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Advancing hull maturity of Australian walnuts

journal contribution
posted on 2023-05-21, 20:49 authored by Lang, MD, Katherine EvansKatherine Evans
The quality of walnuts is influenced by the time between hull and kernel maturity; however, knowledge of this timing and factors which affect nut quality in Australia require further investigation. In this study, the timing of hull and kernel maturity occurred earlier in the warm climate of NSW than in cool climate Tasmania. Asynchrony in the timing of kernel and hull maturity in Lara and Vina was evident in both regions, but less so for Mna in Tasmania. Foliar application of ethephon significantly increased hull dehiscence in comparison to nontreatment with nearly all Chandler fruit hullable within 8 days of treatment with 432 g/ha of ethephon. Similarly, nearly all Lara fruit and 90%o of Serr fruit were hullabie, after 10 and 14 days respectively, with ethephon treatment at 756 g/ha. Ethephon was not considered to be detrimental to the health of trees with less than 5oh of leaves within tree canopies yellowing prematurely. Further research is required in Australia to improve this initial description of temporal development of fruit maturity and to confirm the efficacy of ethephon in a greater range of cultivars and environmental conditions.

Funding

Horticulture Innovation Australia

History

Publication title

Australian Nutgrower

Volume

24

Issue

4

Pagination

14-17

ISSN

0819-7849

Department/School

Tasmanian Institute of Agriculture (TIA)

Publisher

Australian Nut Industry Council (ANIC)

Place of publication

Berri, South Australia

Rights statement

Copyright 2010 Australian Nut Industry Council

Repository Status

  • Restricted

Socio-economic Objectives

Tree nuts (excl. almonds and macadamias)

Usage metrics

    University Of Tasmania

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