Largus succinctus
(Linnaeus, 1763)
Largus bug, bordered plant bug, red bug, Eastern Bordered Plant Bug
Largus succinctus is a true in the Largidae, commonly called the Eastern Bordered Plant Bug. measure 13–17 mm and display black bodies with orange marginal markings. Nymphs are strikingly different: metallic blue-black with a central bright red spot. The is the sole eastern North American representative of its , ranging from New York to Florida and west to Minnesota, Oklahoma, and Colorado. It is a plant feeder with two annually.
Pronunciation
How to pronounce Largus succinctus: //ˈlɑːrɡəs suːkˈsɪŋktəs//
These audio files are automatically generated. While they are not always 100% accurate, they are a good starting point.
Identification
are distinguished from superficially similar stink bugs (Pentatomidae) by the orange border restricted to the pronotum and margins rather than full shield pattern. They differ from leaf-footed bugs (Coreidae) by lacking expanded hind tibiae. L. succinctus is separated from western Largus by geographic range: it is the only eastern species north of Florida. Nymphs are unmistakable due to metallic blue-black color with central red spot—no other common eastern nymph matches this pattern.
Images
Habitat
Found in diverse environments including residential neighborhoods, urban parks, mesquite grasslands, and desert scrub. Associated with various plants including Asteraceae (sunflower ), creosote bush, prickly pear cactus, and ornamental plantings. Overwinters in cracks and crevices around structures.
Distribution
Eastern North America: from New York south to Florida, west to Minnesota, Oklahoma, Colorado, and possibly Arizona. It is the only Largus in this eastern range; greatest diversity occurs in the southwestern United States.
Seasonality
overwinter and become active in spring. hatch in approximately 14 days. Nymphs progress through five instars over roughly 100 days. Two per year. Adults live 2–7 months. Peak nymphal activity observed in March–May in southern locations.
Diet
feeder on plant sap, using . Documented on Asteraceae, berries, tomatoes, stone fruits, and various ornamentals. Has been observed feeding on fecal material and carrion, suggesting opportunistic scavenging .
Host Associations
- Asteraceae - food sourceespecially fond of this per Kimsey identification
- Rubus - food sourceraspberries, blackberries; reported as damaged in large numbers
- Prunus - food sourcestone fruits including plums
- Fragaria - food sourcestrawberries frequently reported
- Solanum lycopersicum - food sourcetomatoes
- Opuntia - /foodprickly pear cactus pads used by nymphs
- Larrea tridentata - /foodcreosote bush in desert
Life Cycle
(hemimetabolous). Females lay in clusters on the ground, averaging 130 eggs per cluster. Eggs hatch in ~14 days. Five nymphal instars, requiring ~100 days total. are flightless and live 2–7 months. Two annually in most of range.
Behavior
Nymphs aggregate in large groups, likely amplifying aposematic (warning) coloration. and nymphs are alert and will hide or drop when disturbed. Some lizards find largids distasteful, suggesting chemical defense. Adults have been reported flying, though typically described as flightless—this may represent short or variation.
Ecological Role
herbivore contributing to nutrient cycling through plant sap feeding and occasional scavenging. Serves as prey for lizards and other , though chemical defenses may limit . irruptions may occur, potentially altering local plant dynamics.
Human Relevance
Minor agricultural and garden pest: large can damage berry crops, tomatoes, and stone fruits by sucking plant juices. Not known to bite humans or pets, and not a of . Often mistaken for stink bugs or beetles, leading to unnecessary applications. Native with natural fluctuations.
Similar Taxa
- Largus californicusWestern ; nymphs similar but first instars are red rather than blue-black; overlap in some areas but L. succinctus is eastern
- Boisea trivittata (Boxelder Bug)Similar size and color pattern but has three longitudinal stripes rather than marginal border; different (Rhopalidae)
- Nezara viridula (Southern Green Stink Bug)Shield-shaped and green with some color variants, but lacks orange marginal border; Pentatomidae with different structure
- Leptoglossus spp. (Leaf-footed Bugs)Similar body shape but hind legs have flattened, leaf-like expansions; Coreidae
Misconceptions
More Details
Taxonomic History
Largids were formerly classified in Pyrrhocoridae (cotton strainers). boundaries within Largus remain contentious, with many described based on color pattern and geography; L. succinctus represents a stable eastern entity.
Population Dynamics
can exhibit dramatic irruptions, with reports of millions of individuals in localized areas following environmental disturbances such as forest fires. These events may reflect displacement from native rather than true pest status.
Chemical Defense
The bright coloration of nymphs suggests aposematism. Anecdotal reports of lizards avoiding largids support the hypothesis of chemical deterrence, though specific compounds have not been characterized.