Oviposition on an artificial substrate by the banded sunflower moth Cochylis hospes Walsingham was examined in response to sunflower pollen (Helianthus annuus) and sunflower pollen extract. Sunflower pollen in quantities as small as 0.2 mg significantly reduced oviposition on an artificial substrate relative to a control without pollen. Aqueous pollen extract applied to the artificial substrate significantly reduced oviposition with respect to the control substrate that was treated with solvent. Banded sunflower moths have gained some reproductive or competitive advantage by ovipositing on the bracts of sunflower and a deterrent effect of pollen could, at least in part, have had functional significance in the development of a behavioral preference for the bracts of the sunflower head as an oviposition site.
Barker, John F. and Grugel, Sharon
"Oviposition by the Banded Sunflower Moth, Cochylis Hospes (Lepidoptera: Cochylidae) in Response to Helianthus Annuus Pollen,"
The Great Lakes Entomologist, vol 29
Available at: https://scholar.valpo.edu/tgle/vol29/iss2/3