In recent years, bacterial infection of creeping bentgrass (Agrostis stolonifera) by the pathogen Acidovorax avenae has become problematic at what are typically "tournament-level" golf courses.  The pathogen can casue etiolation and in some instances necrosis.  A. avenae is a gram-negative, biotroph.  Anecdotal evidence suggests that this pathogen is associated with turfgrass stress and high heat conditions.  There is also evidence that A. avenae is capable of producing gibberellic acid and auxin, two plant hormones that are associated with etiolation.  Antiobiotic use on golf courses is restricted, therefore other solutions need to be found.  Based on the existing evidence an experiment was designed to evaluate the ability of several common turfgrass products to prevent A. avenae infection.  the plant growth regulators trinexapac-ethyl, paclobutrazol, and prohexadione calcium are all gibberellin sysnthesis inhibitors and were included as treatments.  As the bacterium is considered a biotroph, it is possible that the plant defense mechanisms are regulated by salicylic acid and thus chlorothalonil plus acibenzsolar-S-methyl was also inclued.  Addition treatments include chlorothanonil, seaweed extract, Bacillus subtilis, and aluminum tris.  The trial plots are to be inoculated with the bacterium.   No results at time of submission.