Field reports indicate that the Rps-1k gene of Phytophthora resistance is no longer as effective as it was few years ago. We plan to conduct a survey to determine what Phytophthora races defeat the Rps-1k gene in Iowa. The first step of this survey is to collect Phytophthora-infected plants. If you have damping-off or plants suspected to be infected by Phytophthora and would like to know whether disease symptoms are caused by Phytophthora damping-off, we can identify samples for you. Please submit diseased plants to the ISU Plant Disease Clinic, c/o XB Yang, Department of Plant Pathology, Iowa State University, Ames, IA 50011. Wrap infected seedlings in tissue paper and put them in a plastic bag so they don't dry out.
This article originally appeared on page 92 of the IC-486(11) -- May 28, 2001 issue.