Cornell starch-iodine scale 1–8
Call the harvest with numbers, not guesswork.
Rate every apple in the sample set, get instant averages for starch, pressure, size, brix and weight, snap a photo of the cut fruit, and pin exactly where the sample came from.
Per-apple entry, live averages
One row per apple. Toggle on pressure, size, brix and weight; every column averages as you type.
Photo of the sample set
Capture the iodine-stained cut faces straight from your phone and keep it with the record.
Mapped sample locations
Tap the map or use GPS to mark the block, then see every test you've taken across the orchard.
The scale, at a glance
- 1No clearingFull black stain — very immature
- 2Clearing at coreImmature
- 3Core clearPre-harvest
- 4Clearing outwardApproaching harvest
- 5Half clearLong-term storage window
- 6Mostly clearShort-term storage / fresh market
- 7Slight stainingImmediate market
- 8Fully clearOver-mature