Mildew on hybiscus?
Hello, My perennial hybiscus which we planted this year was doing great but then suddenly the leaves are turning yellow and falling off. It's has slowed it's blooming. I sprayed it with a Bayer 3 in 1 product and now I'm seeing a white film on the leaves. Is this leftover fungicide or is this mildew? How should I treat it? I have some Captan would that be effective?
Ingham County Michigan
There are many different reasons as to why your hibiscus leaves are turning yellow and beginning to fall off. It may be affected by temperature, light, location, pests, watering issues, and nutrient deficiencies which can all cause the leaves to turn yellow
I would make sure your soil is healthy, and the growing environment is adequate for the hydrangea. It appears that you may have left over fungicide on the leaves.
Listed below are links that will guide you to determine the reasoning for the yellowing of the leaves, and healthy practices for growing.