Effects of Plant Growth Regulator Treatments on Bitter Pit and Russet Development in Golden Delicious Apple

Atay A. N. , Koyuncu F.

JOURNAL OF AGRICULTURAL SCIENCES-TARIM BILIMLERI DERGISI, vol.21, no.4, pp.516-524, 2015 (Peer-Reviewed Journal) identifier identifier

  • Publication Type: Article / Article
  • Volume: 21 Issue: 4
  • Publication Date: 2015
  • Journal Indexes: Science Citation Index Expanded, Scopus, TR DİZİN (ULAKBİM)
  • Page Numbers: pp.516-524


Development of russet and bitter pit on apple fruits causes serious loss of quality and a decrease of commercial value. In this study, effects of GA(4+7), GA(3), ProCa and ethephon treatments on russet and bitter pit incidence in Golden Delicious cultivar grafted on M9 rootstock was determined. The same treatments were applied to the same experimental trees between 2010 and 2012. Russet and bitter pit severity in the fruits was evaluated based on the scale values as well as a percentage after harvest. GA(4+7) treatment was very effective on controlling russet formation that russeting was very low as 1.07, 1.11 and 1.11 in 2010, 2011 and 2012, respectively. The rate of rusty fruit was between 6.7% and 11.1% in GA(4+7), and between 44.4% and 93.3% in the control. GA(3) treatment gave successful results in reduction of russet as GA(4+7). However, higher doses of GA(4+7) may increase the formation of bitter pit especially in the years with low crop load. ProCa and ethephon treatments had no effect on russet and bitter pit development.