UK Fungi

Rust on Walnut (Juglans regia)

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  • September 9, 2018 at 5:25 pm #31021
    jimmymac2

      Hello

      I found this rust in a communal garden in Painswick, Gloucestershire on several walnut leaves. Again as I didn’t have permission to collect fungi I had to make do with a photo. I have looked in the Henderson Host Plant Guide however there aren’t any species listed under Juglans. Does anyone have any experience with rusts on walnuts?

      Thanks a lot

      James

      September 9, 2018 at 6:21 pm #41217
      NickWood

        I may well be wrong, but rather than being rust or fungal, the growths may be caused by the Walnut Leaf Gall Mite (Aceria erinea) or similar Eriophyidae spp.

        Nick

        September 9, 2018 at 6:24 pm #41218
        jimmymac2

          Thanks Nick, I had gone for rust due to the orange colour and I’d assumed the black spots on the surface were pycnidia, but I’ll chase that lead.

          James

          September 9, 2018 at 6:56 pm #41219
          NickWood

            I hope I haven’t sent you on a wild goose chase, James. Having just seen an image of Pear Rust (Gymnosporangium sabinae) with a similar cluster of tiny black specks, I’ve got a feeling I may well have! Time for expert advice!

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