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Difference in potential attractiveness to bees of seventeen South African sunflower (Helianthus annuus) cultivars



Difference in potential attractiveness to bees of seventeen South African sunflower (Helianthus annuus) cultivars



The Sixth International Symposium on Pollination, Tilburg, Netherlands, 27-31 August 1990: 288-293



The sugar value, determined by nectar volume and percentage sugar solids in the nectar, of 17 South African sunflower (Helianthus annuus) cultivars was significantly different. Significant differences in corolla length were also measured between cultivars; honeybees (Apis mellifera scutellata) were unable to reach all the nectar in certain cultivars. Nectar was inaccessible to short-tongued bees (Halictidae). Pigmentation of the corolla tube did not differ significantly.

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