Effects of alternatives to hydrogen cyanamide on commercial 'Hayward' kiwifruit production
The restriction of hydrogen cyanamide (HC) for dormancy interruption of kiwifruit in the European Union leads to a concern among many New Zealand growers about how long the product will be available in their market. A completely randomized block experiment in Auckland region compares the performance of two available alternative dormancy breaking treatments of 'Hayward' green kiwifruit (Actinida deliciosa var. deliciosa 'Hayward'); Erger® (ER) and Armobreak® (AB) with HiCane® (HC) and with an untreated control. Bud break and flowering was studied during three years of different winter chill, ranging from 622 h below 7°C of the 2009 winter to only 301 of the 2011 winter. 'Hayward' kiwifruit shows large sensitivity to winter chill variations. The alternatives to HC improved the percentage of budbreak (%BB) and achieved more inflorescences per winter bud (KFl WB-1) after high winter chilling. After medium and mild winter chilling, even though the response compared with the control was always improved, the alternatives of HC were less effective than HC.
Hernández, G. and Craig, R.L. (2016). Effects of alternatives to hydrogen cyanamide on commercial 'Hayward' kiwifruit production. Acta Hortic. 1130, 131-138
Actinida deliciosa, budbreak, flowering, HiCane®, Dormex®, ArmobreakTM, Erger®