Areca Palms Are Dying of Some White Powdery Disease
My plants are dying. The roots are drying. Curry patta plant started with white powdery substance all over stems and twigs. And then I cut the entire thing; now even other plants are getting same problem and dying.
Certified GKH Gardening Expert
Your problem is powdery mildew, which is a fungus. Here is an article or two that you may find helpful: https://www.gardeningknowhow.com/ornamental/flowers/hibiscus/answers-to-what-causes-hibiscus-leaves-turning-yellow.htm