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Tolerance to Terbacil in Rabbiteye Blueberry


Several plants in a Vaccinium ashei Reade collection were tolerant of terbacil. To determine whether the tolerance is heritable, progeny of crosses between a selection from these plants and 3 rabbiteye blueberry cultivars were compared with progeny of 3 rabbiteye × rabbiteye cultivar crosses. Significantly less leaf damage by terbacil occurred in offspring of the selection than in those of rabbiteye cultivars. Tolerance to terbacil appeared heritable, suggesting that the tolerant plants constitute usable germplasm for a breeding program. Chemical names used: 5-chloro-3-(1, 1-dimethylethyl)-6-methyl-2, 4(1H, 3H)-pyrimidinedione (terbacil).