Queensland high-density planting system trials for new scab-resistant apples

March 2010 | Simon Middleton | Future Orchards® notes

This resource reports on Queensland high-density planting-system trials established to evaluate new scab-resistant apple material under commercial-style orchard conditions. The work formed part of a wider Australian program assessing selections including RS103-130, later commercialised as Kalei®.

The trials considered more than disease resistance alone. Tree performance, planting density, canopy management, light interception, fruit quality and the suitability of the selections for intensive orchard systems all contributed to the assessment.

The resource demonstrates why a new variety cannot be judged only by its genetic resistance to scab: it must also fit a productive orchard system, deliver acceptable fruit quality and respond predictably to management.

For growers, the notes provide historical context for the development of scab-resistant varieties and show how orchard-system trials are used to move promising material from breeding programs toward commercial production.

The wider project also assessed consumer and post-harvest performance of the breeding material, illustrating the multi-stage process required before a disease-resistant selection can become a commercially credible orchard variety.