Seed-insect Fauna of Pre-dispersal Acorns and Acorn Seasonal Fall Patterns of Quercus variabilis and Q. serrata in Central Japan

概要

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The seed-insect fauna of pre-dispersal acorns and acorn seasonal fall patterns were investigated in a mixed stand of Quercus variabilis and Q. serrata in central Japan. Five coleopteran species, one hymenopteran species and six lepidopteran species were found in pre-dispersal acorns of Q. variabilis and/or Q. serrata. In Q. variabilis, Characoma ruficirra (Lepidoptera : Noctuidae) was the most dominant species, followed by Poecilips cardamomi (Coleoptera : Scolytidae). On the other hand, acorns of Q. serrata were dominantly infested by a cynipid gall wasp. P. cardamomi and Cydia glandicolana (Lepidoptera : Tortricidae) were found in both Q. variabilis and Q. serrata acorns. There was an obvious difference in the falling period of insect-damaged acorns. Developing acorns absorbed by Mechoris ursulus (Coleoptera : Attelabidae) and those attacked by P. cardamomi, a cynipid wasp and C. ruficirra mainly fell before September, whereas those attacked by M. ursulus, Curculio robustus (Coleoptera : Curculionidae), Curculio sikkimensis (Coleoptera : Curculionidae) and tortricid moths and/or a blastobasid moth fell after September as sound acorns. This difference in seasonal fall of insect-damaged acorns would be closely associated with the difference in the time of attack and oviposition by seed insects.
日本昆虫学会の論文
1999-06-25