Yucca Powdery Mildew: Lysol Spray Treatment

White Powder on Yuccas? It's Powdery Mildew

Cat's large yucca and three smaller ones show yellowing and a white powdery coating. She asks for identification and treatment.

Expert Solution: Daily Lysol Spray Regimen

Darlene confirms powdery mildew. Treatment: spray daily with Lysol (or generic) for a week, covering all leaf surfaces top and bottom. Then every other day for a week, then twice weekly for two weeks. Monitor and resume if it returns. Prevention: avoid overwatering, add a fan for air circulation.