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in Problem solving
morning all !! I have a forest flame quite large bush , been very healthy for years !! Over the last few months the leaves have gone black and also some have white spots on the underneath the leaf !! The black stuff is falling on my stone path and discolouring that as well !! Can anyone help ???
There's probably been some aphids on there, and sooty mould is growing on the honeydew left by them. It should wash off if you hose them down gently, getting the underside of the leaves as well as the top surface.
Well thank you what causes this ??
It won't wash down just tried !! Anyone else got any advice ??
You need to add a little fairy liquid to warm water. Gently though so ss not to damage the leaves. A systemic spray in few weks will help prevent this for next year
I too have this sooty mould on my Pieris, I did manage to get some of it off with a damp sponge but my plants are so big I couldn't possibly wipe down all the leaves. Verdon, may I ask what you mean by a systemic spray in a few weeks time?
I would apply a systemic insectide soon...to control the aphids that caused your sooty mould.
you can use a soap...organic...spray during the growing season to control aphids to ensure a clean bush next year
Still have sooty mould on two of my old large Pieris, now seems to be spreading on to 2 of my younger ones gave it a spray of Roseclear a couple of days ago. How long does it take to show signs of improvement? Thanks
Not sure Meomye as I don't use insecticides, but I'd think they act quite quickly -within a week perhaps. I'd be inclined to remove some of the affected foliage and dispose of it - not in the compost bin though, if you have one. Plants under stress are more likely to succumb to pests and diseases. Are your shrubs in soil that's in good condition, and not too dry or too soggy, with good airflow?
I'm sure someone will be able to offer further advice re the spray though.
Use bicarbonate of soda in water with a few drops of washing up liquid in, Then spray every 4-5 days. It will help wash off the sooty mould and prevent any powdery mildew forming.
Thanks Fairygirl, I neglected to mention all of my Pieris are in pots.
Edd, how much bicarb to a litre spray gun please?
I use a spray with one litre of water with 2 asprin tablets crushed into it and/or one tea spoon of Bicarbonate of soda. It works for me.