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The extent of self-fertility and self-fruitfulness was studied in  Vaccinium arboreum  Marsh,  V. darrowi  Camp, and in seedlings, termed MIKs, from open-pollination of  V. darrowi  (section Cyanococcus) ×  V. arboreum  (section Batodendron) F 1  hybrids. The open pollinations that produced the MIKs occurred in a field containing tetraploid southern highbush selections (based largely on  V. corymbosum  L.), and the pollen parents of the MIKs are believed to be southern highbush selections. The MIKs that were studied had been selected for high fruit set after open pollination in the field. Both  V. arboreum  and  V. darrowi  exhibited very low self-fruitfulness and self-fertility when hand-pollinated in a greenhouse; the former produced no seedlings from more than 600 selfed flowers, and the latter produced only 13. By contrast, southern highbush clones averaged 70 seedlings per 100 pollinated flowers when selfed and 230 when crossed. Self-fertility and self-fruitfulness of the MIKs were higher than those of  V. arboreum  and  V. darrowi  but lower than those of southern highbush selections. MIK × MIK crosses gave fewer seedlings per 100 pollinated flowers (84) than highbush × highbush crosses (230), probably reflecting their hybrid ancestry. Although introduction of  V. arboreum  genes into southern highbush blueberry gives plants of excellent vigor and adaptation to north Florida, several generations of breeding will be needed to obtain cultivars with high fertility and berry quality.

Level of Self- and Cross-fertility of Derivatives of Vaccinium arboreum × Vaccinium Section Cyanococcus Hybrids