Bug FAQRapid Plant Bug
Adelphocoris rapidus · Order: Hemiptera · Family: Miridae
Source: Wikipedia
The rapid plant bug is a relatively large mirid, about 7 mm long, with yellow-brown pronotum and two black spots near the hind margin. Females lay 35 to 100 eggs; the nymph passes through five stages over about 15 days before becoming an adult.
Source: Wikipedia
Size
They are larger than most mirids, measuring roughly 7 to 8 mm (0.28 to 0.31 in). Measured adults are 6.8 to 7.4 mm (0.27 to 0.29 in) long.
Source: Wikipedia
Where it lives
The species is found across the United States except the central region and in the Peace to Athabasca Delta of Canada.
Source: Wikipedia
What it eats
It feeds on alfalfa and sweet clover.
Source: Wikipedia
Life cycle
Females can lay between 35 and 100 eggs. Nymphs have five developmental stages that together take about 15.4 days, with each stage lasting roughly 1.8 to 4.8 days.
Source: Wikipedia
Lookalikes
Unlike those bugs, the rapid plant bug’s abdomen and thorax lack the dark spots typical of tarnished and pale legume bugs.
Source: Wikipedia
Where it is found in the US
Recorded in 43 of 51 states and DC. Most records: Illinois, New Mexico, California, Utah, Minnesota, Mississippi, Ohio, Colorado.
Darker = more records. Counts are museum and citizen-science records, not population size.
Source: GBIF
Status: native in North America; native in Canada. Source: iNaturalist
Months it is reported in the US
Source: GBIF
More photos
Questions people ask
What plants does the rapid plant bug damage?
It feeds on alfalfa, sweet clover and vegetables like beans, carrots, celery and potatoes, which can harm crops and garden plants.
Source: Wikipedia
How big is the rapid plant bug?
Adults are about 7 mm long, making them larger than most other mirid bugs.
Source: Wikipedia
Where can I find rapid plant bugs?
They are found throughout most of the United States except the central region and in the Peace to Athabasca Delta of Canada.
Source: Wikipedia
Same family (Miridae)
North American Tarnished Plant BugLygus lineolarisDamages trees, gardens or crops
Red-spotted Plant BugDeraeocoris ruber
Alfalfa Plant BugAdelphocoris lineolatusDamages trees, gardens or crops
Meadow Plant BugLeptopterna dolabrataDamages trees, gardens or crops
Four-lined Plant BugPoecilocapsus lineatusDamages trees, gardens or crops
Lygus pratensisLygus pratensisDamages trees, gardens or cropsSources
- Wikipedia: https://en.wikipedia.org/wiki/Adelphocoris_rapidus
Look it up elsewhere: GBIF · iNaturalist · BugGuide · ITIS · Wikipedia
Text written 2026-10-24 from the sources above and checked sentence by sentence against them. Data fetched 2026-10-24.