Thuja decline

Discussion in 'Gymnosperms (incl. Conifers)' started by Puddleton, Jul 11, 2020.

  1. Puddleton

    Puddleton Active Member 10 Years

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    Location:
    North Curl Curl, Australia
    Dear All
    I'm baffled with the decine of these Thuja's.
    We've been in drought for a few years but the area is irrigated.
    The ground water is high alkaline with magnesium being in the upper limits.
    Heavy clay loam soil.
    I've sent soil and foliage samples for pathology.
    In the meanwhile, as the species is from your corner of the globe, I'm hoping to pick your brains
    All opinions, theories and suggestions are warmly appreciated

    sorry for the wrong way up pics.
    Unsure what’s happening here
     

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  2. Ron B

    Ron B Paragon of Plants 10 Years

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    Location:
    WA USA (Z8)
    Highly popular 'Smaragd' cultivar from Denmark. Adjacent grass is all dried out, what is current weather like relative to prior years? Because an exterior scorching of the conifer foliage like that seems likely to be heat damage. Otherwise of course hopefully the service you are using will come up with a reliable determination.
     
  3. Puddleton

    Puddleton Active Member 10 Years

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    Location:
    North Curl Curl, Australia
    Thanks Ron
    The drought broke last March.
    These photo's were taken last February (late summer)
    I'm baffled by the isolated effect
    Available soil moisture was consistent throughout the last growing season.
    It's reasonably damp now being mid winter
    I've noticed a few are planted too deep.
    There's no sign of root flare
    My thoughts were leaning towards collar rot
     

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