Episode Details

Emerald ash borer continues to spread across the South, threatening ash trees in forests, urban areas, and important bottomland hardwood ecosystems. In this episode of Timber University, Dr. Colin Bonser, an entomologist with Forest Health Protection in the USDA Forest Service, joins us to discuss emerald ash borer, how it is detected and monitored, and what its continued spread could mean for southern forests.

Dr. Bonser explains how emerald ash borer attacks ash trees by feeding on vascular tissue beneath the bark, eventually girdling and killing the tree. We discuss common signs of infestation, including crown dieback, epicormic branching, D-shaped exit holes, and increased woodpecker activity. The conversation also covers Forest Service monitoring efforts, including the use of prism traps and attractant lures to detect new infestations.

Recent detections in Louisiana are particularly important for Mississippi. Bonser discusses new detections in parishes along the Mississippi River and ongoing monitoring on the Mississippi side, including the Delta National Forest. Because ash is an important component of southern bottomland hardwood forests, widespread mortality could significantly alter forest composition and create longer-term ecological consequences.

The episode also examines management options. Individual high-value ash trees can sometimes be protected through systemic insecticide treatments, but treating large numbers of trees is costly and generally impractical at the forest scale. We also discuss the economic consequences of losing ash, including impacts on timber value and industries that have historically relied on ash for products such as furniture, flooring, baseball bats, and musical instruments.

This episode is a useful listen for forest landowners, consulting foresters, forest health professionals, forestry students, Extension professionals, and anyone interested in invasive species, bottomland hardwood management, and the future of ash in southern forests.

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