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Reproductive strategies of Diaeretiella rapae (Hymenoptera: Aphidiinae) during fluctuating temperatures of spring season in New Zealand

Kant, Rashmi and Minor, M. and Trewick, S. (2012) Reproductive strategies of Diaeretiella rapae (Hymenoptera: Aphidiinae) during fluctuating temperatures of spring season in New Zealand. Biocontrol Science and Technology, 22 (1). pp. 1-9. ISSN 0958-3157

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    Abstract

    Reproductive activities of naturally occurring population of Diaeretiella rapae (M’Intosh) (Hymenoptera: Aphidiinae) on Myzus persicae were studied during spring season in New Zealand. The cabbage seedlings were highly infested with the aphids (272+-25 individuals/plant) with about 30% on average parasitised by D. rapae. Rate of parasitism was positively correlated with the aphid density(R2-�0.64). Adult emergence from aphid mummies was 90%, with a higher frequency of females than males. Increase in female/male sex ratio was found between early and late spring (1.1 vs. 1.8). Mating in D. rapae occurred throughout the day. Nearly half of the mating pairs collected were male�-male pairs, which were especially prevalent during morning and evening while more male-�female mating pairs were found during midday. Male�-male mounting was probably because of low number of virgin females in morning and evening populations. About 80% females were mounted by smaller size males. Male�-male mounting is discussed in correlation with operational sex ratio of D. rapae population.

    Item Type: Journal Article
    Subjects: S Agriculture > S Agriculture (General)
    Divisions: Faculty of Business and Economics (FBE) > School of Agriculture and Food Technology
    Depositing User: Rashmi Kant
    Date Deposited: 27 Aug 2013 10:43
    Last Modified: 02 Aug 2016 11:39
    URI: http://repository.usp.ac.fj/id/eprint/6394
    UNSPECIFIED

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