Failing Yellow Magnolia: Powdery Mildew or Verticillium Wilt?

2-year-old 'Butterflies' magnolia declining: leafless in August, weak bloom, dead branches, white powdery spots and yellow-green lichen-like growth on bark. Owner asks if powdery mildew kills branches.

Possibilities

• Powdery mildew: Can kill young trees if severe. Treat with fungicides (dinocap, myclobutanil, sulfur, etc.).
• Verticillium wilt: Root fungus with similar symptoms—little cure.
• Planting issues: Burlap left on, hole too small, root binding.

Steps

1. Check nursery for warranty/advice.
2. Call local Extension for horticulture specialist visit.
3. Verticillium info: OSU Fact Sheet.

Root diseases are hard to reverse; environmental factors often primary.