Evaluating Strawberry Breeding Selections for Field and Postharvest Fruit Decay

Fruit from the annual replicated yield assessments for the USDA-ARS strawberry (Fragaria x ananassa Duchesne ex Rozier) breeding program at Beltsville, MD in 2010 were evaluated for postharvest decay development after storage at 5 degrees C. A statistically significant correlation between percentage decay of fruit in the field and percentage decay of fruit from post-harvest evaluation was observed when data were analyzed on a genotypic mean basis (r = 0.37) or a field plot basis (r = 0.25) across all harvests. Analysis of the same data on a plot by harvest combination basis resulted in a statistically significant correlation for only one harvest date. While significant, the level of correlation on a genotypic mean basis is not strong enough to dismiss the need for post-harvest evaluation. The percentage postharvest decay increased over harvests, while the percentage decay at harvest, in the field, did not. Weather data from 2010 indicated that field conditions just a few days before harvest can affect percentage decay at harvest differently than percentage decay in postharvest storage; rain events were correlated with increased percentage decay in the field but not postharvest decay, while dry air was correlated with decreased percentage decay postharvest but not decay in the field. These findings suggest that, in some environments, conditions after flowering can have a more significant role in the fruit decay than previously has been reported.