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- W2023267268 abstract "The various diapause and post-diapause stages entered by cabbage root fly pupae during the overwintering period are shown schematically. Although diapause induction started in mid-Aug., the early-pupating insects did not develop further but were maintained in diapause by the warm autumn temperatures. Therefore, diapause development was simultaneous in all Wellesbourne pupae, whether of second or third generation origin. Diapause development started only in mid-Oct., when mean soil temperatures fell below 10°. In the field, 90% of the overwintering population of cabbage root fly pupae had completed diapause by 5 March 1980, 17 Feb. 1981 and 18 Feb. 1982. This was equivalent to a duration of 19 weeks from mid-Oct. onwards, during the winters of 1979–80, 1980–81 and 1981–82 respectively. A further break between the completion of diapause and the warm conditions required to start post-diapause development also helps to condense the emergence of flies in the spring. Hence, an accurate forecast of the time of spring attack by populations of flies similar to those at Wellesbourne should be possible.RESUMETerminaison de la diapause dans des populations de mouche du chou etudiees sur le terrainLes divers stades de diapause et post-diapause que connaissent les pupes de la mouche du chou durant l'hiver sont representes par des schemas. Bien que la diapause ait commence a la mi-aout les premiers insectes ayant pris la forme de pupes cesserent de se developper et resterent en diapause sous l'effet des temperatures douces d'automne. Le developpement de la diapause se poursuivit donc simultanement pour toutes les pupes de Wellesbourne, qu'elles aient ete a l'origine de la deuxieme ou de la troisieme generation. Le developpement de la diapause ne commenca qu'a la mi-octobre, lorsque la temperature moyenne du sol tomba a moins de 10°. Sur le terrain, 90% de la population de pupes de la mouche du chou ayant passe l'hiver avaient termine leur diapause les 5 mars, 17 fevrier et 18 fevrier, ceci representant une duree de 19 semaines a partir du mi-Octobre, pour les hivers de 1979–80, 1980–81 et 1981–82 respectivement. Un autre intervalle entre l'achevement de la diapause et le temps doux requis pour commencer le developpement post-diapause contribue egalement a condenser l'apparition des mouches au printemps. Il devrait donc ětre possible de prevoir avec exactitude a quel moment au printemps les populations de mouches analogues a celles de Wellesbourne attaqueront les choux." @default.
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- W2023267268 date "1983-09-01" @default.
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- W2023267268 title "COMPLETION OF DIAPAUSE IN FIELD POPULATIONS OF THE CABBAGE ROOT FLY (DELIA RADICUM)" @default.
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- W2023267268 doi "https://doi.org/10.1111/j.1570-7458.1983.tb03316.x" @default.
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