Reading Apple Colour Break Before You Set a Pick Date | Field Notes
Colour change is a visible signal, but sugar-acid balance tells you whether the bin you pick this week will still be saleable in month two of storage.
Orchard managers around Jecheon often call us when half the block shows red striping but fruit on the north slope still looks a week behind. Colour break is a scheduling hint, not a harvest order.
Sample trees, not row averages
Walk diagonally across the block and mark three trees at low, mid, and upper elevation. Slice one fruit from each, note flesh firmness, and record the date. We use that triangle to estimate how many days separate the first pickable bin from the last.
Storage changes the target
If your cold room runs at 0 °C with controlled atmosphere, you can accept slightly lower brix at picking than if fruit goes straight to a wholesale market within five days. Tell us your sales channel when booking a harvest timeline report.
Heat compression in September
Two consecutive days above 33 °C can advance maturity on exposed rows by 48 hours. Note those dates in your orchard log; we adjust the picking calendar forward for affected blocks only.