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Rhododendron leaf spot

Symptoms

A fungal attack causes an outbreak of spots on the leaves. The dark marks are often surrounded by a pinkish-purple ring.

Find it on: rhododendrons, azaleas
Time to act: spring, summer, autumn, winter

Overview

This fungal problem results in rounded spots on the leaves. Although it's unsightly, leaf spot is only a significant problem on poorly growing or unhealthy plants, which might end up dropping a substantial number of leaves.


Solution

A fungal attack causes an outbreak of spots on the leaves. The dark marks are often surrounded by a pinkish-purple ring.

Organic

Promptly remove and destroy all infected leaves, both on the plant and on the ground. Don't put them on the compost heap. Also improve the growing conditions - add a mulch of well-rotted compost, and regularly feed and water. Keep deadheading.




Discuss this problem

Talkback: Rhododendron leaf spot
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nimrod 24/11/2011 at 15:27

Which are the best outdoor tomatos to grow

Regards Nimrod

Gill M 08/05/2012 at 19:14

within 2 days the leaves of my 2 very large plants have turned black,shrivelled and drooped. They have been healthy for the past 12-15 years.  The leaves are that shrivelled they look dead. Any ideas what this may be.

MJ2 20/05/2013 at 17:44

I have a very old victorian rhododendron garden which now appears to have a few trees that are spotted and are looking in general poor condition what should I do and can I treat rather than remove these trees as some are over 100 years old and I do not want to damage the appearance of the garden. Please advise.

Patsey 17/04/2015 at 18:54

Please tell me what is the cause and what is the cure, thank you

Verdun 17/04/2015 at 19:17

But fragmented this thread.  

Patsey, what sort of leaf spot do you have?  Are leaves shrivelling and curling like cigars and dropping?  

are your plants in pots?  Is compost very wet? 

Bear in mind right now many plants have leaf spots and markings.  Chilly nights, hot sun all sorts of physiological reasons that often resolve themselves as season progresses