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Emerald Ash Borer In Pennsylvania: A Threat To Ash Trees

Central Pennsylvania Forestry Some Good News About Emerald Ash Borer
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The emerald ash borer (EAB) is an invasive insect species that has been causing significant damage to ash trees in Pennsylvania. Since its arrival in the state, the EAB has spread rapidly, impacting both urban and forested areas. This article aims to provide an overview of the emerald ash borer situation in Pennsylvania and offer insights into how to identify and manage this destructive pest.


The emerald ash borer is a small, metallic green beetle that measures around half an inch in length. The adult beetles have distinct bullet-shaped bodies and can be observed from late spring to early summer. However, it is the larvae that cause the most damage. These cream-colored grubs feed on the inner bark of ash trees, disrupting the tree’s ability to transport water and nutrients.

Spread and Impact

The emerald ash borer is believed to have been introduced to Pennsylvania through the transport of infested firewood or nursery stock. Once established, the insect can spread quickly, aided by natural means such as wind and human activities like the movement of infested wood materials. The EAB has the potential to kill ash trees within 3-5 years of infestation, resulting in significant economic and ecological losses.

Signs of Infestation

One of the earliest signs of emerald ash borer infestation is canopy dieback. Ash trees affected by the EAB exhibit thinning foliage and branches that may start to die from the top down. Other signs include D-shaped exit holes on the tree trunk, S-shaped larval galleries beneath the bark, and increased woodpecker activity as they feed on the larvae.

Management Strategies

Several management strategies can be employed to mitigate the impact of the emerald ash borer in Pennsylvania. One option is to treat ash trees with insecticides that specifically target the EAB. These treatments need to be applied regularly to protect the trees effectively. Another approach is the removal and replacement of infested ash trees with species that are not susceptible to the emerald ash borer.

Regulations and Recommendations

Pennsylvania has implemented regulations to prevent the spread of the emerald ash borer. These regulations restrict the movement of ash materials, such as firewood, outside of quarantined areas. It is essential for residents and businesses to comply with these regulations to minimize the risk of inadvertently spreading the pest.

Public Awareness and Reporting

Public awareness plays a crucial role in managing the emerald ash borer. Educating communities about the signs of infestation and the importance of early detection can help prevent the spread of the insect. Additionally, reporting any suspected EAB sightings to the local authorities or the Pennsylvania Department of Agriculture can aid in tracking the pest’s distribution and implementing control measures.


The emerald ash borer poses a significant threat to ash trees in Pennsylvania. It is crucial for residents, businesses, and authorities to work together to manage and control the spread of this invasive insect. By implementing effective management strategies, raising public awareness, and adhering to regulations, we can protect Pennsylvania’s ash trees and preserve the state’s natural beauty and ecological balance.