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Extension > Agriculture > Crops > Soybean Production > Insects & mites > Stink bugs in Minnesota soybean

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Stink bugs in Minnesota soybean

Robert Koch, Extension entomologist
2015

one-spotted stink bug

Photo: Ione L. BugGuide.net

brown stink bug

Photo: Russ Ottens, University of Georgia, Bugwood.org


green stink bug

Photo: Daren Mueller, Iowa State University, Bugwood.org

spined soldier bug

Photo: Phil Sloderbeck, Kansas State University, Bugwood.org

Figure 1. Stink bug species commonly found in Minnesota soybean. Plant feeding species: (A) one-spotted, (B) brown, and (C) green stink bugs; Predatory specie: (D) spined soldier bug

Name

Several species of stink bugs (Pentatomidae) can be found in soybean.

Identification

Adults

Eggs

Eggs are barrel–shaped and often laid under leaves.

Nymphs

Natural history

Most species undergo 1 to 2 generations per year.

Most feed on various crop and wild plants.

Most overwinter as adults under leaf litter and loose bark, but some are household invaders.

Impacts

stink bug feeding on soybean pod

Photo: Dr. Suhas Vyavhare, Texas A&M Agrilife Research and Extension Center

Figure 2. Injury to soybean caused by stink bug feeding.

Prefer to feed on pods and developing seeds.

Penetrate plant tissues with proboscis, inject digestive enzymes, and remove nutrients.

Feeding causes abortion, deformation, and discoloration of seed, which can affect yield and quality (Figure 2).

Feeding can also cause delayed plant maturity ("stay–green syndrome").

Scouting and management

Stink bugs have infrequently reached economically significant levels in Minnesota, but invasive species and reported increases in abundance of native species could result in increased infestations.

Scouting

Treatment thresholds

Labeled rates for insecticides should be used for treating stink bugs and follow directions on the product label.

Fields should be scouted after treatment to check for re–colonization.

Be on the lookout

brown marmorated stink bug

Photo: S. Valley, Oregon Department of Agriculture, Bugwood.org

Figure 3. Brown marmorated stink bug. Note the bands on the antennae, alternating dark–light pattern on abdomen and wing veins outlined in black.

The brown marmorated stink bug has recently invaded Minnesota. This species looks similar to some of the native species, but can be distinguished by the light–colored bands on the antennae and the alternating dark–light pattern on the edge of the abdomen (Figure 3). In addition, under close inspection, the veins of the membranous parts of the wings are outlined in black.

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