Quantifying key parameters as elicitors for alternate fruit bearing in cv. 'Elstar' apple trees

Orchard plot of yields of consecutive 210 cv. 'Elstar' trees (x axis) in three rows (y axis) in 2010 (top) and in 2009 (bottom) showing alternate bearing in fruit trees and random distribution of biotic bearing within the same row; colours indicate yield ranges from 0 to 10 (red-orange), 10 to 15 (yellow), 15 to 20 (green) and >20 kg/tree (blue).