By Todd Cavins, Steve Marek and Sophia Kamenidou

Todd Cavins is technical specialist, Sun Gro Horticulture, (405) 533-3751; toddc@sungro.com. Steve Marek is associate professor and Sophia Kamenidou is postdoctoral fellow, Oklahoma State University, Department of Plant Pathology and Entomology, (405) 744-5527; stephen.marek@okstate.edu.