A four-year study examined the degree of self-pollination and self-fertility in the following cultivars of Ribes nigrum L.: Ben Alder, Ben Lomond, Ben Nevis, Ben Tirran, Ceres, Ojebyn, Titania and Triton. The percentage of flowers setting fruit largely depended on the cultivar and on the pollination treatment. The most fruits (over 60%) were obtained in free-pollination conditions; 44-64% fruit set occurred when flowers were pollinated with their own pollen, and ~20% after self-pollination. In cultivars Ojebyn, Ben Nevis, Ben Lomond, Ben Alder, Ben Tirran and Triton, which are largely self-fertile, there was no significant difference in fruit set between own pollen and free pollination. Cultivars Ceres and Titania had the lowest degree of self-fertility (~44%). Flowers of Ben Lomond were most capable of self-pollination (~45%). All cultivars examined require pollinating insects during flowering for satisfactory yield.
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