1-aminocyclopropane carboxylic acid shows promise as a chemical thinner for apple

James R. Schupp, Thomas M. Kon, H. Edwin Winzeler

Research output: Contribution to journalArticlepeer-review

26 Scopus citations


The objective of these studies was to evaluate the efficacy of several concentrations of 1-aminocyclopropane carboxylic acid (ACC) for thinning apple at the standard growth stage for chemical thinning timing and a late thinning growth stage. ACC was applied at concentrations of 0, 100, 300, or 500 mg·LL-1 to 'Golden Delicious'/Bud.9 apple trees at 10 mm or 20 mm fruit diameter. Treatments were applied to the point of drip to individual whole trees in a completely randomized design with five (2010) and six (2011) replications. When ACC was applied at 20 mm, there was a linear dose relationship between concentration and fruit thinning in both years. ACC was ineffective at 10 mm. The naturally occurring compound ACC shows potential for use as a reliable late chemical thinner for apple.

Original languageEnglish (US)
Pages (from-to)1308-1311
Number of pages4
Issue number9
StatePublished - 2012

All Science Journal Classification (ASJC) codes

  • Horticulture


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