Hawthorne tree ? - Ask Extension
Although the leaves and this hawthorn tree itself both appear healthy, many of the fruits have this rusty-appearing covering this year. Is this norma...
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Hawthorne tree ? #804296
Asked August 02, 2022, 3:49 PM EDT
Although the leaves and this hawthorn tree itself both appear healthy, many of the fruits have this rusty-appearing covering this year. Is this normal or a disease of some sort ?
Hennepin County Minnesota
Expert Response
Your hawthorn has cedar-quince rust. The finger-like structures on the fruit are fungal spores called aecia. These require two hosts: a cedar or juniper and a member of the rose family, in your case the hawthorn. They usually do not cause severe damage, and resistant varieties of these plants are available.
The attached links provide information about how to prevent and treat this condition.
https://hortnews.extension.iastate.edu/2005/8-10/rusts.ht
https://extension.psu.edu/hawthorn-diseases
The attached links provide information about how to prevent and treat this condition.
https://hortnews.extension.iastate.edu/2005/8-10/rusts.ht
https://extension.psu.edu/hawthorn-diseases
