Tarnished plant bug vs Four-lined plant bug
These two are easy to mix up. Here's how to tell a tarnished plant bug from a four-lined plant bug, and whether either one bites or stings.
Tarnished plant bug
Lygus lineolaris
Four-lined plant bug
Poecilocapsus lineatus
≠The key differences
Lygus is more mottled brown/green without the regular four longitudinal stripes; Lygus also attacks a broader range of herbaceous crops.
⚖︎Side by side
| Tarnished plant bug | Four-lined plant bug | |
|---|---|---|
| To humans | Non-toxic | Non-toxic |
| Size | 4.5-6.5 mm long | 6-8 mm body length |
| Colours | Brown, Olive green, Pale yellow | Yellow, Orange, Dark brown, Black |
| Family | Miridae | Miridae |
| Habitat | Field margins, weedy areas, meadows, crop fields, gardens and orchards — anywhere host plants are present | Gardens, herb beds, perennial borders, nurseries, parks and woodland edges where host plants grow |
| Range | Throughout North America, from southern Canada to Mexico; most abundant in the east and Midwest | Native to eastern North America; common across the eastern United States and Canada, and reported in some adjacent regions |
| Active | Spring through fall (multiple generations in warm regions); active during daylight hours | Active in spring and early summer (nymphs and newly emerged adults); adults may persist into summer depending on climate |
| Pest? | Yes | Yes |
🔍How to spot a tarnished plant bug
- Adults 4.5-6.5 mm long, elongate-oval, mottled brown-green with pale yellow patches
- Small triangular scutellum between the wing bases, often with a pale yellowish V or Y mark
- Nymphs are wingless, smaller, and often greener; later instars have visible wing pads
- Variable markings — identification to species may require examination of subtle markings or expert confirmation for some Lygus species
🔍How to spot a four-lined plant bug
- Four distinct longitudinal dark stripes on a yellow-orange body and wings in adults
- Small size: adults about 6-7 mm long
- Nymphs are bright orange to red when young and lack wings
- Damage to young leaves: whitish stippling or raised spots that later brown
?Frequently asked questions
What is the difference between a tarnished plant bug and a four-lined plant bug?
Lygus is more mottled brown/green without the regular four longitudinal stripes; Lygus also attacks a broader range of herbaceous crops.
Is a tarnished plant bug or a four-lined plant bug more dangerous?
Tarnished plant bug: Non-toxic. Four-lined plant bug: Non-toxic. Tarnished plant bugs are not venomous and are not medically significant. Four-lined plant bugs do not have a venomous bite and are not known to transmit disease.
Identification from photos is never certain: don't handle insects you can't identify, and get medical advice for bites, stings or allergic reactions.