Pest profile

Magnolia Leaf-Footed Bug

Leptoglossus fulvicornis · Hemiptera: Coreidae[2]

Magnolia leaf-footed bugs feed only on magnolias, spotting the seeds without affecting tree health, so control is generally not needed.[1]

Dark brown magnolia leaf-footed bug resting on white siding
Dark brown magnolia leaf-footed bug resting on white siding. (c) ncb1221, some rights reserved (CC BY) — via iNaturalist, CC BY 4.0

How to identify it

  • Adults are uniformly dark brown with lighter brown antennae and front and middle legs.[1]
  • They lack the white crossband of similar species and have flared, toothed 'shoulders' on the pronotum.[1]
  • Young nymphs gather in circles on egg masses and leaves; older nymphs and adults sit on the fruits.[1]

Look-alikes

Look-alikeHow to tell them apart
Western conifer seed bugHas a transverse white stripe that the magnolia leaf-footed bug lacks.[1]
Leptoglossus oppositusAlso uniformly dark brown, but with smaller 'shoulders' and more scalloped flanges on the hind legs.[1]
Squash bugLacks the wide, leaf-like flanges on the hind legs entirely.[1]

Where it lives

It's found in eastern North America from Ontario and Massachusetts to Florida and west to Arkansas and Texas, most commonly in the South.[1]

US map: public records from 24 states since 1990 (GBIF).

Biology and life cycle

Adults overwinter in leaf litter at the base of magnolias and become active when small fruits appear, mid-June to early July in Pennsylvania.[1]

Eggs are laid in chains, usually along the midrib under a leaf, about 20 to 27 to a clutch.[1]

Hosts include southern, star, saucer and sweetbay magnolias and cucumber tree; it rarely turns up on other trees.[1]

Damage and signs

  • Older nymphs and adults pierce developing fruit and seeds, spotting and pitting the seeds without hurting the tree's overall health.[1]
  • Shiny black patches of excrement can show up on leaves.[1]

Health risk

They feed only on magnolia and won't bite people; the one recorded accidental bite from a related seed bug caused intense pain and a slow-fading welt.[1]

Control

Sanitation

Removing leaf litter under magnolias in fall and spring takes out overwintering adults before they emerge.[1]

Traps and physical control

If you want control anyway, knock flightless young nymphs off the leaves with a strong jet of water.[1]

Biological control

Parasitic wasps attack the eggs; one study found 77 percent of egg masses parasitized.[1]

Common questions

Are the brown bugs on my magnolia's seed pods harmful?
Probably magnolia leaf-footed bugs; they spot the seeds but don't affect the tree's health.[1]
Do magnolia leaf-footed bugs bite?
No. They feed only on magnolia and pose no threat to human health.[1]

Sources

  1. Penn State Extension, “Magnolia Leaf-Footed Bug.” extension.psu.edu/magnolia-leaf-footed-bug (accessed 2026-10-06)
  2. iNaturalist, “Leptoglossus fulvicornis taxon page (order and family).” www.inaturalist.org/taxa/129430 (accessed 2026-10-06)

Updated 2026-10-14. Built from sourced records. Spot an error? Tell us.