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Eighty-seven highbush blueberry and species-introgressed blueberry cultivars were evaluated for fruit firmness in the 1998-2000 growing seasons with a FirmTech I automated firmness tester. Significant differences were observed among cultivars. An average firmness of 136.1 g.mm -1 of deflection (g.mm -1 dfl) was observed across all studied cultivars, and a range of 80.4 g.mm -1 dfl (Herbert') to 189.0 g.mm -1 dfl ('Pearl River'). Species ancestry was not consistently related to firmness; however, cultivars with higher firmness values often possessed a higher percentage of Vaccinium darrowi Camp and V. ashei Reade ancestry. Conversely, cultivars with softer than average fruit often possessed a higher percentage of lowbush (V. angustifolium Ait.) ancestry. This information may help to identify sources of breeding material for increased firmness in highbush blueberry hybrids.

A Survey of Fruit Firmness in Highbush Blueberry and Species-introgressed Blueberry Cultivars