ORCID Profile
0000-0001-5931-5996
Current Organisations
The University of Newcastle
,
The New Zealand Institute for Plant & Food Research Limited
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Publisher: Informa UK Limited
Date: 18-11-2019
Publisher: Informa UK Limited
Date: 02-01-2014
Publisher: Wiley
Date: 12-10-2001
Publisher: Informa UK Limited
Date: 04-06-2014
Publisher: Informa UK Limited
Date: 07-2013
Publisher: Springer Science and Business Media LLC
Date: 18-02-2017
Publisher: Informa UK Limited
Date: 10-01-2023
Publisher: Elsevier BV
Date: 2022
Publisher: Springer Science and Business Media LLC
Date: 05-06-2020
Publisher: Wiley
Date: 07-2002
Publisher: Elsevier BV
Date: 05-2023
Publisher: New Zealand Plant Protection Society
Date: 31-08-2021
DOI: 10.30843/NZPP.2021.74.11743
Abstract: The greenhouse thrips, Heliothrips haemorrhoidalis is a quarantine pest of kiwifruit. There is a need for reliable information on its phenology in kiwifruit orchards to inform the development of new management options. Numbers of larval, pupal and adult greenhouse thrips were counted on leaves of the two main kiwifruit cultivars Actinidia chinensis var. deliciosa (‘Hayward’) at two sites at different times and A. chinensis var. chinensis ‘Zesy002’ at one site. Greenhouse thrips were also counted on leaves of shelter tree species Cryptomeria japonica, and other plants present on kiwifruit orchards, blackberry (Rubus fruticosus s.l.), barberry (Berberis glaucocarpa), and wineberry (Aristotelia serrata) across a number of sites at different times. There was a strong seasonal pattern to the phenology of greenhouse thrips and it was relatively synchronous for all the host plants surveyed. In general, number of greenhouse thrips on foliage increased from January to peak in April or May before declining in late autumn or winter and remaining low until the following January or February. The phenology of greenhouse thrips followed the same seasonal pattern for a variety of host plants found on kiwifruit orchards at sites in the Bay of Plenty across two two-year time periods. Therefore, host species does not appear to be a factor affecting the phenology of thrips. Other, non-host factors such as microclimate may be important drivers of phenology but they require further study. The consistency of the seasonal pattern of relative abundance means that there is a well-defined window to target for thrips management.
Publisher: Wiley
Date: 27-08-1999
Publisher: Informa UK Limited
Date: 28-01-2021
Publisher: Elsevier BV
Date: 02-2020
Publisher: Wiley
Date: 11-1999
Publisher: Wiley
Date: 06-12-2011
Publisher: Wiley
Date: 04-01-2007
Publisher: Wiley
Date: 11-1999
Publisher: Cambridge University Press (CUP)
Date: 07-2003
DOI: 10.1079/BER2003245
Abstract: In this study, the question of whether Childers canegrub, Antitrogus parvulus (Britton) overwinters in the subsoil was addressed. Irrigated fields of sugarcane were s led during a 2-year period near Bundaberg in southern Queensland. Antitrogus parvulus overwintered as second and third instars at each of three sites. During autumn and winter third instars of different allochronic (separated in age by 12 months) populations occurred together and could not be readily separated. Field-collected third instars were reared on ryegrass and separated into two age groups based on the date of pupation. Third instars in the first year of their life cycle (young third instars) remained at shallow depth (100–200 mm) and did not overwinter in the subsoil as once thought. Minimum temperatures during winter were 13–16°C and did not prevent young third instars from feeding and gaining weight. Third instars in their second and final year moved downwards from late summer and pupated in the subsoil at 293–425 mm in spring. General phenology was as previously reported with first instar larvae occurring from January until April, second instars from January until November and third instar larvae throughout the year. Prepupae and pupae were found between October and December and adults occurred in soil during November and January. Batches of eggs occurred at a mean depth of 350 mm. First and second instars occurred predominantly at relatively shallow (100–200 mm) depths in the soil profile. All stages tended to be most common under rows of sugarcane rather than in the interrow.
Publisher: Springer Science and Business Media LLC
Date: 13-09-2022
DOI: 10.1007/S00466-022-02227-1
Abstract: The discrete element method (DEM) is the most dominant method for the numerical prediction of dynamic behaviour at grain or particle scale. Nevertheless, due to its discontinuous nature, the DEM is inherently unable to describe microscopic features of in idual bodies which can be considered as continuous bodies. To incorporate microscopic features, efficient numerical coupling of the DEM with a continuous method is generally necessary. Thus, a generalised multi-scale PD–DEM framework is developed in this work. In the developed framework, meshfree discretised Peridynamics (PD) is used to describe intra-particle forces within bodies to capture microscopic features. The inter-particle forces of rigid bodies are defined by the DEM whereas a hybrid approach is applied at the PD–DEM interface. In addition, a staggered multi-scale time integration scheme is formulated to allow for an efficient numerical treatment of both methods. Validation ex les are presented and the applicability of the developed framework to capture the characteristics mixtures with rigid and deformable bodies is shown.
Location: New Zealand
No related grants have been discovered for david logan.