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R&D News
30 November 2016
PhD student probes Psa research
30 November 2016
Over the past three months, KVH has hosted British PhD student, Stuart Woodcock (pictured) from the John Innes Centre in England. Stuart has been in New Zealand undertaking a review of the research...
PhD student probes Psa research
30 November 2016

Over the past three months, KVH has hosted British PhD student, Stuart Woodcock (pictured) from the John Innes Centre in England. Stuart has been in New Zealand undertaking a review of the research and development surrounding Psa during an internship as part of his PhD, which involves researching pseudomonas bacteria, particularly Psa and its ability to cause infection within plants.   

Psa has been estimated to have cost over $1 billion to the New Zealand kiwifruit industry since 2010. Although productivity has recovered, Psa remains a prevalent threat as the majority of orchards harbour the bacteria, with only one kiwifruit growing region has yet to exhibit infection. 
 
More recently, the use of other biological organisms to control Psa have also been trialled and included into a control programme. All these products are effective to various extents, but it has been found that some samples of Psa has developed low level resistance to some of the controls, which could potentially make them ineffective.
 
Working with representatives from KVH, Zespri, Plant and Food Research and growers, Stuart has reviewed past and ongoing research addressing the threat of Psa to New Zealand kiwifruit. He has also identified areas where research needs to be strengthened and highlighted new and novel areas which may be beneficial in combatting Psa.
 
Stuart said his time in New Zealand has proven to be extremely valuable in his studies and continual learning development.
 
“It has been great to get out and about in various parts of the country to see how orchards are managing Psa and talking to orchardists about their control methods,” he said.
 
“I’ve been working closely with KVH and Zespri over the past few months to really get into the complexities of Psa and I hope my review will be useful in the continued management of this invasive infection.”
 
KVH Chief Executive, Barry O’Neil, said he was looking forward to further investigating the findings of the review.
 
“It has been fantastic to have someone with Stuart’s depth of knowledge working with us at KVH. He has identified some key areas of past research which can look to be strengthened in time and also highlighted some innovative ways which could potentially help with the ongoing Psa management.”
 
“Stuart’s review is part of the continuing research and development KVH delivers annually in collaboration with Zespri,” he said.
 
 
R&D News
25 August 2016
New research highlights value of wound protectants
25 August 2016
Research trials, designed to test if wound protectants could provide effective protection against infection by Psa after pruning, have shown copper paste and InocBloc paste consistently protected...
New research highlights value of wound protectants
25 August 2016
Research trials, designed to test if wound protectants could provide effective protection against infection by Psa after pruning, have shown copper paste and InocBloc paste consistently protected wounds in both potted plant trials and in Chieftain male vines in the field. These treatments, applied immediately after pruning, provided significant wound protection in both winter and spring. 
 
The research also showed that where wound protectants were not applied, the incidence of Chieftain kiwifruit canes naturally infected by Psa in winter increased from 3.3% to 50% in the two weeks after wounding. In spring, the incidence increased from 30% to 72%. This supports messages to apply effective wound protectants immediately after pruning to reduce infection of vines in the field.
 
InocBloc paste is a pine based product. It is listed in the Zespri crop protection standard and is in the process of registration with BioGro. Organic growers interested in using this product must obtain approval prior to use and should contact their BioGro auditor or the BioGro office.
 
Click here for the research 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.
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.
R&D News
9 July 2015
R&D report on KVH website - Autumn spraying for protection of Psa-V
9 July 2015
This trial was established to determine the effects of an intensive autumn spray protection programme on Gold3 and Hort16A. It was difficult to separate treatment effects as the Gold3 site had little...
R&D report on KVH website - Autumn spraying for protection of Psa-V
9 July 2015

This trial was established to determine the effects of an intensive autumn spray protection programme on Gold3 and Hort16A. It was difficult to separate treatment effects as the Gold3 site had little infection and the Hort16A site had too much infection. There was a trend for treatment programmes including a full programme with coppers, foliar applied elicitors and KeyStrepto™ to reduce the effects of Psa-V by comparison with other lesser treatment programmes.

Click here to view the report.

R&D News
25 June 2015
Bi-monthly R&D update report - April/May 2015
25 June 2015
This bi-monthly report provides information about the progress over April and May 2015 for the Psa R&D programme. The following projects are summarised in the report: Survival of...
Bi-monthly R&D update report - April/May 2015
25 June 2015

This bi-monthly report provides information about the progress over April and May 2015 for the Psa R&D programme. The following projects are summarised in the report:

  • Survival of Pseudomonas syringae pv. actinidiae on plastics coated with or containing an antimicrobial compound.
  • Best practice for protectant spray coverage of spring and summer kiwifruit canopies

Click here to read the report.

Lara Harrison, KVH Communications

R&D News
25 June 2015
New R&D report - best practice for protectant spray coverage of spring and summer kiwifruit canopies
25 June 2015
Optimising copper use for sustainable control of Psa in kiwifruit orchards—this study was undertaken to build on previous work to develop best practice recommendations for protective sprays for...
New R&D report - best practice for protectant spray coverage of spring and summer kiwifruit canopies
25 June 2015

Optimising copper use for sustainable control of Psa in kiwifruit orchards—this study was undertaken to build on previous work to develop best practice recommendations for protective sprays for kiwifruit. In particular, it was to determine (1) for how long low-drift air inclusion AI nozzles could efficiently deliver protectant sprays to expanding spring canopies; and (2) to maximise the efficiency of spray delivery to flowering Hayward and fully expanded Gold3 canopies on wide row spacings.

Click here to read the report.

Lara Harrison, KVH Communications

R&D News
11 June 2015
New R&D report - quality testing of compost samples
11 June 2015
A trial was undertaken by Kawerau-based Plateau Bark to see if compost could be made using reject fruit (and associated debris) mixed with pulp waste from the Norske Skog Tasman Ltd pulp and paper...
New R&D report - quality testing of compost samples
11 June 2015

A trial was undertaken by Kawerau-based Plateau Bark to see if compost could be made using reject fruit (and associated debris) mixed with pulp waste from the Norske Skog Tasman Ltd pulp and paper mill.

The compost tested 'not detected' for Psa-V and kiwifruit seed was destroyed during the composting process.

John Mather, KVH Biosecurity

R&D News
14 May 2015
Compost using reject kiwifruit
14 May 2015
KVH has recently received a Plant and Food Research report about the trial of manufacturing compost using reject kiwifruit (and associated debris) mixed with wood pulp. The report found the compost...
Compost using reject kiwifruit
14 May 2015

KVH has recently received a Plant and Food Research report about the trial of manufacturing compost using reject kiwifruit (and associated debris) mixed with wood pulp.

The report found the compost tested ‘not-detected’ for Psa-V and that kiwifruit seed was destroyed during the composting process. 

The Kawerau-based manufacturer is seeking to ramp up production of compost using reject kiwifruit, and to sell the product to primary producers, including kiwifruit orchardists, in the Bay of Plenty. 

KVH has amended its protocols around movement of compost containing kiwifruit material so an approval can be given to compost manufacturers on a case by case basis, as long as the product meets criteria including Psa-V not-detected and kiwifruit seed destruction. 

KVH and the Bay of Plenty Regional Council have been supportive of this research as increasing quantities of reject fruit for composting will likely reduce the amount of fruit available to birds resulting in further wild kiwifruit populations.  There is thought to be about 60,000 tonnes of reject fruit produced from Bay of Plenty post-harvest companies.

KVH has received numerous enquiries from compost suppliers in the last month.  KVH is continuing to work with Zespri’s OPC to develop a KiwiTech Bulletin providing guidance around suitable compost compositions and distribution protocols.

John Mather, KVH Biosecurity

R&D News
30 April 2015
Bi-monthly R&D update report: February/March update
30 April 2015
This bi-monthly report provides information about the progress over February and March 2015 for the Psa R&D programme. The following projects are summarised in the report: Elicitor potted...
Bi-monthly R&D update report: February/March update
30 April 2015

This bi-monthly report provides information about the progress over February and March 2015 for the Psa R&D programme. The following projects are summarised in the report:

  • Elicitor potted plant trial
  • Glasshouse trials
  • Green bud rot trial
  • Autumn spraying for protection from Psa (Gold kiwifruit)
  • Bud rot in Hayward and Green14

Click here to read the report.

Lara Harrison, KVH Communications

R&D News
2 April 2015
Compost trial using reject kiwifruit
2 April 2015
KVH has been working with the Bay of Plenty Regional Council to reduce the amount of wild kiwifruit establishing in the Bay of Plenty’s gullies, bush margins and production forests. ...
Compost trial using reject kiwifruit
2 April 2015

KVH has been working with the Bay of Plenty Regional Council to reduce the amount of wild kiwifruit establishing in the Bay of Plenty’s gullies, bush margins and production forests. 

Wild kiwifruit is an environmentally damaging vine and may harbour Psa-V or other pests, which can then spread to nearby orchards.  Reject fruit fed to livestock may be a potential seed-source of further wild vines, establishing when birds such as waxeyes feed on the softening fruit and distribute the seed.

A trial was undertaken by Kawerau-based Plateau Bark to see if compost could be made using reject fruit (and associated debris) mixed with pulp waste from the Norske Skog Tasman Ltd pulp and paper mill.  The composted material was regularly turned and monitored.  The trial was overseen by Plant and Food Research. 

Temperatures within the compost piles were logged and found to be regularly above 60 degrees Celcius. Testing confirmed the end product was Psa-V ‘not-detected’ and kiwifruit seed had been destroyed during the high-temperature composting process.

KVH is now advancing the process to name Plateau Bark as a KVH-approved compost manufacturer using reject kiwifruit.  Ongoing approval will depend on the compost product being consistently manufactured to prescribed standards, regularly monitored and free of Psa-V, other harmful pathogens and viable kiwifruit seed. 

The relevant KVH Protocols will be amended to allow KVH-approved compost manufacturers to spread compost containing reject fruit, made to prescribed standards, onto Psa-V positive orchards in Recovery Regions.

For more information on this project, contact John Mather or Karyn Lowry at KVH on 0800 665 825.
 

R&D News
19 March 2015
Improved R&D website now live
19 March 2015
KVH has made some improvements to the R&D section of the website to make it much more user-friendly. Growers still need to be logged in to view the full R&D section. The main changes: ...
Improved R&D website now live
19 March 2015

KVH has made some improvements to the R&D section of the website to make it much more user-friendly. Growers still need to be logged in to view the full R&D section.

The main changes:

Let us know your feedback on the new site – email KVH

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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