My Rhoddies have a rust colored powder on the leaves and recently have begun developing large black spots on some of the lower leaves. We've been spraying them with a general fungicide recommended by our nursery, but that doesn't seem to be helping. I live the pacific northwest. We have been watering them daily. Any advice?
What is wrong with my rhododendrons and how do I fix it?
Fungus a lot of times is caused by poor air circulation.Rhododendrons prefer shade,so they stay damp.
If the fungicides your using arent working.I would suggest you hard prune them,and burn the infected leaves.and start anew next year.
Reply:Stop watering them every day. If they are older, established rhodo's they do not need to be watered, unless there is a drought.
I would also recommend pruning your plants to allow more air flow, which will help decrease the conditions needed by the rust.
That should help.
Reply:im in oregon,,,back off on everyday watering,,,also not full sun tolerant,,,,last but not least get some rhody and azelea food.
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