The Garden Community for Garden Lovers

By Davidz

United Kingdom Gb

Our rhododendrum leaves have a dirty sticky substance on them. What is it and how do we clean them and stop it spreading?



Possibly aphids on your rhododendron leaves, wash with agricultural soap and look for evidence of aphids.

25 Mar, 2012


Thank you. I think we've got a big problem now. The dirty mold is everywhere. We've just noticed it on our camellia bush, and we have a big garden! I think we will need to apply a spray. There's too much to just wash.

25 Mar, 2012


Sorry 'wash' meant spray! Also DAvid do a Google search on aphid residue to see if it really matches. Where are you in the UK?

25 Mar, 2012


Yes, I've googled photos of dirty mold from aphids, and it's the same. We're in Halebarns, Cheshire

25 Mar, 2012


On with the spray!

25 Mar, 2012


Alternatively, check out for a biological control

25 Mar, 2012

How do I say thanks?

Answer question


Not found an answer?