Pollination of Parsley (Petroselinum Crispum) Grown for Seed

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Abstract
Syrphids (order Diptera, family Syrphidae) were numerically the dominant visitors on umbels of flowering parsley. Honeybees were the next most numerous, and their numbers increased throughout the bloom period, while the syrphids showed a large population decline prior to mid-bloom. Seed yields were nearly 3 times as great with open pollination as when pollinators were excluded from the flowers. Seed set, an expression of pollinating activity, was maximum during weeks 2, 3, 4 of a 5-week bloom period.

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