I'd guess the flies are specialized (although perhaps to a few different kinds of plants); most insects tend to be fairly specific about where they lay their eggs.
...and urgh, I have never encountered blackberry-maggots and now I feel slightly queasy at the prospect.
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timeasmymeasure
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Date: 2012-08-21 10:27 pm (UTC)...and urgh, I have never encountered blackberry-maggots and now I feel slightly queasy at the prospect.