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News and views from KVH about biosecurity in New Zealand's kiwifruit industry. 

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06 Jun 24 Biosecurity News

On the look-out for vine disorders

KVH follow-up of unusual symptoms including “sudden collapse of vines” during flowering or leading up to harvest, often identifies symptoms which have gone unnoticed for some time. Leader dieback; swellings at, above or below the graft; swelling at the trunk crown (base); or cracking, cankering, or swelling of leaders and trunks is often not noticed, as the focus in any production year is generally on the canopy, buds, flowers, and fruit rather than the architecture of vines. A perfect job for autumn and early winter is to complete a monitoring round to assess and act on vine symptoms that have crept in under the radar across the years and which are indicative of kiwifruit vine disorders. Mapping of symptomatic vines allows insight into areas where gaps are emerging, or canopies are becoming sparse due to a decline in vine health. Replacement strategies, such as replanting alongside affected plants or stringing of replacement canes from vines in adjacent rows will allow for the cut-out of infected vines without a significant drop in production. The earlier infected vines are removed the better, as spores from the fungal invaders can be harboured in fruiting bodies within the infected area and spread via soil, water, and air movements. Infections in leaders and canes can also be spread by unclean tools and infections in rootstock can travel across graft unions and impact on newly grafted cultivars. Research projects initiated through the Zespri Biosecurity Innovation portfolio have identified several fungal organisms associated with the various kiwifruit trunk disease symptoms and shown that disease complexes rather than single species are generally involved. Regular monitoring of sites is valuable as new growing situations can change the status of fungal diseases. Different cultivars and rootstock may be more susceptible, marginal growing areas, environmental factors, stressed and aging vines, different management practices (e.g. girdling) and build-up of site inoculum are all factors that can lead to a change in vine impacts. Annual review helps ensure orchards remain resilient and successful into the future. More information on vine decline and trunk diseases is available here and an image library of trunk symptoms to watch out for is available here. If you have unusual symptoms that need follow-up, contact [email protected]
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04 Jun 24 Company Notices

Mystery Creek Fieldays – see you there

We look forward to seeing you at Fieldays next week. We’ll be in the Zespri tent as per previous years, taking part in midday presentations each day providing updates on our biosecurity activities and upcoming Biosecurity Symposium. Gates are open - and we’re on-site - daily from Wednesday to Friday, 8.00am to 5.00pm. For more information and to purchase tickets, visit the Fieldays website.
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04 Jun 24 Company Notices

Upcoming KVH AGM

KVH’s Annual General Meeting (AGM) will take place at 9am, Wednesday 21 August, at Mercury Baypark in Mount Maunganui. Growers will receive their AGM packs by email during the last week of July. This is a public meeting and anyone who is interested is welcome to attend. Special guest Dr Jacqueline Rowarth will be joining us to speak about precision breeding, followed by the NZKGI and then Zespri annual meetings.
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06 Jun 24 Company Notices

Biosecurity Symposium

All growers are invited to attend the 2024 KVH Biosecurity Symposium, which will take place in Mt Maunganui on Wednesday 7 and Thursday 8 August. This event’s theme this year is “Building resilience” and aims to provide an informative and engaging platform for growers, industry professionals, technical staff, and government officials to learn and share their experiences. We’ll be talking more about guest speakers and presentations for each day in future Bulletin’s so be sure to keep a look out for updates.
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04 Jun 24 Biosecurity News

Fun Fact

They’re here, and you can get yours now! The brand-new pest ID cards we mentioned in the last Bulletin are hot off the press so get in touch with your postal address if you’d like a set or two. We’ve created these flashcards to help everyone involved in orchard work improve their pest and disease ID skills – they provide an easy way to identify some of the kiwifruit industry’s biggest biosecurity risks and are a practical tool for out in the field. They’re plastic coated and durable, and held together with a ring you can adjust over time as we produce new cards and update our Most Unwanted list. We’ll have these with us at upcoming events for you too.
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04 Jun 24 Grower News

Wild kiwifruit surveillance planned for Te Puke

A reminder as you may have read in our recent Bulletin and regional newspapers, wild kiwifruit surveillance is planned for Te Puke this month. Early winter, when leaves turn yellow, is the best time to detect wild kiwifruit vines from the air. When a fine weather window presents itself in June KVH will be undertaking aerial surveillance of the Te Puke gullies from No 4 Road to Maungarangi Road. The last time a similar survey was undertaken was in June 2021. Information from the flight will be collated for analysis as part of an ongoing surveillance research project aimed at identifying wild kiwifruit vines through satellite imagery. The data will also be of huge help to the surveillance contractor to quickly find infestations and programme them for control.
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