I have a white fungus on our lilac tree. What can I use to treat it?

Assuming it is powdery mildew, a common fungal disease of lilacs, the best way to control it is with preventative spraying with copper of sulfur fungicide before the symptoms show…around mid-May through mid-June.  It is difficult to control once the white powdery coating on the leaves shows up.  I you had it this year, spray preventatively next year.

Get a quote

If you want to get a free consultation without any obligations, fill in the form below and we'll get in touch with you.