SDSU Leads Fight Against Harmful Invasive Species

By Scout Nelson

Researchers at South Dakota State University (SDSU) are on the front line of the battle against invasive species. Their work focuses on protecting forests and grasslands from serious threats that harm plants, animals, and the environment.

One of the main pests causing concern is the emerald ash borer, a shiny green beetle that destroys ash trees. First found in South Dakota in 2018, this insect recently reached Brookings County. SDSU professor John Ball has been preparing for this since the early 2000s. He and his team studied how many trees were at risk and created plans to protect them.

Ball’s research shows that some ash trees, especially in cities, can be saved by injecting insecticide into their trunks. While it is unlikely the pest can be fully removed, slowing its spread is possible. Rules like firewood movement quarantines are helping to give experts more time to find lasting solutions.

SDSU is also addressing the threat of eastern redcedar trees, which are invading South Dakota’s grasslands. Professors Lan Xu and Alexander Smart study how these trees grow and hurt native habitats. These trees spread because of fewer natural fires and planting in windbreaks. Without fire to stop them, redcedars have moved from riverbanks into open grasslands.

These trees block sunlight, stop native plants from growing, and give cover to predators. To fight back, SDSU researchers are exploring natural solutions. One idea involves goats, which eat bark and leaves. Goats have special stomachs that help them digest woody plants, and they often strip bark just for fun. This behavior might help stop redcedar growth in grasslands.

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