Home > Question >

What is causing black mould on the leaves of my Rhododendron?

Our Advice:

This is probably either mealy bug or scale insect. They feed and excrete “honeydew” onto the leaves, where this sooty mould grows on it. To control these pests, spray with Bug Clear Ultra from Scott's or Resolva Bug Killer from Westland. Once you have dealt with the cause of the sooty mould, it should gradually disappear.

Here are some related questions:

Not what you are looking for?

If you can't find what you are looking for on the website then you can ask one of our experts. To get in touch with us Click Here

We will try to get back to you with an answer as soon as we can.

Here is some more information for you:

Did you find this answer useful? Subscribe to our newsletter for gardeing news, projects, special offers and competitions.

Ask another gardening question:

Learn More About Pests and Diseases

Gardening Projects for September

---

How to plant through weed-suppressing membrane

How to make the most of your dahlias

How to: Maintenance Pruning

How to Propagate Lilies from Bulbils

Latest Gardening Videos

---

Planting a Spring Flowering Container

How do I protect my grapes from insects?

Growing Nasturtiums

How can I get rid of a red ant nest in my lawn?

Cultivating Melons

Moving House and Taking the Garden with You | Garden Ideas | Val Bradley

All Videos

Explore Gardens from Around the World

Keukenhof
Lisse, Netherlands

Butchart Gardens
British Columbia, Canada

Monet's Garden, Giverny
Giverny, France

Vallarta Botanical Garden
Vallarta, Mexico

Dubai Miracle Garden
Dubai, United Arab Emirates

Lalbagh Botanical Garden
Bangalore, India