Just today and yesterday I have seen numerous flies, maybe a little larger
than a hoverfly but otherwise similar, but with bright yellow bodies and
black wings (seen at rest). These have all been apparently laying eggs, or
doing sometthig very similar with their rear end, in or on the stems of
roses- all but one of these were on young succulent rose stems. They spend
several minutes doing whatever they are doing, then fly away. Does anyone
recognise this description, and if so, what are they, are they harmful,
beneficial, or interesting? They certainly LOOK interesting.....

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