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I mention Tanacetum because experts fail to mention larvae in their material. I was just discussing this with my Wife yesterday. I deduce that the so-called experts are not telling us the truth: host plant only concerns larvae and eggs. By just specifying "host plant" in a work, the author makes it seem as though the species will not be seen on other plants. I am confident with my decision that the plant does not matter unless it concerns larvae.

I looked at old threads yesterday after posting. I noticed this person named Valery posting in the threads. I assume that Valery is an expert with Fruit Flies. I imagine Valery is busy and that is understandable. I respect his time. All is good :)

I have to believe that the species in this photo is certainly C. jaceae. I will give up on this thread now.

Thank You Sundew for taking time to weigh in on this topic. I appreciate the help. You live in Berlin? I live in Berlin. :)