Black soot on rhodendrons, pirrus and azalea

We have a thick black covering on nearly all of our rhodendrons, pirrus and azalea – and we have a large woodland garden so it is a physically huge problem.

I cannot possibly wash all the plants, it would take me years!!

I need a spray to treat the pests that are causing this problem, but i need a lot of it. Could you advise me what to do please.

Many thanks,
Karen Morgan

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1 Comment To "Black soot on rhodendrons, pirrus and azalea"

#1 Comment By Downtoearthdigs On 04/02/2019 @ 6:05 am

This can be difficult, as there could be multiple pests. My best recommendation would be to apply a broad spectrum pesticide. This can be something as simple as a garlic spray, rosemary oil, or pepper extract. This collection of articles will help you to craft your own pesticides, among other organic gardening tips: https://www.gardeningknowhow.com/special/organic/ ^[1]

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