Hi, I planted two apple ... #143849 - Ask Extension

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Hi, I planted two apple ... #143849

Asked July 29, 2013, 11:15 AM EDT

Hi, I planted two apple trees this spring, and a fungus has appeared on them. Can you identify it and tell me how I can possibly treat it? Thanks so much!

Washington County Maryland

Expert Response

Thank you for your question.  Your apple trees have cedar-apple rust.  This is a plant disease caused by a fungus that spends part of its life on juniper/red cedar trees and part of it on apples and their other members of the apple family.  Cedar-apple rust can't be cured on the current season's apples or leaves.  Fungicides don't cure, they only prevent.  So plan now to spray with a preventive fungicide like copper or sulfur next spring when the buds turn pink, when most of the petals have fallen and again 10 days later.  This link will tell you more about rust diseases.  I hope this is helpful.
http://plantdiagnostics.umd.edu/level3.cfm?causeID=1195
Annette Cormany Replied July 30, 2013, 8:46 AM EDT
Ok. Thanks so much for your help!
The Question Asker Replied July 30, 2013, 9:03 AM EDT
You are most welcome.  I'm glad I could help.
Annette Cormany Replied August 06, 2013, 9:04 AM EDT

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