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- W1982696317 abstract "Abstract Damage by apple leafcurling midge Dasineura mali, and the numbers of its predators Orius vicinus and Sejanus albisignata, were monitored from 1994 to 1998 on terminal, lateral, spur, and fruiting shoots of a range of apple cultivars under integrated and organic pest management at Clyde, Central Otago. The predators were also monitored using beating trays. The phenology of egg laying and damage by apple leafcurling midge, and the adult numbers of its egg parasitoid Platygaster demades, were recorded on ‘Royal Gala’ apples from 1997 to 2000 at the same location. Apple leafcurling midge completed three to four generations per year depending on summer temperatures, with greatest larval damage by the second generation in December/January, particularly to terminal and lateral shoots. Although each apple cultivar was planted in a discrete block, there were large differences in damage which persisted over several seasons, suggesting significant variation in cultivar susceptibility. Colonisation of the trees by P. demades was slow but monitoring of adult numbers indicated good synchronisation with midge egg laying from the 1998–99 season. Both predatory bug species occurred at higher density on midge-damaged shoots than on undamaged shoots. Analysis of midge damage in relation to the population density of the bugs indicated that midge damage fell in response to high densities of S. albisignata and was high only when this species was at low density. On the other hand, O. vicinus appeared to be a minor predator because higher densities of O. vicinus were correlated with higher midge damage and there was no evidence that this led to a later reduction in the midge population. This research has indicated that P. demades, S. albisignata, and plant resistance can all play an important role in the biological control of apple leafcurling midge. Keywords: gall midge Orius vicinus Sejanus albisignata Platygaster demades biological control Acknowledgements We thank Mr Alister O'Brien, Orchard Manager, and his staff at Clyde Research Centre for their excellent cooperation in the conduct of this research. We thank Dr J. T. S. Walker and Mr P. W. Shaw for reviewing an earlier draft of this paper. The research was jointly funded by the New Zealand Foundation for Research Science and Technology (Biological Orchard Production Systems Programme, Contract CO6519), ENZA New Zealand, and Pipfruit New Zealand Inc. Additional informationNotes on contributorsC. H. Wearing Current address: 251 Hill Road, The Gardens, Auckland 2105, New Zealand." @default.
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- W1982696317 date "2013-07-01" @default.
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- W1982696317 title "Phenology and distribution of the apple leafcurling midge (<i>Dasineura mali</i>(Kieffer)) (Diptera: Cecidomyiidae) and its natural enemies on apples under biological and integrated pest management in Central Otago, New Zealand" @default.
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- W1982696317 doi "https://doi.org/10.1080/00779962.2012.712887" @default.
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