Psa Case Studies
This page has case study information from the field about Psa observations.
Lessons learned from Psa-V incursions to new regions (Waikato, Hawke's Bay, Gisborne, Coromandel and Kerikeri) in 2012. Observations and case studies provided information on the spread of the bacteria within these regions and built understanding about the patterns of infection and expression of the disease.
Pathway assessment tracing Psa-V entry and spread in Te Awamutu, Karapiro and Paeroa.
On 20 August 2012, KVH was notified of a positive Psa-V result in Te Awamutu in the South Waikato region. A second neighbouring orchard was confirmed positive the next day. At the first notification of a positive result, KVH senior technical staff visited the affected orchard to confirm symptoms. KVH initiated a pathway assessment into the Waikato region incursions.
To help the industry better understand management and cultural practices to control Psa-V, a comparison between Psa-V in kiwifruit and other bacterial diseases in the stonefruit and citrus industries was prepared by KVH.
KVH conducted a field summary on the performance of two non-Zespri variety A19 orchards (Enza Gold), in a Psa-V environment.
A19 (Enza Gold) case study (16.08.12)
KVH conducted a case study about 57 Hort16A Te Puke KPINS confirmed Psa-V positive in 2011. Only six of these KPINS made it to the 2012 harvest, highlighting how few were able to achieve a crop.
The case study includes a video interview with Te Puke growers Barry Roderick, Ken Edkins and Robbie Ellison.
Hort16A case study (03.08.12)
Following the first notification of a positive Psa-V result on an orchard in Franklin (South Auckland) KVH initiated a routine traceback investigation involving assessing known pathways for the wider-spread of Psa-V into new regions.
Franklin Psa-V trace-back report (10.05.12)
Routine orchard monitoring is essential for early Psa-V detection. This case study interview by KVH highlights the importance of orchard observation, preparedness and protectant programmes.
Click here to read the article published in Kiwifruit Journal, Psa Scientific Edition, March/April 2012.
In early August 2011 KVH investigated 35 orchards in the Te Puke region to determine why some orchards showed more severe levels of Psa-V infection than others. Strung canopies appeared to be a common factor amongst the most severely affected orchards.
Wild Fire Orchards report (September 2011).