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Ash Rust Treatment

Ash Rust is a rare occurrence in Philadelphia but it’s cause for serious concern when it erupts. Already plagued by health problems including the fatal Emerald Ash Borer, Ash Rust stresses Ash Trees and can further erode tree health.

Ash Rust infects White, Green and sometimes Black Ash. Symptoms start as small yellow to yellow-orange spots on leaves beginning in Mid-May. Wart like-swellings may also erupt and leaves often become distorted. By July, heavily infected Ash trees may have significant leaf loss.

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Preventative treatment is the best control but is not recommended since the disease only occurs sporadically. Giroud Tree and Lawn recommends the following tree service actions:

  1. Schedule Ash Tree Inspection Now: Have an ISA Certified Arborist evaluate overall health of the tree and determine the best actions to protect tree health.
  2. Reduce Tree Stress: In the fall, deep root fertilization, soil amendments, vitamins and nutrients can help to boost the tree’s immune system
  3. Order Emerald Ash Borer Treatment: A fatal pest, treatment is the only way to protect Ash Trees from Emerald Ash Borer. If the Ash Tree is valuable to the landscape, Emerald Ash Borer treatment is critical.
  4. Regular Monitoring: Because Ash Trees face formidable health issue, it is important to have professional inspections regularly to catch emerging issues early.

Watch video of Ash Tree infected with Ash Rust:

Like most Rust diseases, Ash Rust requires a second host. In this case, the fungal spores spend the winter on marsh and cord grass along the coast. An unusual confluence of conditions is required for the spores to travel as far as the Philadelphia area. With Ash trees already plagued under attack from serious health issues like Emerald Ash Borer, a professional tree inspection is the most important first step a homeowner can take to protect the health of Ash trees.

If you see signs of Ash Rust on your trees, contact Giroud. Your Giroud Arborist will check your trees and recommend the best action. Schedule a free evaluation now.

Ash Rust is one of many problems affecting trees. Learn more at Giroud’s insect and disease control page.