Relevant bibliographies by topics / Kauri Dieback

Academic literature on the topic 'Kauri Dieback'

Author: Grafiati
Published: 10 December 2022
Last updated: 28 January 2023

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Journal articles on the topic "Kauri Dieback"

1

Hood, Ian. "Kauri dieback." Plant Pathology 70, no. 4 (April 4, 2021): 764–66. http://dx.doi.org/10.1111/ppa.13356.

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2

Waipara, N. W., J. Craw, A. Davis, J. Meys, B. Sheeran, A. Peart, S. Hill, et al. "Management of kauri dieback." New Zealand Plant Protection 62 (August 1, 2009): 407. http://dx.doi.org/10.30843/nzpp.2009.62.4854.

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Kauri illthrift commonly known as Kauri dieback has been identified as an increasing problem affecting kauri (Agathis australis) across the Auckland region A water and soilborne pathogen Phytophthora taxon Agathis (PTA) has been identified as a causal agent of Kauri dieback at some locations particularly within the Waitakeres Ranges Regional Park and Great Barrier Island PTA is associated with a collar rot causing large bleeding basal lesions yellowing foliage and tree death A range of other causal agents including Phytophthora cinnamomi and environmental stress factors were also associated with symptoms at many sites In 2008 Auckland Regional Council implemented a range of standard operational procedures to manage the disease across the region Surveillance surveys are underway to assess overall tree health as well as the potential distribution of PTA in Aucklands kauri forests Survey sites were prioritised in areas with high conservation value iconic trees or high levels of soil disturbance such as tracks intersecting kauri root zones Risk management of the suspected primary vectors of the PTA including people and feral pigs is underway
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3

Waipara, N. W., S. Hill, L. M. W. Hill, E. G. Hough, and I. J. Horner. "Surveillance methods to determine tree health distribution of kauri dieback disease and associated pathogens." New Zealand Plant Protection 66 (January 8, 2013): 235–41. http://dx.doi.org/10.30843/nzpp.2013.66.5671.

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Kauri dieback is a pest issue that is increasingly affecting kauri forests A water and soilborne pathogen Phytophthora taxon Agathis (PTA) has been identified as a causal agent of kauri dieback at multiple locations particularly within Auckland and Northland In 2008 a passive surveillance and adaptive management programme was initiated to manage the disease across the natural range of kauri Surveys were initially undertaken to determine the distribution and rate of spread of kauri dieback on private land in the Auckland region Methods to evaluate and monitor overall tree health disease symptoms and other potential contributing factors were developed Diagnostic sampling was undertaken to isolate and identify pathogens associated with kauri dieback Along with PTA other Phytophthora species and environmental stress were frequently associated with symptoms at over 400 properties inspected Further management is now required to develop control tools and mitigate further spread
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4

Hill, Lee, Edward Ashby, Nick Waipara, Robin Taua-Gordon, Aleesha Gordon, Fredrik Hjelm, Stanley E. Bellgard, Emma Bodley, and Linley K. Jesson. "Cross-Cultural Leadership Enables Collaborative Approaches to Management of Kauri Dieback in Aotearoa New Zealand." Forests 12, no. 12 (November 30, 2021): 1671. http://dx.doi.org/10.3390/f12121671.

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In Aotearoa/New Zealand, the soilborne pathogen Phytophthora agathidicida threatens the survival of the iconic kauri, and the ecosystem it supports. In 2011, a surveillance project to identify areas of kauri dieback caused by Phytophthora agathidicida within the Waitākere Ranges Regional Park (WRRP) highlighted the potential impact of the pathogen. A repeat of the surveillance in 2015/16 identified that approximately a quarter of the kauri area within the Regional Park was infected or possibly infected, an increase from previous surveys. The surveillance program mapped 344 distinct kauri areas and showed that 33.4% of the total kauri areas were affected or potentially affected by kauri dieback and over half (58.3%) of the substantial kauri areas (above 5 ha in size) were showing symptoms of kauri dieback. Proximity analysis showed 71% of kauri dieback zones to be within 50 m of the track network. Spatial analysis showed significantly higher proportions of disease presence along the track network compared to randomly generated theoretical track networks. Results suggest that human interaction is assisting the transfer of Phytophthora agathidicida within the area. The surveillance helped trigger the declaration of a cultural ban (rāhui) on recreational access. Te Kawerau ā Maki, the iwi of the area, placed a rāhui over the kauri forest eco-system of the Waitākere Forest (Te Wao Nui o Tiriwa) in December 2017. The purpose of the rāhui was to help prevent the anthropogenic spread of kauri dieback, to provide time for investment to be made into a degraded forest infrastructure and for research to be undertaken, and to help protect and support forest health (a concept encapsulated by the term mauri). Managing the spread and impact of the pathogen remains an urgent priority for this foundation species in the face of increasing pressures for recreational access. Complimentary quantitative and qualitative research programs into track utilization and ecologically sensitive design, collection of whakapapa seed from healthy and dying trees, and remedial phosphite treatments are part of the cross-cultural and community-enabled biosecurity initiatives to Kia Toitu He Kauri “Keep Kauri Standing”.
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5

Jamieson, A., I. E. Bassett, L. M. W. Hill, S. Hill, A. Davis, N. W. Waipara, E. G. Hough, and I. J. Horner. "Aerial surveillance to detect kauri dieback in New Zealand." New Zealand Plant Protection 67 (January 8, 2014): 60–65. http://dx.doi.org/10.30843/nzpp.2014.67.5723.

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The causal agent of kauri dieback Phytophthora taxon Agathis (PTA) poses a significant threat to kauri (Agathis australis) in northern New Zealand Groundbased field surveys have previously confirmed PTA presence at several locations across Auckland and Northland However ground surveys are limited to areas adjacent to tracks because of difficulty and cost associated with offtrack access in steep terrain along with concern about furthering spread of PTA A methodology for aerial photographic surveillance of kauri dieback was developed and implemented in Wait257;kere Ranges Hunua Ranges and adjacent forest areas Using recently developed GPS technology photographs were embedded with position data so unhealthy trees were easily located later for groundtruthing Aerial survey was found to be a time and costeffective method for surveying large inaccessible areas of forest for kauri dieback The methodology would also be applicable for detection of visible disease or damage symptoms in other canopy tree species
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6

Horgan, D. B. "The uptake of phosphorus acid sprays into kauri foliage." New Zealand Plant Protection 70 (July 31, 2017): 326. http://dx.doi.org/10.30843/nzpp.2017.70.96.

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Kauri dieback caused by Phytophthora agathidicida is a serious problem affecting forests throughout the upper North Island. A potential control tool is the use of phosphorus acid (phosphite) as a foliar spray. This study investigates various commercial formulations of phosphorus acid in combination with adjuvants, for their potential uptake into kauri foliage. Large differences were seen in the uptake between the upper (adaxial) and lower (abaxial) leaf surfaces. The upper kauri leaf surface gave negligible uptake (<5%) while the lower surface had >65% uptake across all formulations tested. From these results, the potential for spray operations is discussed.
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7

Thurston, Alana M., Lauren Waller, Leo Condron, and Amanda Black. "Sensitivity of the soil-borne pathogen Phytophthora agathidicida, the causal agent of kauri dieback, to the anti-oomycete fungicides ethaboxam, fluopicolide, mandipropamid, and oxathiapiprolin." New Zealand Plant Protection 75 (May 3, 2022): 14–18. http://dx.doi.org/10.30843/nzpp.2022.75.11751.

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The oomycete Phytophthora agathidicida is the causal agent of kauri dieback, which threatens the survival of endemic kauri (Agathis australis) forests in Aotearoa|New Zealand. Current chemical control of P. agathidicida involves the application of either a mixture of halogenated tertiary amines or phosphite salts with some success, but neither treatment cures the disease. Recently, four anti-oomycete fungicides, all with different modes of action, have become commercially available. Here, we determined the inhibition potential of these fungicides on three P. agathidicida isolates, using agar dilution assays. The average concentration required to inhibit mycelial growth by 50% (EC50) for ethaboxam, fluopicolide, and mandipropamid was 0.0916, 0.372, and 0.0196 µg/mL, respectively. Inhibition of P. agathidicida mycelia by oxathiapiprolin and its commercial formulation, Zorvec® Enicade®, was 0.000152 and 0.000309 µg/mL, respectively. Based on the EC50 values reported in this study, these fungicides are the most effective inhibitors of P. agathidicida mycelia when compared to previously screened fungicides, natural products, and plant extracts. Thus, their performance in this initial screening supports further research into their potential use as a kauri dieback management tool.
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8

Horner, I. J., E. G. Hough, and M. B. Horner. "Forest efficacy trials on phosphite for control of kauri dieback." New Zealand Plant Protection 68 (January 8, 2015): 7–12. http://dx.doi.org/10.30843/nzpp.2015.68.5791.

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In 2012 trials were established in four kauri forest sites severely affected by kauri dieback (Phytophthora agathidicida P taxon Agathis PTA) to determine the potential of phosphorous acid (phosphite) as a control tool Baseline assessments of 162 trial trees included canopy disease rating trunk lesion dimensions and lesion activity (recent bleeding/ 20cm intervals around the trunk Control trees were left untreated After 1 year half the previously injected trees were reinjected in all cases with 75 phosphite Phytotoxicity symptoms (leaf yellowing browning or leaf/twig abscission) were noted in some phosphiteinjected trees particularly where the 20 concentration was used After 3 years many more trunk lesions remained active (expressing ooze continued expansion) in untreated trees (585) than in phosphitetreated trees (08) Average lesion expansion after 3 years was 127 cm in untreated and 04 cm in phosphitetreated trees
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9

Herewini, Echo M., Peter M. Scott, Nari M. Williams, and Rosie E. Bradshaw. "In vitro assays of Phytophthora agathidicida on kauri leaves suggest variability in pathogen virulence and host response." New Zealand Plant Protection 71 (June 8, 2018): 285–88. http://dx.doi.org/10.30843/nzpp.2018.71.127.

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Phytophthora agathidicida is an aggressive soil-borne oomycete pathogen that kills New Zealand kauri trees (Agathis australis). When artificially inoculated, P. agathidicida causes lesions on leaves as well as roots, providing a non-invasive method for virulence screening. However, little is known about the extents to which the pathogen varies in virulence and kauri trees vary in disease susceptibility. Three isolates of P. agathidicida grown in culture were inoculated onto detached leaves from six kauri trees. Visible disease lesions were measured and the extent of asymptomatic leaf colonisation determined by culturing. All six trees were susceptible to P. agathidicida, but one showed higher susceptibility than the others. The pathogen also showed variability in virulence among isolates. Asymptomatic colonisation of leaf tissue was also found, suggesting a latent or biotrophic phase for the pathogen. Although further work is needed, the variability of both pathogen virulence and host susceptibility have important implications for management of kauri dieback. Furthermore, asymptomatic colonisation of kauri tissues suggests that P. agathidicida could be present outside of regions with visible disease symptoms.
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10

Meiforth, Jane J., Henning Buddenbaum, Joachim Hill, James Shepherd, and David A. Norton. "Detection of New Zealand Kauri Trees with AISA Aerial Hyperspectral Data for Use in Multispectral Monitoring." Remote Sensing 11, no. 23 (December 2, 2019): 2865. http://dx.doi.org/10.3390/rs11232865.

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The endemic New Zealand kauri trees (Agathis australis) are of major importance for the forests in the northern part of New Zealand. The mapping of kauri locations is required for the monitoring of the deadly kauri dieback disease (Phytophthora agathidicida (PTA)). In this study, we developed a method to identify kauri trees by optical remote sensing that can be applied in an area-wide campaign. Dead and dying trees were separated in one class and the remaining trees with no to medium stress symptoms were defined in the two classes “kauri” and “other”. The reference dataset covers a representative selection of 3165 precisely located crowns of kauri and 21 other canopy species in the Waitakere Ranges west of Auckland. The analysis is based on an airborne hyperspectral AISA Fenix image (437–2337 nm, 1 m2 pixel resolution). The kauri spectra show characteristically steep reflectance and absorption features in the near-infrared (NIR) region with a distinct long descent at 1215 nm, which can be parameterised with a modified Normalised Water Index (mNDWI-Hyp). With a Jeffries–Matusita separability over 1.9, the kauri spectra can be well separated from 21 other canopy vegetation spectra. The Random Forest classifier performed slightly better than Support Vector Machine. A combination of the mNDWI-Hyp index with four additional spectral indices with three red to NIR bands resulted in an overall pixel-based accuracy (OA) of 91.7% for crowns larger 3 m diameter. While the user’s and producer’s accuracies for the class “kauri” with 94.6% and 94.8% are suitable for management purposes, the separation of “dead/dying trees” from “other” canopy vegetation poses the main challenge. The OA can be improved to 93.8% by combining “kauri” and “dead/dying” trees in one class, separate classifications for low and high forest stands and a binning to 10 nm bandwidths. Additional wavelengths and their respective indices only improved the OA up to 0.6%. The method developed in this study allows an accurate location of kauri trees for an area-wide mapping with a five-band multispectral sensor in a representative selection of forest ecosystems.
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Book chapters on the topic "Kauri Dieback"

1

Lambert, Simon, Nick Waipara, Amanda Black, Melanie Mark-Shadbolt, and Waitangi Wood. "Indigenous Biosecurity: Māori Responses to Kauri Dieback and Myrtle Rust in Aotearoa New Zealand." In The Human Dimensions of Forest and Tree Health, 109–37. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-76956-1_5.

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