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  • Looking at Geranium sawfly larvae

    Miranda Hodgson on 29 Aug 2012 at 02:11 PM

    As if it wasn’t enough to have sawfly larvae eating rose leaves, another type have been spotted eating the leaves of a hardy Geranium (possibly Geranium ‘Johnson’s Blue’). In June this year, it was noticed that the leaves had been eaten away so that only a skeletal structure of veins remained. The lady who grows the plants hadn’t seen a pest getting at them, but kneeling down for an extended peer at the underside of the leaves revealed tiny, greenish caterpillar-like larvae, slowly but deliberately making a meal of the foliage – the larvae of the Geranium sawfly.


  • What's eating the rose foliage?

    Miranda Hodgson on 13 Aug 2012 at 12:35 PM

    Something is eating the leaves on the roses – if left to it, stem-like leaf veins would be all that remain. Seeing the ragged foliage and looking more closely, I see around the leaf edges tiny creatures that resemble caterpillars. They are not caterpillars, though, they are rose sawfly larvae.

    There are two common species of rose sawfly in the UK, Arge pagana and Arge ochropus, with A. pagana being the most common. As to how they got there, the adult fly, which looks a bit like a brown flying ant, will have laid her eggs in tiny cuts that she made in the leaf, using her saw-like ovipositor (egg-laying organ). The roses that have been affected so far are all young containerised plants - a patio rose, ‘Sweet Dream’, climbing ‘Iceberg’ and ‘Zephirine Drouhin’, as well as some small unknown plants coming on from cuttings, one of which may or may not be ‘New Dawn’.