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fire blight #871001

Asked May 31, 2024, 5:29 PM EDT

I have just discovered Fire Blight in my small orchard of apple trees. I removed the infected trees. I know about cutting away wood, but I need something to protect my remaining trees right now. What fungicide or other chemical can I use on my remaining healthy trees now? Thank you

Clackamas County Oregon

Expert Response

Fire blight is common east of the Cascades but far less common on this side of the Cascades. It is most commonly found on this side in Asian pears.   With apples, some rootstocks are very resistant, others, not. Also, some apple varieties are more susceptible. Often, the problem is at the base of the trunk with little to no limb and twig symptoms. Also, it needs a unique combination of temperatures above 65 degrees F and high humidity for at least 24 hours. 

What are the symptoms you are seeing? 

Here is a link to a discussion of the disease: 

https://pnwhandbooks.org/plantdisease/host-disease/apple-malus-spp-fire-blight 

Chip Bubl, OSU Extension Agent/Columbia County (retired) <personal data hidden>
An Ask Extension Expert Replied June 04, 2024, 1:32 PM EDT

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