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Wilting Spotted Aucuba or Laurel

Discussion in 'Pests, Diseases and Cures' started by Steven Grieve, Jul 30, 2021.

  1. Steven Grieve

    Steven Grieve Apprentice Gardener

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    Afternoon.

    My first post.

    My "laurel" plants are dying. I've already lost 3, where the leaves got diseased and blackened and the stems too, then the plant was dead.

    Now the lower leaves are turning yellow and falling off.

    They are about 4 feet tall with bright red berries, and have been growing against a slatted fence in partial shade fine n dandy since I bought them for £6 each as new, wee plants.
    A previous question on another forum said the solution was now illegal, and that the potash in tomato feed is my only chance.
    I've tried that, and it may have slowed it down, but I cant be pouring that on for the next 30 years.

    I'll try n n add pics.

    Cheers.

    Steve
     

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  2. pete

    pete Growing a bit of this and a bit of that....

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    It looks possibly fungal to me.
    Cant see where potash comes into it?

    Also found something about waterlogging?

    Aucuba blackening
     
  3. Steven Grieve

    Steven Grieve Apprentice Gardener

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    Thank you Pete.

    The last fella on another website said fungal too, but that the definite solution had been banned, so tomato feed's potash was his suggestion.

    We've had a dry Summer up here in Dundee, except for Tuesdays monsoon.

    Just a shame that a real sturdy plant is dying away in my garden, just where I wanted a sturdy hedge, when it survives robustly everywhere else..
     
  4. pete

    pete Growing a bit of this and a bit of that....

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    I could be wrong, but I've never heard of a potash feed being a cure for a fungal infection, having said that, I honestly dont know what the problem is.
    You could try a fungicide , maybe one of the rose sprays perhaps, I know a lot of the really good ones have now been banned.

    You say its been dry, have you tried watering?

    I assume they are well established plants?
     
  5. JWK

    JWK Gardener Staff Member

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    My established Acuba has taken a beating this year too, the warm weather in early spring encouraged growth and subsequent frosts crisped up much of the leaves. I just wonder if your weather has been that bit colder than us in the south. Once a plant becomes weakened they are susceptible to fungal attacks.

    I wonder how hardy Acuba is, have you seen others growing in neighbours garden Steve?
     
  6. JWK

    JWK Gardener Staff Member

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    Just checked its hardiness on the rhs site, -10 to -15 which we rarely get as low as. But we are on an exposed hillside so taking wind chill into account I reckon that is why my specimen does not thrive. I see some really healthy ones in gardens around here in sheltered positions.
     
  7. Steven Grieve

    Steven Grieve Apprentice Gardener

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    Thank you chaps.

    "I just wonder if your weather has been that bit colder than us in the South."

    Beautifully put.

    I'll try n get some fungicide n see what that does.
    Here are some pics to give you maybe a better idea.
    Its hardly exposed, on the North side of the fence.
    The gaps left n right are where the others died.

    I pruned back some great growth a month or so ago that was coming outwards, to keep it hedge like.

    Cheers
     

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    • JWK

      JWK Gardener Staff Member

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      The remaining ones look good , it's worth a try with a rose fungicide as pete suggests. Spray the underside of the leaves so the chemical gets absorbed that's where the little stoma (openings) are. This is more important on plants with leathery leaves otherwise the spray just runs off the upper surface like a duck's back.
       
    • pete

      pete Growing a bit of this and a bit of that....

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      From the pictures all I can see is old leaves dying, but the new growth looks fine.
       
    • Steven Grieve

      Steven Grieve Apprentice Gardener

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      I've sprayed on some rose fungicide stuff so we'll see.


      Cheers all.

      If they die, I'll blame you....
       
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      • Steven Grieve

        Steven Grieve Apprentice Gardener

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        While you are all here...

        The pics down the garden are looking to the sunny and slightly warmer South...

        The pyracantha to the right is 4 plants pruned to form another hedge.

        Next to that is a purple beech 'hedge.

        Would be great one day to lose the fence n have my natural border.

        The pyracantha has great growth on top, but the North n South sides ain't great, as I guess with the fence, neither get direct sunlight.

        If I sawed a section of fence out between the fence posts, which coincidentally matches up with the hedge, would the increased sunlight give that side a surge of new growth ?

        I'd screw back the fence panel in Winter for security, then take it down again in the Spring, hoping it would really thicken up, then I'd just bin the fence panel.


        Answers on a postcard

        01 811 8055
         
      • Steven Grieve

        Steven Grieve Apprentice Gardener

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        Swap Shop reference there....

        I've scooshed on some rose plant fungicide stuff as well as I can.

        The healthy leaves will soon be outnumbered by yellowing leaves, then my plants will be past the point of no return, with no new buds on the main stalks to replace the fallen ones.
         
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