Genetic Mapping of Rice Stink Bug Aids Crop Pest Control

Researchers discover genetic variation in native and invasive rice stink bug species, offering clues to manage insecticide resistance.

Published on Feb. 27, 2026

Got story updates? Submit your updates here. ›

Entomologists have published a first-of-its-kind study on the genetics of rice stink bugs, a major pest that costs Arkansas rice growers millions of dollars annually. The research found that the native rice stink bug species has more genetic variation than two invasive species found in Florida, indicating the pests are spreading across state lines. This knowledge can help design better monitoring and management strategies to combat insecticide resistance in the rice stink bug.

Why it matters

Rice stink bugs are a major agricultural pest, causing significant economic losses for rice and grain sorghum growers in the southeastern U.S. Understanding the genetic diversity of native and invasive rice stink bug populations is crucial for developing effective pest management strategies, especially as the insects develop resistance to common insecticides.

The details

The study, published in the journal Florida Entomologist, examined genetic samples of rice stink bugs from Arkansas, Mississippi, and Florida. Researchers discovered that the native species, Oebalus pugnax, has more genetic variation than the two invasive species found only in Florida, O. ypsilongriseus and O. insularis. This suggests the invasive species may be displacing the native pest in parts of the region. The findings also indicate rice stink bug populations are moving between states, which could contribute to the spread of insecticide resistance.

  • The rice stink bug has been a pest since the 1880s.
  • Insecticide resistance issues were first observed in Arkansas in the late 2019 growing season.
  • In 2020, some Arkansas farmers had to spray for rice stink bugs up to three times.
  • The insecticide resistance problem became a season-long issue in Arkansas starting in 2021.

The players

Allen Szalanski

Professor in the department of entomology and plant pathology for the Arkansas Agricultural Experiment Station and the Dale Bumpers College of Agricultural, Food and Life Sciences.

Nick Bateman

Associate professor and extension entomologist for the University of Arkansas System Division of Agriculture.

Ronald Cherry

Emeritus professor of entomology and nematology with the University of Florida Institute of Food and Agricultural Sciences.

Rich Adams

Statistician with the Arkansas Agricultural Experiment Station's Center for Agricultural Data Analytics and assistant professor with the department of entomology and plant pathology.

Oebalus pugnax

The native rice stink bug species found across the southeastern U.S.

Got photos? Submit your photos here. ›

What they’re saying

“They are found in every state that cultivates rice except for California. It's the No. 1 pest of rice during the heading stage, when grain is forming.”

— Allen Szalanski, Professor (miragenews.com)

“In 2021, the problem moved from a late-season issue to a season-long issue and has been that way since.”

— Nick Bateman, Associate Professor and Extension Entomologist (miragenews.com)

“We can't rule out other places, but Cuba could be a source. The interesting thing is why it hasn't been found outside of Florida in the United States.”

— Allen Szalanski, Professor (miragenews.com)

What’s next

Developing better molecular diagnostics is a goal for Szalanski as part of monitoring the invasive species and developing a molecular marker to detect an insecticide-resistance gene.

The takeaway

This genetic mapping research provides valuable insights into the population dynamics and spread of rice stink bugs, a major agricultural pest. The findings can help inform more effective pest management strategies, including monitoring for insecticide resistance, to protect crop yields and reduce economic losses for farmers.