Cedar-apple rust is one of several plant diseases that are all caused by different species of a fungus called gymnosporangium. All of these diseases are referred to as gymnosporangium rust diseases.

The leaves of my apple tree have odd spots on them. What is this and what can I do about it? Although there are other possibilities, cedar-apple rust is a possibility, given your description, the wet ...

Dear Neil: What would be causing the slow death of our dwarf gardenias? These green leaves on the left and yellowed leaves on the right are both on the same plant. We have two other plants on either ...

Question: There are two large Juniper trees in my front yard with an orange gelatinous structure with tentacles on it. They look like they are from outer space. What are they and how do I get rid of ...

You could be dealing with a potentially devastating fungus known as Pacific coast pear rust. “On cedar trees, it looks like someone threw orange marmalade all over the tree,” said Jay Pscheidt, plant ...