Large Milkweed Bug
Oncopeltus (Erythrischius) fasciatus (Dallas, 1852)
Large Milkweed Bug in all of OhioRange
Where it is recorded
Season shown in 14 of Ohio's 88 counties. Explore Ohio
- No result yet (11)
- Recorded, too few records for a result (51)
- Recorded, season not shown (12)
- Season shown (14)
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 | 23 · Season shown |
| Athens County | 33 · Season shown |
| Auglaize County | No qualifying records yet |
| Belmont County | Recorded, too few records for a result |
| Brown County | Recorded, too few records for a result |
| Butler County | 76 · 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 | 50 · 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 | 299 · Season shown |
| Darke County | Recorded, too few records for a result |
| Defiance County | Recorded, too few records for a result |
| Delaware County | 39 · Recorded, season not shown |
| Erie County | 25 · Season shown |
| Fairfield County | Recorded, too few records for a result |
| Fayette County | Recorded, too few records for a result |
| Franklin County | 280 · Season shown |
| Fulton County | Recorded, too few records for a result |
| Gallia County | Recorded, too few records for a result |
| Geauga County | 21 · Recorded, season not shown |
| Greene County | 51 · Recorded, season not shown |
| Guernsey County | No qualifying records yet |
| Hamilton County | 307 · Season shown |
| Hancock County | 22 · Recorded, season not shown |
| Hardin County | Recorded, too few records for a result |
| Harrison County | Recorded, too few records for a result |
| Henry County | Recorded, too few records for a result |
| 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 | No qualifying records yet |
| Jackson County | No qualifying records yet |
| Jefferson County | No qualifying records yet |
| Knox County | Recorded, too few records for a result |
| Lake County | 62 · Season shown |
| Lawrence County | No qualifying records yet |
| Licking County | 57 · Season shown |
| Logan County | Recorded, too few records for a result |
| Lorain County | 73 · Season shown |
| Lucas County | 179 · Recorded, season not shown |
| Madison County | Recorded, too few records for a result |
| Mahoning County | Recorded, too few records for a result |
| Marion County | Recorded, too few records for a result |
| Medina County | 43 · Season 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 | No qualifying records yet |
| Montgomery County | 77 · Season 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 | Recorded, too few records for a result |
| Ottawa County | 22 · Recorded, season not shown |
| Paulding County | Recorded, too few records for a result |
| 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 | 29 · Recorded, season not shown |
| Preble County | Recorded, too few records for a result |
| Putnam County | No qualifying records yet |
| Richland County | 40 · Recorded, season not shown |
| Ross County | No qualifying records yet |
| 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 | 54 · Recorded, season not shown |
| Summit County | 186 · Season 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 | Recorded, too few records for a result |
| Warren County | 37 · Recorded, season not shown |
| Washington County | Recorded, too few records for a result |
| Wayne County | 27 · Recorded, season not shown |
| Williams County | Recorded, too few records for a result |
| Wood County | 26 · Season shown |
| 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 Erie County
Mid-July to mid-October, middle week Aug 16–22
Records per week from 25 records in 6 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 20 dates. Latest record: September 2025.
Show as a table
| Week | Records of Large Milkweed Bug | Years recorded | Records of all species |
|---|---|---|---|
| Jan 4–10 | 0 | 0 | 47 |
| Jan 11–17 | 0 | 0 | 75 |
| Jan 18–24 | 0 | 0 | 52 |
| Jan 25–31 | 0 | 0 | 67 |
| Feb 1–7 | 0 | 0 | 70 |
| Feb 8–14 | 0 | 0 | 21 |
| Feb 15–21 | 0 | 0 | 52 |
| Feb 22–28 | 0 | 0 | 60 |
| Mar 1–7 | 0 | 0 | 90 |
| Mar 8–14 | 0 | 0 | 90 |
| Mar 15–21 | 0 | 0 | 79 |
| Mar 22–28 | 0 | 0 | 93 |
| Mar 29 – Apr 4 | 0 | 0 | 82 |
| Apr 5–11 | 0 | 0 | 499 |
| Apr 12–18 | 0 | 0 | 555 |
| Apr 19–25 | 0 | 0 | 531 |
| Apr 26 – May 2 | 0 | 0 | 590 |
| May 3–9 | 0 | 0 | 519 |
| May 10–16 | 0 | 0 | 765 |
| May 17–23 | 0 | 0 | 697 |
| May 24–30 | 0 | 0 | 548 |
| May 31 – Jun 6 | 0 | 0 | 427 |
| Jun 7–13 | 0 | 0 | 381 |
| Jun 14–20 | 0 | 0 | 384 |
| Jun 21–27 | 0 | 0 | 273 |
| Jun 28 – Jul 4 | 1 | 1 | 316 |
| Jul 5–11 | 0 | 0 | 605 |
| Jul 12–18 | 0 | 0 | 329 |
| Jul 19–25 | 1 | 1 | 514 |
| Jul 26 – Aug 1 | 1 | 1 | 527 |
| Aug 2–8 | 2 | 2 | 409 |
| Aug 9–15 | 4 | 2 | 422 |
| Aug 16–22 | 4 | 3 | 699 |
| Aug 23–29 | 4 | 2 | 309 |
| Aug 30 – Sep 5 | 0 | 0 | 440 |
| Sep 6–12 | 1 | 1 | 392 |
| Sep 13–19 | 0 | 0 | 444 |
| Sep 20–26 | 2 | 1 | 398 |
| Sep 27 – Oct 3 | 0 | 0 | 248 |
| Oct 4–10 | 2 | 1 | 260 |
| Oct 11–17 | 1 | 1 | 148 |
| Oct 18–24 | 1 | 1 | 176 |
| Oct 25–31 | 1 | 1 | 161 |
| Nov 1–7 | 0 | 0 | 149 |
| Nov 8–14 | 0 | 0 | 78 |
| Nov 15–21 | 0 | 0 | 49 |
| Nov 22–28 | 0 | 0 | 72 |
| Nov 29 – Dec 5 | 0 | 0 | 71 |
| Dec 6–12 | 0 | 0 | 27 |
| Dec 13–19 | 0 | 0 | 29 |
| Dec 20–26 | 0 | 0 | 54 |
| Dec 27 – Jan 2 | 0 | 0 | 61 |
Reported as an adult
Only 11 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 June to mid-October, middle week Sep 6–12
Records per week from 3,017 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 1,003 dates. Latest record: November 2025.
Show as a table
| Week | Records of Large Milkweed Bug | Years recorded | Records of all species |
|---|---|---|---|
| Jan 4–10 | 0 | 0 | 6,211 |
| Jan 11–17 | 0 | 0 | 5,146 |
| Jan 18–24 | 0 | 0 | 4,645 |
| Jan 25–31 | 0 | 0 | 4,698 |
| Feb 1–7 | 0 | 0 | 6,023 |
| Feb 8–14 | 3 | 1 | 5,888 |
| Feb 15–21 | 0 | 0 | 5,436 |
| Feb 22–28 | 0 | 0 | 6,846 |
| Mar 1–7 | 0 | 0 | 8,321 |
| Mar 8–14 | 0 | 0 | 10,384 |
| Mar 15–21 | 1 | 1 | 12,620 |
| Mar 22–28 | 0 | 0 | 13,949 |
| Mar 29 – Apr 4 | 0 | 0 | 19,661 |
| Apr 5–11 | 0 | 0 | 26,860 |
| Apr 12–18 | 0 | 0 | 39,925 |
| Apr 19–25 | 0 | 0 | 41,623 |
| Apr 26 – May 2 | 0 | 0 | 56,391 |
| May 3–9 | 1 | 1 | 52,952 |
| May 10–16 | 0 | 0 | 53,785 |
| May 17–23 | 1 | 1 | 57,698 |
| May 24–30 | 8 | 3 | 54,651 |
| May 31 – Jun 6 | 7 | 3 | 53,099 |
| Jun 7–13 | 14 | 5 | 53,700 |
| Jun 14–20 | 20 | 7 | 56,625 |
| Jun 21–27 | 42 | 9 | 55,361 |
| Jun 28 – Jul 4 | 81 | 9 | 58,477 |
| Jul 5–11 | 92 | 10 | 61,336 |
| Jul 12–18 | 110 | 10 | 64,722 |
| Jul 19–25 | 144 | 10 | 69,753 |
| Jul 26 – Aug 1 | 127 | 10 | 59,416 |
| Aug 2–8 | 161 | 9 | 59,712 |
| Aug 9–15 | 146 | 10 | 55,994 |
| Aug 16–22 | 164 | 10 | 54,328 |
| Aug 23–29 | 180 | 10 | 51,772 |
| Aug 30 – Sep 5 | 189 | 10 | 57,167 |
| Sep 6–12 | 239 | 10 | 59,075 |
| Sep 13–19 | 248 | 10 | 54,543 |
| Sep 20–26 | 220 | 10 | 45,860 |
| Sep 27 – Oct 3 | 253 | 10 | 43,180 |
| Oct 4–10 | 221 | 10 | 37,841 |
| Oct 11–17 | 133 | 10 | 30,824 |
| Oct 18–24 | 67 | 10 | 21,156 |
| Oct 25–31 | 51 | 8 | 19,021 |
| Nov 1–7 | 43 | 8 | 14,172 |
| Nov 8–14 | 26 | 7 | 12,621 |
| Nov 15–21 | 15 | 5 | 7,965 |
| Nov 22–28 | 6 | 3 | 8,136 |
| Nov 29 – Dec 5 | 1 | 1 | 6,083 |
| Dec 6–12 | 2 | 1 | 6,004 |
| Dec 13–19 | 0 | 0 | 5,423 |
| Dec 20–26 | 0 | 0 | 5,661 |
| Dec 27 – Jan 2 | 1 | 0 | 8,459 |
Reported as an adult
Usually reported as an adult late June to mid-October, middle week Aug 9–15.
From 699 records that are marked as adults. Not every photo is marked with a life stage, so this shows when people reported it as an adult, not when adults are about.
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
- False Milkweed Bug Lygaeus turcicusOften confused in Ohio: 38 identifications in Ohio named one where the other was meant
- Red Milkweed Beetle Tetraopes tetrophthalmusOften confused in Ohio: 20 identifications in Ohio named one where the other was meant
- Asian Lady Beetle Harmonia axyridis21 identifications worldwide named one where the other was meant
- Lily Leaf Beetle Lilioceris lilii21 identifications worldwide named one where the other was meant
- Reticulated Net-winged Beetle Calopteron reticulatum14 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.
When each is reported
- All recordsUsually late June to mid-October, middle week early September · 3,017 records
- Reported as an adultUsually late June to mid-October, middle week early August · 699 records
Not every photo is marked with a sex or a sign, so these show when people reported each, not when it happens.
Months not reported
- Jan: no record
- Feb: recorded
- Mar: recorded
- Apr: recorded
- May: recorded
- Jun: recorded
- Jul: recorded
- Aug: recorded
- Sep: recorded
- Oct: recorded
- Nov: recorded
- Dec: recorded
Not reported in Ohio in January, 2016 to 2025.
Land cover where it is recorded
| Land cover | Its recordsAll Ohio records |
|---|---|
| Developed | 73%49% |
| Farmland | 16%11% |
| Forest | 7%31% |
| Wetland | 3%5% |
| Grassland and shrub | 0.7%0.9% |
| Open water | 0.7%3% |
| Barren | 0.5%0.6% |
From 1,871 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 Erie County result
25 records from 1 dataset.
- iNaturalist Research-grade Observations (opens in a new tab) · iNaturalist.org · 25 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.
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.