Missouri Soybean Growers Warned of Rising Stink Bug Pressure

By Blake Jackson

Stink bugs continue to pose a major challenge for Missouri soybean growers, and new research from the University of Missouri is offering farmers clearer guidance on when and where to scout fields for the pests.

The statewide study, conducted during the 2024 and 2025 growing seasons, surveyed 316 commercial soybean fields across Missouri. Researchers used sweep nets to collect more than 2,700 stink bugs representing nine different species.

The findings, led by MU Extension entomologist Ivair Valmorbida, were published in the journal Environmental Entomology.

“These results provide the first comprehensive, statewide assessment of stink bug community and spatial distribution in Missouri soybeans that can be used to improve scouting timing and management decisions,” said Valmorbida.

Researchers found that the green stink bug, scientifically known as Chinavia hilaris, was by far the most common species, accounting for more than 80% of all insects collected.

The one-spotted stink bug and brown stink bug followed at much lower levels, while all other species represented less than 1% of the total population.

The brown marmorated stink bug was also identified in limited numbers, while the red-banded stink bug was not detected during the study.

The research showed that stink bug populations were noticeably higher along soybean field edges than in interior areas. Scientists believe the insects move into fields from wooded borders, crop residue, and nearby vegetation before spreading throughout the crop.

Because of this pattern, researchers recommend growers begin scouting along field edges while still monitoring entire fields throughout the season.

The study also found that stink bug pressure rises sharply during reproductive growth stages, especially around the R6 full-seed stage when soybeans are highly vulnerable to feeding damage. Stink bugs can reduce yields, harm seed quality, and delay crop maturity.

“For Missouri producers, the takeaway is simple: pay close attention to field edges, monitor fields carefully during reproductive growth stages, and continue scouting throughout the field as the season progresses,” said Valmorbida.

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