Larvae of the coffee bean weevil, <i>Araecerus fasciculatus</i> (DeGeer) (Coleoptera: Anthribidae), feeding on pith of the giant ragweed in Osaka, Central Japan

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  • Yamazaki Kazuo
    Osaka City Institute of Public Health and Environmental Sciences
  • Sugiura Shinji
    Laboratory of Forest Ecology, Graduate School of Agriculture, Kyoto University

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  • オオブタクサ茎の髄も摂食するワタミヒゲナガゾウムシ<i>Araecerus fasciculatus</i> (DeGeer) (Coleoptera: Anthribidae) の幼虫
  • Larvae of the coffee bean weevil, Araecerus fasciculatus (DeGeer) (Coleoptera: Anthribidae), feeding on pith of the giant ragweed in Osaka, Central Japan

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Abstract

We observed that the larvae of coffee bean weevil Araecerus fasciculatus DeGeer (Coleoptera: Anthribidae), a cosmopolitan pest infesting various stored crops such as cottonseed, coffee bean and orange fruits, bored into dead stems of the giant ragweed Ambrosia trifida (Asteraceae) at the riverbank of the Yamato River, Osaka City, central Japan. The larvae fed on the pith of the giant ragweed, pupated and eclosed in the pith and exit from it. Judging from the size of the larvae that were found in the field and developmental period which has been reported so far, oviposition may have occurred from autumn to early winter when the giant ragweed ceased its growth. The giant ragweed may function as a breeding site for A. fasciculatus in natural setting, resulting in infestation to orange fruits and stored crops.

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