USA NPN National Phenology Network

Taking the Pulse of Our Planet

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An invasive pest, emerald ash borer has killed millions of ash trees in the United States.

Image credit:
David Cappaert, Bugwood.org

Emerald Ash Borer Forecast

Emerald ash borer is a beetle that causes significant harm to ash trees throughout the eastern United States. 


Emerald Ash Borer Current Day Forecast.


Emerald Ash Borer 6-Day Forecast.

Pheno Forecast maps show when management actions should be taken for key pest species. These maps are updated daily and are available 6 days in the future.

Pheno forecasts are based on published growing degree day (GDD) thresholds for points in pest life cycles when management actions are most effective. Forecasts are currently available for five insect pest species.  

Help us improve these maps! Our Pheno Forecast map products are still in development, and we seek input on their performance in your area. Give your feedback on the sidebar on the right side of this page.

Species Background

Emerald Ash Borer (Agrilus planipennis) is an invasive beetle from Asia which has spread across the eastern United States since 2002. In their larval stage, the beetles destroy the heartwood of ash trees, killing them within a few years. The pest is responsible for the death of hundreds of millions of ash trees.

Treatment Summary

EAB larvae, Photo:Pennsylvania Department of Conservation and Natural Resources - Forestry, Bugwood.org

For specific information on preferred treatment options in your region, we recommend contacting your local extension agent. The forecast above is a real-time, high-resolution forecast which estimates the appropriate time to control for adult beetles on infested trees, to reduce the spread of the pest. The treatment window begins when adults first emerge at 450-550 GDDs and continues through peak abundance at 550- 1,000 GDDs. Adults lay eggs approximately 14 days after emergence, so treatment is critical in this window. GDDs are accumulated from a base temperature of 50oF.

Source: Herms et al 2014

More information on map development and re-use policy.

Treatment Guidance

Insecticide Options for Protecting Ash Trees from Emerald Ash Borer 

Emerald Ash Borer Information Network

Explore EAB Forecast