Downy mildew

groundbeetle · Jun 24, 2022

NigelJ said: ↑
Having had a quick read up in my favourite pest and disease book, there are lots of both of these. Downy mildews are favoured by damp conditions and the general recommendation is to remove and destroy (burn) affected plants and improve ventilation. Two notorious examples being Aquilegia downy mildew and Impatiens downy mildew.
Powdery mildews are favoured by dry, hot conditions, so more of a problem when plants are stressed. Advice is to clear up affected plants and debris at the end of the season and either burn or compost. Try and keep plants growing and evenly watered.
As for treatment: for Downy mildews there is little available to gardeners; for Powdery mildew sulphur can help as can systemic fungicides, I've also seen recommendations for spraying with diluted milk.
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I think it must be powdery mildew that I get on Violas in one part of the garden. So far the Violas in another area have been ok, fingers crossed, but I want to be one step ahead of it and try to understand how to deal with it. I think it is the part of the garden that gets most sun where they are affected, and we have had a few very hot days recently.

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Downy mildew

groundbeetle Gardener

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Downy mildew

groundbeetle Gardener

Impatiens--Downy Mildew

Impatiens downy mildew - curses!

Indoor Grapevine - Best Antifungal/Mildew Care?

Indoor Grapevine Fungal / Mildew Care?

Powdery mildew on apple tree?

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