![](http://extension.udel.edu/ornamentals/files/2017/05/Ash-Rust-2014-annotated-300x212.jpg)
Ash Rust on leaves and petioles. Photo credit: N. Gregory
![](http://extension.udel.edu/ornamentals/files/2017/05/Whitney-Cranshaw-Colorado-State-University-Lilac-Ash-borer-adults-300x200.jpg)
Lilac Ash borer adults. Photo credit: Whitney
Cranshaw, Colorado State University
![](http://extension.udel.edu/ornamentals/files/2017/05/Whitney-Cranshaw-Colorado-State-University-Lilace-Ash-borer-pupal-skin-192x300.jpg)
Lilac Ash borer pupal skin. Photo credit: Whitney Cranshaw, Colorado State University
![](http://extension.udel.edu/ornamentals/files/2017/05/Debbie-Miller-USDA-Forest-Service-ash-borer-adult-300x199.jpg)
Emerald Ash borer adult. Photo credit: Debbie Miller, USDA Forest Service