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Company Notices
24 July 2015
KVH Annual General Meeting 2015
24 July 2015
KVH Incorporated (KVHI) and The KVH Foundation Incorporated (KVHF) held its Annual General Meeting on Thursday 23 July. All resolutions put forward to the members were approved. Click here to...
KVH Annual General Meeting 2015
24 July 2015

KVH Incorporated (KVHI) and The KVH Foundation Incorporated (KVHF) held its Annual General Meeting on Thursday 23 July. All resolutions put forward to the members were approved.

  • Click here to view the resolutions and their explanations.
  • Click here for all the AGM documents, including the Financial Statements, Chairman’s Report and the KVH Activity Report.
R&D News
24 July 2015
R&D reports: 2014-15 potted plant trial results
24 July 2015
Elicitors on Gold3 potted plants, January to March 2015 Field trials on potted Gold3 plants tested efficacy of a range of elicitors in inducing a plant immune response to Psa. TNL3454 (at higher...
R&D reports: 2014-15 potted plant trial results
24 July 2015

Elicitors on Gold3 potted plants, January to March 2015
Field trials on potted Gold3 plants tested efficacy of a range of elicitors in inducing a plant immune response to Psa. TNL3454 (at higher concentrations) and AB48414 showed a level of Psa control comparable to Actigard™ for up to six weeks post-Psa inoculation. Citrox BioAlexin showed some significant Psa control four weeks post inoculation. This product could offer organic growers an elicitor option. However, further trials to prove consistent efficacy would be advisable. ProAct and Silver combined and Luna Care did not show efficacy.

  • Click here to read the report.

Psa control products on Bruno potted plants, December 2014 to January 2015
Field trials on potted Bruno plants further tested the efficacy of a range of potential Psa protectants. At the recommended concentration, Nanospada significantly decreased leaf spotting for up to three weeks post Psa inoculation. When diluted, Nanospada had no significant effect, supporting the use of the recommended rate. Another product, TNL3214, significantly reduced leaf spotting throughout the trial. KOF products only provided control when combined with Streptomycin. 

  • Click here to read the report.
Biosecurity News
24 July 2015
Introducing the Biosecurity Steering Group
24 July 2015
KVH and Zespri have established a Kiwifruit Biosecurity Steering Group with a goal of reducing the risk and impact of biosecurity incursions to the kiwifruit industry. Consisting of members from...
Introducing the Biosecurity Steering Group
24 July 2015

KVH and Zespri have established a Kiwifruit Biosecurity Steering Group with a goal of reducing the risk and impact of biosecurity incursions to the kiwifruit industry.

Consisting of members from KVH, Zespri, Plant and Food Research, Scion, Avocados New Zealand and the Ministry for Primary Industries (MPI), the steering group will identify knowledge gaps and prioritise research needs relating to kiwifruit biosecurity threats not yet established in New Zealand.

Associated with the steering group is the newly established Kiwifruit Biosecurity Research Portfolio. The portfolio is funded by the KVH biosecurity levy with matching contributions by Zespri and managed by the Zespri Innovation team.

The Biosecurity Steering Group will prioritise research to meet the following objectives;

  • Develop a greater understanding of the biosecurity threats to the kiwifruit industry;
  • Develop tools to reduce the likelihood of establishment and impact of these biosecurity threats, which includes tools for diagnostics, surveillance, eradication and management;
  • Pathway analysis to understand where gaps may occur in the biosecurity system and take a collaborative approach with the Ministry for Primary Industries to address these.

More information about the new Biosecurity Steering Group will be provided in the next Kiwifruit Journal article.

Biosecurity News
24 July 2015
Brazilian fungal disease high priority for Biosecurity Steering Group
24 July 2015
Ceratocystis fimbriata is a fungal pathogen causing wilt disease in a number of plant species, including kiwifruit where significant impacts have been reported in Brazil in recent years. The...
Brazilian fungal disease high priority for Biosecurity Steering Group
24 July 2015

Ceratocystis fimbriata is a fungal pathogen causing wilt disease in a number of plant species, including kiwifruit where significant impacts have been reported in Brazil in recent years.

The serious potential impacts of Ceratocystis fimbriata and the lack or kiwifruit specific research being done elsewhere makes this a high priority organism for Kiwifruit Biosecurity Research and is on KVH’s Most Unwanted List.

Ceratocystis fimbriata projects within the Kiwifruit Biosecurity Research Portfolio include:

  • Pathogenicity testing of the New Zealand kumara strain of C. fimbriata. Fortunately the results of this project shown that the New Zealand strain is not pathogenic to kiwifruit and therefore our efforts can be focused on keeping new pathogenic strains outside of New Zealand.
  • A comprehensive literature review by an international expert to specifically understand the risks and potential impact of the pathogen to the New Zealand kiwifruit industry. This review has significantly improved our understanding of C. fimbriata.
  • The next project will sequence a number of Ceratocystis strains to develop primers that will advance our ability to keep pathogenic strains out of New Zealand and provide a tool to diagnose infected vines should the pathogen establish.

A Ceratocystis fimbriata fact sheet can be found on the KVH website here.

Biosecurity News
24 July 2015
KiwiNet workshop
24 July 2015
Last week KVH held its second KiwiNet workshop. The aim of the workshop was to bring together KiwiNet coordinators to discuss industry deployment into the Queensland Fruit Fly response earlier this...
KiwiNet workshop
24 July 2015

Last week KVH held its second KiwiNet workshop. The aim of the workshop was to bring together KiwiNet coordinators to discuss industry deployment into the Queensland Fruit Fly response earlier this year, lessons learnt from the response and next steps for developing KiwiNet.

Many attendees were involved in the QFF response in Auckland and overall the deployment of KiwiNet into the QFF response went well and feedback was positive. However, there is always room for improvement so the workshop provided valuable feedback from those involved.

Presentations from the workshop are available below:

R&D News
24 July 2015
R&D reports: Efficacy of Ambitious for controlling Psa on mature Hayward
24 July 2015
Additional research to determine the efficacy of Ambitious for controlling Psa on mature Hayward vines is now available on the R&D section of the KVH website. Ambitious currently holds a limited...
R&D reports: Efficacy of Ambitious for controlling Psa on mature Hayward
24 July 2015

Additional research to determine the efficacy of Ambitious for controlling Psa on mature Hayward vines is now available on the R&D section of the KVH website.

Ambitious currently holds a limited label claim for the control of Psa in kiwifruit. An application to ACVM for a full label claim will be made this season. Work is still needed to better understand the mode of action of this product.

The efficacy of Ambitious 10SL on mature Hayward Vines for controlling Pseudomonas syringae actinidiae, by Fruitfed Supplies
Trials testing the efficacy of Ambitious for controlling Psa on mature Hayward vines showed Ambitious was effective in reducing the severity of leaf spotting and performed similarly to Actigard. Ambitious did not appear to show any efficacy on reducing the levels of bud rot and bud loss.

  • Click here for the report.


Ambitious 10SL efficacy on Psa disease on Hayward kiwifruit 2014-15, by HortEvaluation
Trials at two high inoculum sites in the Bay of Plenty showed application of Ambitious mid-season (between budbreak and flowering) significantly reduced Psa leaf spot on mature Hayward kiwifruit vines. No significant differences in percentage flowers retained, fruit set or reject fruit type were observed between trial and control plots.

  • Click here for the report.
Grower News
24 July 2015
Waikato regional update
24 July 2015
In early July KVH revisited six Waikato orchards (both conventional and organic) to discuss harvest results and also understand how Psa-V had affected growers through the 2014-15 growing...
Waikato regional update
24 July 2015

In early July KVH revisited six Waikato orchards (both conventional and organic) to discuss harvest results and also understand how Psa-V had affected growers through the 2014-15 growing season.

Generally growers reported good harvests with excellent pollination and strong autumn growth, lifting fruit numbers, dry matter and fruit size.

On the Psa-V front, it was acknowledged that challenges are still very much front of mind, particularly on colder and less well-drained areas of orchards, or in areas highly exposed to wind. For some growers, river mists and hail events have added further challenges.

There are still a good number of Waikato blocks in recovery mode as Gold3 grafts develop and young plants replacing Chinensis rootstocks mature.

KVH revisited colder sites where organic Hayward males had severe Psa-V exudate symptoms last spring. Where males were cut back hard to remove infection, regrowth has been excellent. Further pruning rounds to encourage spur growth has resulted in great structure with spurs expected to be very floral for spring 2015. Grafting of older variety males to more Psa-V tolerant varieties continues as a strategy to further reduce site Psa-V risk. Infected female canes within the canopy were being removed during winter pruning.

One of the conventional Hayward sites visited similarly showed the impact of extensive spring infection of males. Previous management of the male vines had failed to focus on height and density reduction, resulting in vigorous and high growth becoming badly affected. An intense spring programme including elicitors, streptomycin and coppers had subsequently been followed. However, the impacts were still seen as many of the leaders remained ring-barked due to the severity of infection. Restructuring of the males was taking place.

KVH also revisited some young organic Gold3 blocks which had significant Psa-V cut-out last spring, sometimes with up to sixty percent of canopy removed.  Stringing had returned these blocks to almost full canopy. To protect this growth, autumn frost-fighting continued through May and early June 2015 as a strategy to reduce risk of frost damage to the young canes. It was thought that autumn frosts in the previous year had provided entry points for Psa-V, leading to spring infection. Observations next spring may help determine the value of this effort.

For the older Gold blocks, new canes continue to be tied in to replace trunks and leaders ring-barked by Psa-V infection (see photo); and where possible, cankered leaders and canes are being pruned out of the canopy as standard practice.

Overall, there appears to be increased use of copper for Psa-V management on organic orchards, with post-harvest and leaf-fall applications recognised as important to reduce the spread of Psa-V through the colder months. Applying copper as soon as possible after pruning is also being emphasised.

Citrox-BioAlexin is being applied across some organic blocks, again to determine whether Psa-V symptoms can be reduced through use of this product.  Organic growers trialling pre-flower girdles on Psa-V affected blocks reported that this practice had definitely reduced flower bud loss, with girdles applied a month out from flowering giving best results. This technique would be used again in 2015.

 

Kiwifruit Vine Health

Suite 3, Level 1, Customhouse Building
314 Maunganui Road, Mount Maunganui
(entrance cnr Totara and Rata Street)
PO Box 4246, Mount Maunganui, 3149
New Zealand

Tel:  0800 665 825
Fax: 07 574 7591

Email: info@kvh.org.nz