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28 May 24 R&D News

Phytophthora biodiversity in kiwifruit, BS20148, October 2023

This Zespri Innovation project aimed at understanding the diversity of Phytophthora species associated with kiwifruit in New Zealand as well as the risk Phytophthora species pose to the kiwifruit industry. This project surveyed 128 kiwifruit orchards from different kiwifruit growing regions in New Zealand and identified the Phytophthora species present in leaf, and plant-associated soil and root samples. The survey found no Phytophthora species from leaf samples but often found them in the soil and root samples. There were 11 species identified, with no New-to-New Zwaland Phytophthora detected. This research supports the kiwifruit industry to enhance our knowledge on biosecurity risks for Phytophthora species, and allows the industry to: Establish a comprehensive understanding of Phytophthora species present in kiwifruit orchards in New Zealand. Provide baseline data to rule out potential biosecurity risks from a Phytophthora species that was previously not reported to be present in New Zealand. A full summary of the report can be found here.
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28 May 24 R&D News

Understanding how different kiwifruit growing communities engage with biosecurity practices and resources, BS22143, July 2023

This project aimed to gather information from different kiwifruit growing communities, focussing on how well they understand biosecurity and engage with biosecurity resources, training, and practices, and what barriers affect this engagement. A summary of the report can be found here.
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28 May 24 R&D News

Brown Marmorated Stink Bug (BMSB) surveillance in the Bay of Plenty, BS20140, July 2021

This report summarises the 2020-2021 Brown Marmorated Stink Bug (BMSB) surveillance project, which set out with the aim to establish a trapping network to identify whether BMSB is present or enters the Bay of Plenty during active monitoring. The project also sought to provide appropriate identification, trapping, and monitoring training for kiwifruit industry members. The Bay of Plenty region has been included in the national BMSB surveillance programme twice now, with 24 traps set at 12 locations across the region in November 2020. BMSB was not detected by any traps or monitoring activities associated with the Bay of Plenty surveillance network within the 2020-21 year. Read the report here or view an industry BMSB monitoring video here.
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28 May 24 R&D News

Research Summary: Ceratocystis Readiness Programme, BS20150, July 2023

Below is a summary of the research completed from our most recent research programme for Ceratocystis fimbriata, which is looking to improve kiwifruit industry preparedness through enhancing our management practices and knowledge of this organism. Read the summary here.
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28 May 24 R&D News

Kiwifruit Trunk Disease: Nectriaceae associated with vine decline of kiwifruit, BS19004 objectives 2/3 and 3/3, August 2023

Objective 2: This project aimed to test the pathogenicity of three species/groups of the most prevalent Fusarium species identified in Objective 1. The project demonstrated that the Fusarium solani complex was the most pathogenic to kiwifruit, of those species tested. Although the other two species were able to establish in the vines, they did not move far from the inoculation site, and it was unclear whether these species are primary pathogens in kiwifruit. These tests validate what is being observed on-orchard, where Fusarium solani is being isolated from a greater proportion of Kiwifruit Trunk Disease symptoms than many other organisms. Objective 3: A literature review was completed to identify potential management options for Fusarium to support and inform management decisions by growers. There is no published information on control options for Fusarium solani in kiwifruit vines and little for other hosts. So, most of the management is centered around good biosecurity practices on-orchard which reduce inoculum and spread of the pathogen. Read the report here.
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28 May 24 R&D News

Field assessment of seasonal occurrence of Lycorma delicatula, the Spotted Lanternfly, and its potential impacts on kiwifruit, BS20154, October, 2023

The Spotted Lanternfly (SLF) is considered a significant threat to kiwifruit and is not yet present in New Zealand. It has spread rapidly outside its native range of China, into South Korea, Japan and more recently the USA. From translating Chinese literature, SLF was identified as a ‘major pest’ of kiwifruit, although the level of impact remains somewhat unknown. To help address this uncertainty, this project sought to provide a better understanding of the seasonal occurrence of SLF in kiwifruit and potential impacts. The study was undertaken in China on organically grown green (Hayward) and yellow (Nongda Jinmi) kiwifruit varieties. Weekly inspections were undertaken and all life stages were found in kiwifruit, however SLF appeared more abundant in the yellow variety. A single generation was observed from mid-April till late-September. This study presented no evidence for SLF feeding damage or sooty mold production on those kiwifruit blocks studied. It us important to note that the research was done in its native range and on a small scale so may not fully represent impact of SLF if an incursion was to occur in New Zealand. Read the report here.
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