Phragmidium fragariae on Barren Strawberry

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  • June 12, 2015 at 5:55 pm #29461
    Lancashire Lad
    Moderator

      Found yesterday,

      Aecidial stage of Phragmidium fragariae on Potentilla sterilis – Barren Strawberry.

      Click on images to view at full size.

      Phragmidium fragariae on Potentilla sterilis.jpg

      [attachment=2]Phragmidium fragariae on Potentilla sterilis.jpg[/attachment]Caeomoid aecidia on underside of leaves.

      Phragmidium fragariae Aecidiospores x400 110615.jpg

      [attachment=1]Phragmidium fragariae Aecidiospores x400 110615.jpg[/attachment]Aecidiospores x400.

      Even with the dire resolution from the Minicam, it can be seen that these spores are densely verrucose.

      Phragmidium fragariae Aecidiopores x400 110615 Measured.jpg

      [attachment=0]Phragmidium fragariae Aecidiopores x400 110615 Measured.jpg[/attachment]Aecidiospores x400 with annotated measurements.

      The measured spores fell nicely within the expected size range given in Wilson & Henderson’s “British Rust Fungi”.

      Regards,

      Mike.

      June 12, 2015 at 6:55 pm #34952
      adampembs
      Keymaster

        Hardly any tell-tale signs from the top view. I suppose you really have to check under all the leaves.

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