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Help, what is this alien?

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I have found this on the leaves on my pear tree, it produced barely any fruit this year and I imagine this is the reason. 

Firstly can anyone tell me what it is? But also, how have I caught it, can I get rid of it, and will it effect other plants. 

The pours of this fungus are now pouring out of the leaves. 

Thanks for any help

Chris

Posts

  • PalustrisPalustris Posts: 4,307

    Pear rust.

    It needs a Juniper to complete its life cycle so there must be one somewhere nearby. Remove the juniper if you can.

    Lots of other advice on the RHS site.

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