Fungus, Disease, or Insects?

Discussion in 'Trees, Shrubs and Roses' started by Robert Collins, Sep 11, 2020.

  1. Robert Collins

    Robert Collins New Seed

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    I have 2 Persian Lilac trees growing in large pots. I was hoping you could give me some advice based on the pictures I am attaching. As you can see, on one of the trees, the leaves are in pretty bad shape. When new foilege grows, it only stays green for a short period of time before turning brown like the existing leaves. The second tree was really thriving, but now it, too, is starting to turn brown.

    I was hoping you might be able to diagnose this for me. Does this appear to be some kind of fungus or is it perhaps a insect causing this (though I am not seeing any)? And based on your diagnosis, what product would you suggest as a remedy? As you can also see from the pictures, the Azaleas growing under the lilac tree are also in bad shape. I have to think, from the proximity, that whatever is causing one is likely causing the other.

    Thanks, in advance, for any advice you can provide.

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  3. Palustris

    Palustris Young Pine

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    Looks very much like Sooty mould. At sometime there must have been greenfly on the plants and the mould has grown on their honeydew, ( basically aphid urine).
    So first of all deal with the aphids then the mould. There are fungicides which claim to help fight it.
     
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