Brown Marmorated Stink Bugs and Common Look-Alikes Paul Botch Department of Entomology Michigan State University botchpau@msu.edu Objective Provide identification tips to reliably distinguish the new invasive pest brown marmorated stink bug () from look-alike native stink bugs of Michigan. Life Cycle 1
Seasonal Habitat Use Order: Hemiptera Suborder: Heteroptera True bugs Key characteristics: Forewing thickened at base and membranous at tip (Hemelytra). Mouthparts haustellate (tubular). Beak arising from anterior part of head. Stink Bugs Family: Pentatomidae Anatomy of a Stink Bug Hebert et al. 2014 Hebert et al. 2014 2
Beetles vs. True Bugs Forewing thickened & shell-like (Elytra). Forewing thickened at base and membranous at tip (Hemelytra) Head Pronotum Hemelytron Hemelytra = Half sheath Piercing Sucking Mouthparts Hebert et al. 2014 3
Other Identifying Characteristics of Stink Bugs Sometimes called shield bugs. Trapezoidal shape. Other Identifying Characteristics of Stink Bugs Sometimes called shield bugs. 5 segments Trapezoidal shape. Antennae: 5 segments. Tarsi: 3 segments. 3 segments Other Identifying Characteristics of Stink Bugs Sometimes called shield bugs. Trapezoidal shape. Antennae: 5 segments. Tarsi: 3 segments. Defensive secretion from thorax when disturbed. 4
More than 75 species in Michigan More than 75 species in Michigan Brown Marmorated Stink Bug Halyomorpha halys (Stål) Habitat: Urban structures. Woodlots. Weedy riparian habitat. Agricultural areas. Feeds on >300 plants. Appearance: Mottled brown. Alternating dark, light bands on antennae & legs. Black & white striping along sides of abdomen. Smooth shoulders. Length 12.0 17.0 mm. 5
Brown Marmorated Stink Bug Halyomorpha halys (Stål) Habitat: Urban structures. Woodlots. Weedy riparian habitat. Agricultural areas. Feeds on >300 plants. Appearance: Mottled brown. Alternating dark, light bands on antennae & legs. Black & white striping along sides of abdomen. Smooth shoulders. Length 12.0 17.0 mm. Brown Stink Bugs Euschistus spp. Genus of brown stink bugs includes: The Brown Stink Bug, Euschistus servus (Say). The Dusky Stink Bug, Euschistus tristigmus (Say). The Onespotted Stink Bug, Euschistus variolarius (Palisot de Beauvois). 7 species total in Michigan. Habitat: Meadows, golden-rod, mullein, woodlots. Appearance: No banding on antennae or legs. Rounded or pointed shoulders. Length 8.0 15.0 mm. Brown Stink Bugs Euschistus spp. Genus of brown stink bugs includes: The Brown Stink Bug, Euschistus servus (Say). The Dusky Stink Bug, Euschistus tristigmus (Say). The Onespotted Stink Bug, Euschistus variolarius (Palisot de Beauvois). 7 species total in Michigan. Habitat: Meadows, golden-rod, mullein, woodlots. Euschistus spp. Appearance: No banding on antennae or legs. Rounded or pointed shoulders. Length 8.0 15.0 mm. 6
Spined Soldier Bug Podisus maculiventris (Say) Habitat: Meadows and goldenrod. Feeds on caterpillars and bees. Appearance: Pointed shoulders. Two dark spots near apex of hind femur. Length 8.5-13.0 mm. Spined Soldier Bug Podisus maculiventris (Say) Habitat: Meadows and goldenrod. Feeds on caterpillars and bees. Appearance: Pointed shoulders. Two dark spots near apex of hind femur. Length 8.5-13.0 mm. Paiero et al. 2013 P. maculiventris Coenus delius (Say) Habitat: Grasses and herbaceous plants. Appearance: Grayish-brown coloration. Short corium. Length 8.5 10.5 mm. Paiero et al. 2013 7
Coenus delius (Say) Habitat: Grasses and herbaceous plants. Appearance: C. delius Grayish-brown coloration. Short corium. Length 8.5 10.5 mm. Rough Stink Bug Brochymena quadripustulata (Fabricius) Habitat: Variety of trees, herbaceous plants, grasses. Appearance: Cryptic bark-like coloration. Legs with white bands. Banding on sides of abdomen. Margin of pronotum distinctly toothed. Length 10.0-18.0 mm. Rough Stink Bug Brochymena quadripustulata (Fabricius) Habitat: Variety of trees, herbaceous plants, grasses. Appearance: Cryptic bark-like coloration. Legs with white bands. Banding on sides of abdomen. Margin of pronotum distinctly toothed. Length 10.0-18.0 mm. B. quadripustulata 8
Holcostethus limbolarius (Stål) Habitat: Meadows. Feeds on herbaceous plants, grasses, fruit trees. Appearance: Pale margin of pronotum and abdomen. Similar in appearance to other brown stink bugs (Euschistus spp.). Length 7.0 9.0 mm. Paiero et al. 2013 Holcostethus limbolarius (Stål) Habitat: Meadows. Feeds on herbaceous plants, grasses, fruit trees. H. limbolarius Appearance: Pale margin of pronotum and abdomen. Similar in appearance to other brown stink bugs (Euschistus spp.). Length 7.0 9.0 mm. Menecles insertus (Say) Habitat: Forested areas. Feeds on deciduous trees. Appearance: Oval and flattened appearance. White strip cuts pronotum lengthwise. Length 12.0 14.0 mm. 9
Menecles insertus (Say) Habitat: Forested areas. Feeds on deciduous trees. Appearance: Oval and flattened appearance. White strip cuts pronotum lengthwise. Length 12.0 14.0 mm. M. insertus What Else Can Be Mistaken For? Western Conifer-Seed Bug, Leptoglossus occidentalis (Heidemann). Family: Coreidae Boxelder Bug, Boisea trivittata (Say). Family: Rhopalidae http://bugoftheweek.com/blog/2013/9/13/the-gatheringstorm-brown-marmorated-stink-bug-ihalyomorpha-halysi Pop Quiz! A E B C F D G 10
Identification Striped Antennae Native Stink Bug Identification Native Stink Bug Striped Legs Identification Native Stink Bug Smooth Shoulder Margins 11
Identification Native Stink Bug Smooth Shoulder Margins Identification Native Stink Bug Smooth shoulders Toothed shoulders Paiero et al. 2013 Identification Native Stink Bug Rounded Shoulder Apex 12
Identification Native Stink Bug Shield or Trapezoidal Shape Identification (Size Matters) Identification 13
References Swanson, D.R. 2012. An updated synopsis of the Pentatomoidea (Heteroptera) of Michigan. The Great Lakes Entomologist. 45: 263-311. Hebert et al. 2014. Field guide to stink bugs of agricultural importance in the United States. Second Edition. Virginia IPM Program. Paiero, S.M., S.A. Marshall, J.E. McPherson, and M.-S. Ma. 2013. Stink bugs (Pentatomidae) and parent bugs (Acanthosomatidae) of Ontario and adjacent areas: A key to species and a review of the fauna. Canadian Journal of Arthropod Identification. 24: 1-183. Questions? 14