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Oviposition of single females of the cabbage root flies delia radicum and delia floralis diptera anthomyiidae in the laboratory



Oviposition of single females of the cabbage root flies delia radicum and delia floralis diptera anthomyiidae in the laboratory



Annales Entomologici Fennici 50(3): 81-84



The egg-laying of individual cabbage root flies kept isolated in small cages was observed daily from emergence onwards. The flies oviposited during 2-3 day periods at 8-9 day intervals. During their lifetime the females of the smaller, bivoltine species, D. radicum, laid fewer eggs (.apprx. 130) than the females of the univoltine D. floralis (.apprx. 210). D. floralis laid more eggs per batch than D. radicum. In D. floralis the number of eggs per batch decreased with age, but in D. radicum it increased. D. floralis allocated more resources to oviposition in early life than D. radicum. The general hypothesis is presented that in insects egg batch size is related to the extent to which reproductive energy is obtained from adult feeding. For the 1st few egg batches, D. radicum may be expected to rely more than D. floralis on energy obtained by feeding at flowers; the overall importance of flowers may be assumed to be greater for D. floralis. The implications for managing flowering plant stands near crucifer crops are discussed.

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Accession: 006051757

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