Enhancement of a naturally occurring parasitoid and commercially formulated entomopathogenic nematodes were examined to determine effects of suppression on adult cucumber beetles in pumpkins in 2003 and 2004. Striped cucumber beetles were collected from farms in Ohio to assess the consistency of parasitism by Celatoria setosa. The mean percent parasitism was found to be 14% in July and August with a range from 1 to 38%. Floral resource enhancement experiments were conducted in the field to compare percent parasitism of beetles in plots of pumpkins with a flowering borders of purple tansy and nasturtiums, Phacelia tanacetifolia and Tropaeolum majus, with plots without flowering borders. For evaluation of nematodes, laboratory bioassays were conducted to evaluate to the susceptibility of adult striped cucumber beetles to entomopathogenic nematode Heterorhabditis bacteriophora strain GPS-11. Percent mortality of beetles treated with GPS-11 resulted in 56% and 58% compared to a water only treatment of 3% and 16%, respectively. Three commercially available nematodes were compared in laboratory bioassays to determine the strain to which striped cucumber beetles were most susceptible. Field experiments were performed to compare biweekly foliar application of the most effective nematode to foliar sprays of carbaryl.