KVH continues to work with Zespri and ACVM to confirm label claims and use conditions for KeyStrepto™ and Kasumin® post 15 June 2014. Currently both products cannot be used before 15 June unless a Justified Approval (JA) is issued by Zespri, and only under extenuating circumstances.
Unless we receive confirmation from ACVM as to the use condition, this date is likely to be extended.
KVH will advise growers of progress through the KVH Bulletin.
Psa-V infection has been confirmed in Japan.
The disease was first found last month in the Ehime Prefecture, Japan’s largest kiwifruit production area; and soon after was confirmed in the Southern area of the Fukuoka Prefectural.
Growers in both regions have cut out all infected vines.
The Prefectural Governments together with agricultural officials and advisors are investigating the extent of the spread; and advising growers of best-practice control measures including monitoring for early detection, cutting out infected material and tool sterilisation.
Emergency financial assistance has been offered to kiwifruit growers’ for disease prevention measures.
Coromandel harvest is now complete and most crops have achieved close to their estimate. Growers have been actively applying copper and Actigard™ post-harvest.
Psa-V symptoms have recently increased, particularly in Hort16A and Gold9 orchards. One of the original Psa-V Gold9 sites is described as 95 percent clear of Psa-V symptoms. This follows an aggressive copper programme.
M33 males in a Gold9 orchard are expressing cane and shoot dieback. However M91 males in the same block appear to be clear of symptoms.
Growers are reporting Gold3 as clear of symptoms, except for those that were grafted onto heavily infected rootstock.
Conversion of Hort16A orchards will continue this winter. Some Hort16A growers whose orchards are not showing symptoms will continue for a 2015 crop.
A Coromandel kiwifruit grower recently received an email from California-based company Pollen Technologies, offering to supply kiwifruit pollen for artificial pollination. It appears the pollen is sourced from either the United States or China with samples available upon request.
KVH immediately alerted MPI Imports and Exports Group (plants) of the email and contacted the Californian company to inform them that: importation of any pollen into New Zealand for plant breeding purposes is currently prohibited; the company should not solicit enquires from New Zealand; and to immediately stop all promotion of their pollen products and services in New Zealand.
KVH included information regarding the National Psa-V Risk Management Plan’s rules and risk management around artificial pollination within New Zealand.
MPI also contacted the supplier to confirm pollen imports are strictly prohibited.
The company has confirmed it has not sent pollen to New Zealand and it will abide with KVH requests and not seek orders or offer samples of pollen to New Zealand kiwifruit growers.
If any growers receive any further offers of pollen or samples of pollen from a Californian, Chinese, or any overseas based company, then please alert KVH and MPI immediately. The MPI contact should be made through the MPI exotic pest and disease hotline: 0800 80 99 66.
2014 Zespri / KVH Potted Plant Field Trial Report—Hort16A trial
This trial was established to determine the most effective time to apply Kasumin, at label rate from 14 days prior to, and up to seven days post, a Psa-V infection event. Additionally, a number of other products were tested including a copper product Ag Copp 75 and Nanospada 500. Two seaweed extracts in rotation with copper were also tested to determine if seaweed extracts could reduce phytotoxicity and Psa symptoms.
A number of conclusions were made from this trial:
Click here to read the full report on the KVH website.
On 29 May Kiwifruit Vine Health launched the Kiwifruit Plant Certification Scheme (KPCS) with the release of the Core Standard (the first of two Standards under the scheme).
Nurseries can now join the KPCS and certify kiwifruit plants to the ‘Core’ Standard. (A second ‘High Health’ Standard will be available toward the end of 2014).
This means growers will soon be able to purchase certified kiwifruit plants from participating nurseries, giving them assurance they are investing in the best possible start for their plants. Click here to see a fact sheet for growers on the Scheme.
For more information visit www.kvh.org.nz/kpcs.