Year: 1983
Type: article
Abstract: Calyx green end disorder (GED) of ‘Golden Delicious’ apple ( Malus domestica Borkh.) is a sublethal fruit disorder characterized by a flattening distortion of the calyx lobes and a persistent green coloring of the skin at the calyx end of mature fruit. The severity of the symptom varied from mild skin greening to necrosis and was subjectively evaluated on a scale of one to 5. Fluoride applied as ammonium fluoride to spur leaves, fruit, the whole canopy, and via xylem caused symptoms identical to those in an untreated commercial orchard with a serious GED problem. Increasing severity of GED up to a rating of 3 was associated with increased levels of F in cortical calyx fruit tissue (r = 0.93). In the commercial orchard, the incidence of GED was associated with elevated levels of soil- and air-borne F. Season-long calcium chloride sprays were not effective in reducing GED, but weekly overhead irrigation rinsing treatments did significantly reduce GED severity. Gibberellins A 4 + 7 (GA 4 + 7 ) plus 6-benzylamino purine (BA) applied at bloom also reduced severity of GED but, in combination with irrigation rinsing, was no more effective than rinsing alone.
Authors: Bruce H. Barritt, R. Kammereck
Institution: Washington State University
Language: English
Subfield: Plant Science
Domain: Life Sciences
SDG: Zero hunger
Open Access status: hybrid
Estimated APC paid: $3,500
OpenAlex ID: W4289843642