Coefficients of correlation between cracking as quantified in the lab using an immersion assay and fruit from grafted trees and as observed in the field using trees on their own roots that were exposed to natural rain.

Fruit cracking in the lab was quantified using the cracking index (‘CI’), the time to half maximum cracking (‘T50’) and the percentage of fruit that cracked at infinity (‘asymptote’). Cracking in the field was assessed as the percentage of fruit that cracked in the proximal stem cavity, the equatorial region of cheek and suture and the distal stylar end cracking, the mean cracking, the maximum and the predicted cracking percentage. For details see text.