Forum home Problem solving

Heuchera disease: which one?

Papi JoPapi Jo Brittany, France Posts: 3,703
The most vigorous of my heucheras, H. 'Chocolate Ruffles' are still vigorous this season, except that upon looking closely for a few days I see worrying signs on the foliage. For now I have just deleted all the affected leaves, but it continues and I hope I will not have to tear everything away.
For the moment none of my other varieties of heucheras are concerned.
On the internet, there are several mentions of diseases of the heucheras: "The heucheras fear rot in soil that is too humid, the adult vine weevil perforate the foliage while their larvae attack the roots." OK, I've already had vine weevil attacks, but this is not the case.
Rust is also mentioned for heucheras here:
but the images do not seem to match, I do not have pustules, but areas that make me think of a virus (mosaic type).
I do not think it is burns (sun or frost) either.
Have you ever noticed this problem on your heucheras? Can some one identify the disease? and a treatment?
You are invited to a virtual visit of my garden (in English or in French).

Posts

  • nultyphilip224nultyphilip224 Ireland,..The Midlands.Posts: 923
    @Papi Jo ,..looks like something moist was dropped on the foliage and the sun then scorched it,..as you say a few diseases have cropped up with Heuchera's and Heucherella's,..so far i have not had any signs of disease,..nor i might add on my Hollyhocks,..the latter i am testing with a Neem Oil Mix.

    I spray all my Heuchera Plants and all my other plants,..nothing amiss.

    The mix has so far prevented all known mites and insects that eat foliage in my own garden,..the advantage is that its a Natural Oil,..Organic,..have a read in the link below,..it might well be the answer to helping you stem the disease if it be one,..either way it will be of use in the garden anyway.

    https://www.thespruce.com/using-neem-oil-as-an-organic-insecticide-2132579

  • Papi JoPapi Jo Brittany, France Posts: 3,703
    Thanks for that tip, @nultyphilip224. However, I'd rather identify the exact nature of the problem before applying any solution.
    Currently I am just removing the affected leaves and watching for any development. I'll post any further developments in this discussion.
    You are invited to a virtual visit of my garden (in English or in French).
  • Papi JoPapi Jo Brittany, France Posts: 3,703
    It's happened again! Same cultivar, Heuchera x 'Chocolate Ruffles'. Some pics taken this morning.
    Diseased leaf - close-up
    Front: normal leaf on the left / diseased leaf on the right
    Reverse: normal leaf on the left / diseased leaf on the right

    Diseased leaf seen in contre-jour
    You are invited to a virtual visit of my garden (in English or in French).
  • Papi JoPapi Jo Brittany, France Posts: 3,703
    Thanks for the reference, @AnniD .
    You are invited to a virtual visit of my garden (in English or in French).
  • I am the IPM manager at a large nursery that produces a large amount of Heuchera and I have yet to send that particular problem to the provincial diagnostics lab for proper identification but I have seen it. As Heuchera tends to be a shade loving plant I have treated it as abiotic, likely sunscorch. To be certain, it is unlikely fungal as the pattern of "infection" does not cross the veins for the most part. So if it is pathenogenic, it would likely be bacterial or viral. In either case the only true solution is removing the affected leaves.
  • Papi JoPapi Jo Brittany, France Posts: 3,703
    Thanks for your message, @jameshtracey
    I do know that Heuchera do not like the sun in general (depending on the cultivar). As you and others have said it could be sun-scorch. Anyway, the problem does not seem to spread and removing the affected leaves is the solution I have used last year (and will do this time too).
    You are invited to a virtual visit of my garden (in English or in French).
Sign In or Register to comment.