Q: Last year I learned I had rust on my serviceberry and hawthorn trees. What do I look for this year to prevent that? A: It’s hard to prevent rust infections on vulnerable plants unless you are ...

Q: I heard rust fungus can infect junipers but that they aren’t worth spraying to treat. Is there anything else I can do to reduce the fungal spread from them to my other trees? A: If you see and can ...

While wandering middle Alaska this summer, I noticed orange spruce trees along the entire length of the Denali Highway, from Paxson to Cantwell. In what looked like a dendrological case of frostbite, ...

A: By the looks of the photos you sent in, your serviceberries have a case of rust. Your serviceberries, also called juneberries or saskatoons, should be beautifully bluish-purple and plump right now.

Question: You recommended a fungicide for an orange rust control on plumeria. The rust fungus seems like a natural occurrence, especially as the leaves decline in the fall. I have developed the ...

Monosson is the author of Blight: Fungi and the Coming Pandemic. She is an adjunct faculty member at the University of Massachusetts Amherst There are many reasons to fear a new fungal pathogen—from ...