Brown spots, yellow leaves on willow
I have a recently (about 3 months ago) planted curly willow that has a handful of leaves with brown spots, which then turn yellow. The tree has grown quite a bit and has a lot of healthy growth but if this is a problem I want to tackle it sooner rather than later.
Cass County Missouri
It looks like it just has some fungal leaf spots, probably caused from all of the recent rains we have had. Use a fungicide containing chlorothalonil to control it and keep it from spreading. Daconil is a common brand containing chlorothalonil.