Cancel anytime. A lilac with pseudocercospora Q • My 30-year-old lilacs are getting lots of brown spots on their leaves, and some of the leaves are falling off. The same thing happened last year.

The problem we’re seeing is Leaf Spot, a fungus that starts off as brown spots on the leaves and ... However, if your lilac is infected for several years in a row it may suffer.

Why does my plant have brown spots on the leaves? Are your houseplants developing brown spots on the plant leaves?

Symptoms often begin as expanding leaf spots. On lilac and viburnum, small spots expand to irregularly shaped brown lesions with yellow halos (Fig. 1). For most other hosts (cherry, pear, basswood, ...