Comparison of IAD and starch-iodine indices at harvest and how they relate to post-storage firmness retention in Ambrosia™ apples over three growing seasons

Starch-iodine index and I-AD values were recorded for Ambrosia (TM) apples at harvest and compared with firmness retention after controlled atmosphere storage. The starch-iodine index correlated with firmness retention only in 2012. Harvest I-AD values were associated with firmness retention in all years. Seasonal differences in temperature patterns were possible factors affecting the starch-iodine index. I-AD was more consistent between seasons for monitoring maturity.