Performance of Advance Gold budbreak enhancer on Gold3 kiwifruit in cold and warm seasons
Advance Gold (AG) is a new agricultural compounds & veterinary medicines (ACVM)-registered budbreak enhancer for Gold3 kiwifruit. It contains salicylic acid as the active ingredient, and is used in conjunction with nitrogen and calcium salts. Gold3 kiwifruit blocks in the Bay of Plenty up to 1 ha in area were sprayed using convention air blast sprayers fitted with air inclusion nozzles in August of 2015 and 2016, and monitored for budbreak, flowering and components of yield. Following good winter chill in 2015, a block at near sea level produced about 2 king flowers per winter bud (KF/WB) without AG treatment and about 3 KF/WB following AG treatment. A site at 93 m above sea level produced a larger number of flowers unassisted and a modest increase following AG treatment. Minimal winter chill in 2016 resulted in very low flower numbers in untreated canes at both sites, with AG treatment producing an increase of approximately 1 KF/WB. The current budbreaker used by the kiwifruit industry, hydrogen cyanamide, produced comparable increases in flower numbers to AG in the four trials but gave a larger proportion of “star triples”, tightly clustered triple flowers. Components of yield are presented.