Harvest guidelines

Annual report 2012 Page_08_Image_0002-webKORU® Plumac c.v. harvests over a 21 day period and is a 3-4 pick variety in New Zealand.

The first pick in the Nelson region of New Zealand ranges between March 10-14. As a guide, the first pick is just before Jazz™ (Scifresh).

See here for maturity parameters and colour chart guidelines such as starch pattern, pressures and brix...

Maturity Parameters:

Maturity parameters have been developed over several years by Fruition Horticulture, with testing throughout both the Nelson and Hawkes Bay Regions of New Zealand. Current recommendations for commencement of harvest are as follows:

  • Starch pattern index of 3.0 on the 0-7 SPI scale, with 2.5 acceptable if other parameters advancing and foreground colour >4.
  • Pressures accepted down to 7.5kg, but 7.5-8.0 should be sold first.
  • Brix Soluble Solids of greater than 12.0, but fruit is better at >13.0.   

Colour Charts:

Harvesting and packing fruit with the proper colour and maturity ensures consistent characteristics in the apple to provide the consumer with a good eating experience every time, and return sales at a high value. 
The following colour charts were prepared by Fruition Horticulture and are suggested guidelines for background and foreground colours in harvesting of KORU® Plumac c.v.  

KORU® Plumac c.v. background colour chart:
For Class I fruit the background colour should be in the 3-5 range (6 for final pick or immediate sale fruit)

Annual report 2012 Page_08_Image_0001-web

KORU® Plumac c.v. foreground colour chart:
For Class I fruit the foreground colour should be in the 4-6 range

Annual report 2012 Page_08_Image_0002-web

Please note:  
Colour may vary when viewing colour charts online or when printed.  
Use only official KORU® Plumac c.v. colour charts for harvest decisions.

Colour Chart photography by K Vincent Photography
Copyright of McGrath Nurseries Ltd