Pollination and seed-setting in diploid and tetraploid red clover (Trifolium pratense L.) under Danish conditions. 1. Seed-setting in relation to the number and type of pollinating insects. 2. Studies of floret morphology in relation to the working speed of honey- and bumble-bees (Hymenoptera : Apo-idae
Dennis, B.A.; Haas, H.
Arsskr. K. Vet.-Landbohosk, 93-117, 118-33. Bibl. 36 and 30
The total number of bees visiting diploid and corresponding tetraploid red clover plots differed little. Bumble-bees were more frequent on the tetraploid plots than on the diploid, and in a cool, wet summer were considered of major importance as pollinators of tetraploid red clover. Nectar-collecting honey- and bumble-bee numbers were considerably higher than those of pollen-collectors in both diploid and tetraploid red clover.