Food preference of a polyphagous leaf beetle, Atrachya menetriesi Faldermann (Coleoptera: Chrysomelidae).

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  • KUBO Takao
    Laboratory of Entomology, Faculty of Agriculture, Hirosaki University
  • ANDO Yoshikazu
    Laboratory of Entomology, Faculty of Agriculture, Hirosaki University

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  • 広食性昆虫ウリハムシモドキの食物選択
  • コウショクセイ コンチュウ ウリハムシモドキ ノ ショクモツ センタク

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Four species of food plants, Triforium repens L., Taraxacum officinale WEBER, Rumex obtusfolium L. and Dactylis glomerata L. were tested for the preference by Atrachya menetriesi under laboratory conditions. Choice experiments showed no evidence for the orientation to a particular food plant. Both larvae and adults appear to reach food plants by random locomotion. The newly hatched larvae fed on any of those they had first reached. However, 3rd instar larvae and adults discriminated the different food plants when they probed by biting (1) the dandelion was most preferred, followed by (2) the white clover and (3) the dock in this order. The orchard grass was not fed at all. When larvae were reared on a favoured food plant, they grew faster, showed a higher percentage of emergence and heavier adult weight than on a non-favoured food plant. The suitability for development in this highly polyphagous species is thus strongly correlated with the feeding preference.

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