Hitherto Unknown Galls of the Aphid Colophina clematicola (Homoptera) Experimentally Induced on Leaves of Zelkova serrata
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No gall of the aphid Colophina clematicola has hitherto been found despite the fact that its woolly colonies are rather commonly found on the secondary host, Clematis terniflora, in Japan. We collected sexuparae of the aphid from the secondary host in autumn and transferred them to a potted tree of Zelkova serrata. Several leaf-rolled galls were formed in the following year, and one of them produced alate emigrants in September. The number of male embryos in each sexupara was not constant, as was predicted from the bad-gene hypothesis. First-instar nymphs of the gall generation attacked a maggot that had been introduced onto the surface of a gall. The gall generation of C. clematicola are described.