Abstract
Six native sunflower, Helianthus , species were evaluated for resistance to the banded sunflower moth, Cochylis hospes Walsingham, a pest of cultivated sunflower in the northern Great Plains. Larval survival and oviposition preference by female C. hospes on the capitula (heads) of the native sunflowers H. annuus L., H. petiolaris Nuttall, H. maximiliani Schrader, H. tuberosus L., H. pauciflorus Nuttall ssp. subrhomboideus (Rydberg) Spring & Schilling, and H. nuttallii ssp. rydbergii (Britton) Long were evaluated in the field and laboratory, respectively. Larval development occurred on the capitula of all sunflowerspecies tested. Larval survival was higher on H. annuus than on any other species. The lowest larval survival, based on the percentage of capitula infested, occurred on H. maximiliani , H. pauciflorus , and H. tuberosus . More eggs were laid on the capitula of H. annuus than on other species in multiple-choice trials. In 2-choice tests, H. tuberosus received significantly fewer eggs than H. annuus . Both larval antibiosis and oviposition antixenosis resistance were evident in the perennial sunflower species H. pauciflorus , H. tuberosus , and H. maximiliani . Incorporating germplasm from these species into commercial hybrids could be helpful in reducing costs for the control of the banded sunflower moth.
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