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Mildew on my Amelanchier Canadensis

sabeehasabeeha Posts: 344
edited September 2018 in Problem solving
Hello,

I recently cleared out a bed full of mildew infested asters - there is an Amelanchier planted there, which doesn't seem to be doing very well (lots of brown leaves), and I was looking at it again closely today and I believe it has mildew as well! (which I didn't notice before).

Ive cleared the area anyway, and I will try to keep on top of watering it (it seems weird to water a tree?) will this be sufficient to improve it? Or should I try to get something to treat it? (any recommendations welcome - I read the RHS article on this, which had a few suggestions, but would love to hear personal recommendations or suggestions)

The leaves don't seem to have mildew, they are just brown; it is the trunk and all the stems which seem to be affected.

Thank you.




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  • hogweedhogweed Posts: 4,053
    Powdery mildew affects some plants when it is very dry. Not sure if it can affect trees. Your tree seems to have suffered with lack of water. If you are not under rain now I would give it a couple of gallons every week. If it has an established trunk, I would just brush it with water to get the powder off it. And keep your fingers crossed its not a goner.
    'Optimism is the faith that leads to achievement' - Helen Keller
  • Hi @sabeeha,

    Amelanchiers are thirsty trees so plenty of water as @hogweed has suggested might save it. If it has gone short of water you might get an earlier than usual leaf fall this year.

    I occasionally get powdery mildew on some herbaceous plants which are under a large oak tree. I've sprayed with a solution of 5g bicarbonate of soda in 1 L water with a few drops of washing up liquid. Seems to do the trick.
    You could try washing the main trunk and any branches you can reach .... wouldn't do any harm.

    Good luck,
    Bee x
    Gardener and beekeeper in beautiful Scottish Borders  

    A single bee creates just one twelfth of a teaspoon of honey in her lifetime
  • nutcutletnutcutlet Posts: 27,445
    the leaves will drop soon and there'll be fresh new ones next year


    In the sticks near Peterborough
  • sabeehasabeeha Posts: 344
    Thank you for the replies!

    Hogweed thank you! I will increase how much water I give it.  I will see if I can get a photo of the trunk, perhaps I have made a mistake.

    I don't know how old it is, and I dont know that much about trees, but it is certainly not too young, maybe five years old? The trunk is narrow, and there is a cane that is staked in alongside vertically.  But I will try to brush whatever is on the trunk off.

    Bee witched Thank you, I will try your suggestion! There were loads of scary sounding chemical suggestions I had been reading while looking into it, which I was hesitant to try (having no experience with them).

    It has been like this since the beginning of August (brown leaves) when the weather had been hot for ages.

    nutcutlet I can see new leaf buds forming on the end of the branches but it upsets me seeing the rest of the tree like that! On top of that it seems to be leaning which makes it look even more despondent!!!
  • Hi @sabeeha  :)  can you show us a photo or two of your amelanchier?

    Gardening in Central Norfolk on improved gritty moraine over chalk ... free-draining.





  • sabeehasabeeha Posts: 344
    Hi @sabeeha  :)  can you show us a photo or two of your amelanchier?
    Yes, good idea! Should have done this initially!

    The entire tree



    Part of the trunk



    Some of the leaves




  • I wouldn't worry about that  :)   I think the mildew is probably just 'surface ' from the asters etc that were around it.  It does look as if it got a bit dry ... but most things did.

    It's a relatively recently planted tree so I'd give it a couple of buckets of water to make sure that the roots are getting plenty.  The browning of the leaves shows it was a bit unhappy in the drought but I don't think it was enough to cause a permanent problem.  I've just popped out to have a look at my Amelanchier which is a bit bigger than yours (and a multi-stemmed version) ... the leaves are just beginning to change colour.  Don't expect yours will be long either.  

    If we get another dry spell next spring/summer two buckets full of water twice or three times a week should keep it happy and healthy  :)

    Gardening in Central Norfolk on improved gritty moraine over chalk ... free-draining.





  • sabeehasabeeha Posts: 344
    Thank you so much! That is very reassuring! I kept on looking at the photos of the trunk and the problem was getting bigger and bigger in my head  :/

    The previous owners probably didn't water it much in the weeks upto moving (it was very very hot) things probably too hectic - but am happy to hear its a temporary thing

    Thank you again :)
  • I think the leaves would be looking much worse than they do if there was a fundamental problem with the trunk and branches   :)

    Gardening in Central Norfolk on improved gritty moraine over chalk ... free-draining.





  • The light patches on the trunk look more like lichen than mildew.  Lichens can provide a lovely 'patina' to trees and are harmless so I'm sure you don't have anything to worry about with that tree. :)
    A trowel in the hand is worth a thousand lost under a bush.
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