too few records for a result |
| Hamilton County | 143 · Recorded, season not shown |
| Hancock County | Recorded, too few records for a result |
| Hardin County | No qualifying records yet |
| Harrison County | Recorded, too few records for a result |
| Henry County | No qualifying records yet |
| Highland County | Recorded, too few records for a result |
| Hocking County | Recorded, too few records for a result |
| Holmes County | Recorded, too few records for a result |
| Huron County | Recorded, too few records for a result |
| Jackson County | Recorded, too few records for a result |
| Jefferson County | Recorded, too few records for a result |
| Knox County | Recorded, too few records for a result |
| Lake County | 45 · Recorded, season not shown |
| Lawrence County | Recorded, too few records for a result |
| Licking County | 35 · Recorded, season not shown |
| Logan County | Recorded, too few records for a result |
| Lorain County | 23 · Recorded, season not shown |
| Lucas County | 36 · Recorded, season not shown |
| Madison County | Recorded, too few records for a result |
| Mahoning County | 23 · Recorded, season not shown |
| Marion County | Recorded, too few records for a result |
| Medina County | 23 · Recorded, season not shown |
| Meigs County | Recorded, too few records for a result |
| Mercer County | No qualifying records yet |
| Miami County | Recorded, too few records for a result |
| Monroe County | Recorded, too few records for a result |
| Montgomery County | 90 · Recorded, season not shown |
| Morgan County | Recorded, too few records for a result |
| Morrow County | Recorded, too few records for a result |
| Muskingum County | Recorded, too few records for a result |
| Noble County | No qualifying records yet |
| Ottawa County | Recorded, too few records for a result |
| Paulding County | No qualifying records yet |
| Perry County | Recorded, too few records for a result |
| Pickaway County | Recorded, too few records for a result |
| Pike County | Recorded, too few records for a result |
| Portage County | 39 · Recorded, season not shown |
| Preble County | Recorded, too few records for a result |
| Putnam County | No qualifying records yet |
| Richland County | Recorded, too few records for a result |
| Ross County | Recorded, too few records for a result |
| Sandusky County | Recorded, too few records for a result |
| Scioto County | Recorded, too few records for a result |
| Seneca County | Recorded, too few records for a result |
| Shelby County | Recorded, too few records for a result |
| Stark County | 46 · Recorded, season not shown |
| Summit County | 96 · Recorded, season not shown |
| Trumbull County | Recorded, too few records for a result |
| Tuscarawas County | Recorded, too few records for a result |
| Union County | Recorded, too few records for a result |
| Van Wert County | No qualifying records yet |
| Vinton County | No qualifying records yet |
| Warren County | 31 · Recorded, season not shown |
| Washington County | Recorded, too few records for a result |
| Wayne County | Recorded, too few records for a result |
| Williams County | Recorded, too few records for a result |
| Wood County | Recorded, too few records for a result |
| Wyandot County | Recorded, too few records for a result |
No mapped range from the range source used, the USGS Gap Analysis Project, which maps land vertebrates only.
Season
When it is recorded
In Fairfield County
Not enough evidence
Records per week from 27 records in 7 of the 10 years from 2016 to 2025. Shows when people recorded it, not a season or how common it is.
Show as a table
| Week | Records of Brown Marmorated Stink Bug | Years recorded | Records of all species |
|---|---|---|---|
| Jan 4–10 | 0 | 0 | 30 |
| Jan 11–17 | 0 | 0 | 23 |
| Jan 18–24 | 0 | 0 | 19 |
| Jan 25–31 | 0 | 0 | 30 |
| Feb 1–7 | 0 | 0 | 19 |
| Feb 8–14 | 0 | 0 | 24 |
| Feb 15–21 | 0 | 0 | 27 |
| Feb 22–28 | 0 | 0 | 27 |
| Mar 1–7 | 0 | 0 | 49 |
| Mar 8–14 | 0 | 0 | 49 |
| Mar 15–21 | 0 | 0 | 45 |
| Mar 22–28 | 0 | 0 | 43 |
| Mar 29 – Apr 4 | 0 | 0 | 95 |
| Apr 5–11 | 0 | 0 | 126 |
| Apr 12–18 | 0 | 0 | 210 |
| Apr 19–25 | 0 | 0 | 236 |
| Apr 26 – May 2 | 0 | 0 | 231 |
| May 3–9 | 0 | 0 | 289 |
| May 10–16 | 1 | 1 | 275 |
| May 17–23 | 1 | 1 | 190 |
| May 24–30 | 0 | 0 | 289 |
| May 31 – Jun 6 | 0 | 0 | 461 |
| Jun 7–13 | 0 | 0 | 274 |
| Jun 14–20 | 0 | 0 | 366 |
| Jun 21–27 | 0 | 0 | 324 |
| Jun 28 – Jul 4 | 0 | 0 | 334 |
| Jul 5–11 | 0 | 0 | 307 |
| Jul 12–18 | 0 | 0 | 468 |
| Jul 19–25 | 1 | 1 | 682 |
| Jul 26 – Aug 1 | 0 | 0 | 334 |
| Aug 2–8 | 0 | 0 | 304 |
| Aug 9–15 | 1 | 1 | 260 |
| Aug 16–22 | 1 | 1 | 345 |
| Aug 23–29 | 2 | 1 | 570 |
| Aug 30 – Sep 5 | 0 | 0 | 308 |
| Sep 6–12 | 0 | 0 | 990 |
| Sep 13–19 | 3 | 3 | 339 |
| Sep 20–26 | 2 | 2 | 281 |
| Sep 27 – Oct 3 | 2 | 2 | 254 |
| Oct 4–10 | 0 | 0 | 232 |
| Oct 11–17 | 4 | 3 | 181 |
| Oct 18–24 | 7 | 5 | 164 |
| Oct 25–31 | 1 | 1 | 102 |
| Nov 1–7 | 1 | 1 | 318 |
| Nov 8–14 | 0 | 0 | 89 |
| Nov 15–21 | 0 | 0 | 45 |
| Nov 22–28 | 0 | 0 | 42 |
| Nov 29 – Dec 5 | 0 | 0 | 51 |
| Dec 6–12 | 0 | 0 | 43 |
| Dec 13–19 | 0 | 0 | 18 |
| Dec 20–26 | 0 | 0 | 32 |
| Dec 27 – Jan 2 | 0 | 0 | 48 |
Reported as an adult
Only 6 records here are marked as adults, too few to show a adult season. One needs at least 20 records from 5 different years.
Reported as a larva
No records here are marked as larvae yet, so there is no larva season to show. One needs at least 20 records from 5 different years.
In Ohio
Late February to early November, middle week Aug 23–29
Records per week from 2,259 records in 10 of the 10 years from 2016 to 2025. Shows when people recorded it, not how common it is. The grey bars show how many records of all species were made here each week, so you can see when recording itself was high or low; the season is not adjusted by them.
Recorded on 1,258 dates. Latest record: December 2025.
Show as a table
| Week | Records of Brown Marmorated Stink Bug | Years recorded | Records of all species |
|---|---|---|---|
| Jan 4–10 | 15 | 6 | 6,211 |
| Jan 11–17 | 17 | 9 | 5,146 |
| Jan 18–24 | 9 | 5 | 4,645 |
| Jan 25–31 | 14 | 7 | 4,698 |
| Feb 1–7 | 12 | 4 | 6,023 |
| Feb 8–14 | 21 | 8 | 5,888 |
| Feb 15–21 | 13 | 4 | 5,436 |
| Feb 22–28 | 18 | 8 | 6,846 |
| Mar 1–7 | 17 | 5 | 8,321 |
| Mar 8–14 | 15 | 5 | 10,384 |
| Mar 15–21 | 22 | 6 | 12,620 |
| Mar 22–28 | 10 | 4 | 13,949 |
| Mar 29 – Apr 4 | 19 | 6 | 19,661 |
| Apr 5–11 | 33 | 8 | 26,860 |
| Apr 12–18 | 30 | 8 | 39,925 |
| Apr 19–25 | 18 | 7 | 41,623 |
| Apr 26 – May 2 | 37 | 9 | 56,391 |
| May 3–9 | 56 | 9 | 52,952 |
| May 10–16 | 49 | 7 | 53,785 |
| May 17–23 | 48 | 7 | 57,698 |
| May 24–30 | 40 | 9 | 54,651 |
| May 31 – Jun 6 | 27 | 6 | 53,099 |
| Jun 7–13 | 25 | 6 | 53,700 |
| Jun 14–20 | 31 | 10 | 56,625 |
| Jun 21–27 | 33 | 7 | 55,361 |
| Jun 28 – Jul 4 | 45 | 10 | 58,477 |
| Jul 5–11 | 43 | 9 | 61,336 |
| Jul 12–18 | 47 | 8 | 64,722 |
| Jul 19–25 | 45 | 7 | 69,753 |
| Jul 26 – Aug 1 | 54 | 10 | 59,416 |
| Aug 2–8 | 62 | 10 | 59,712 |
| Aug 9–15 | 65 | 10 | 55,994 |
| Aug 16–22 | 73 | 10 | 54,328 |
| Aug 23–29 | 68 | 10 | 51,772 |
| Aug 30 – Sep 5 | 117 | 9 | 57,167 |
| Sep 6–12 | 97 | 10 | 59,075 |
| Sep 13–19 | 100 | 10 | 54,543 |
| Sep 20–26 | 144 | 10 | 45,860 |
| Sep 27 – Oct 3 | 168 | 10 | 43,180 |
| Oct 4–10 | 137 | 10 | 37,841 |
| Oct 11–17 | 110 | 9 | 30,824 |
| Oct 18–24 | 45 | 10 | 21,156 |
| Oct 25–31 | 51 | 9 | 19,021 |
| Nov 1–7 | 27 | 9 | 14,172 |
| Nov 8–14 | 39 | 9 | 12,621 |
| Nov 15–21 | 11 | 4 | 7,965 |
| Nov 22–28 | 11 | 6 | 8,136 |
| Nov 29 – Dec 5 | 11 | 7 | 6,083 |
| Dec 6–12 | 19 | 7 | 6,004 |
| Dec 13–19 | 8 | 7 | 5,423 |
| Dec 20–26 | 16 | 5 | 5,661 |
| Dec 27 – Jan 2 | 17 | 7 | 8,459 |
Reported as an adult
No adult season shown here. Recorded through most of the year, so there is no single season to show.
Reported as a larva
No records here are marked as larvae yet, so there is no larva season to show. One needs at least 20 records from 5 different years.
What these results show
These results show when people recorded a species, not when or where it occurs. Missing weeks and low counts do not mean absence or scarcity, and counts are not abundance. Contributed records reflect where, when and what people chose to observe.
Identification
How to identify it
Often confused with
- Dusky Stink Bug Euschistus tristigmus168 identifications worldwide named one where the other was meant
- Brown Stink Bug Euschistus servus128 identifications worldwide named one where the other was meant
- Harlequin Bug Murgantia histrionica52 identifications worldwide named one where the other was meant
- Spined Soldier Bug Podisus maculiventris41 identifications worldwide named one where the other was meant
From iNaturalist’s similar-species counts, refreshed monthly: confusions in Ohio first, then worldwide. Only species with an Ohio result are listed.
Land cover where it is recorded
| Land cover | Its recordsAll Ohio records |
|---|---|
| Developed | 86%49% |
| Farmland | 8%11% |
| Forest | 5%31% |
| Grassland and shrub | 0.2%0.9% |
| Open water | 0.2%3% |
| Wetland | 0.2%5% |
| Barren | 0.1%0.6% |
From 1,435 records placed within 100 m, beside all Ohio records placed the same way. People record where they go, so this shows where records come from, not where the species lives. Land cover: USGS Annual NLCD, 2025 (opens in a new tab)
Sources
Where these results come from
- Records from iNaturalist research-grade observations and expert-identified GBIF datasets, CC0, CC BY and CC BY-NC. Sources
- Seasons use the published method and its evidence thresholds. Methods
- See it on iNaturalist (opens in a new tab)OpenPhenology is independent and not affiliated with iNaturalist.
Records behind the Ohio result
2,259 records from 2 datasets.
- iNaturalist Research-grade Observations (opens in a new tab) · iNaturalist.org · 2,248 recordsiNaturalist contributors, iNaturalist (2026). iNaturalist Research-grade Observations. iNaturalist.org. Occurrence dataset https://doi.org/10.15468/ab3s5x accessed via GBIF.org on 2026-11-13.
- iNaturalist observations (opens in a new tab) · iNaturalist.org · 11 recordsiNaturalist. Available from https://www.inaturalist.org. Accessed 2026-11-13
To cite: the GBIF download doi:10.15468/dl.y2jkt8 (opens in a new tab).
A spreadsheet (CSV) with a link to each record, on iNaturalist or GBIF. Records whose location was hidden by the observer or the source are counted but not linked.