rhizosphaera

Hello: I'm searching for a natural treatment for Rhizosphaera on Colorado Blue Spruce trees. Yes, I'm aware of chlorothalonil, copper hydroxide or mancozeb, but I'm looking for something less toxic. Would Neem Oil be a possibility? I'm also trying to control bagworms on those trees. I found a...

Last year at this time I planted 4 Colorado Spruce trees. Within the past 9 months one of them has steadily lost needles from the bottom up. I took a sample in to the local nursery where they looked under a microscope to find fungus. I don’t know for sure but I suspect Rhizosphaera. Shortly...