1994 Summary -- The Plant Disease Clinic provides diagnostic support for county and area Extension personnel and the residents of Iowa. In 1994, the Clinic received 2,843 plant samples for problem diagnosis. Approximately 50% of the samples submitted were tree samples. Field crops were the next largest group followed by herbaceous ornamentals, turf, fruit, shrubs, and vegetables.
The majority of the samples (61%) were submitted by Extension personnel. The remainder of the samples were submitted directly by homeowners or commercial growers.
Diagnosis and disease management strategies were provided for the samples received.
In addition to the infectious disease problems received, many of the plant samples showed problems caused by adverse site or environmental factors. In 1994, problems of decline, especially on trees and shrubs, appeared to be related to poor root health caused by the extended wet conditions of 1993.
A complete summary of the Clinic activity (disease highlights, number of samples received by county, clientele summary, distribution of sample types, and other information) can be obtained by contacting Carla Harris, Extension Plant Pathology secretary, at 515-294-1160.)
1995 Reminders -- Our goal in the Plant Disease Clinic is to provide an accurate diagnosis and useful control recommendations. In some cases we cannot provide a diagnosis because the sample submitted was poor or because sufficient background information was not provided. When an infectious disease problem is not evident, we rely on detailed background information about site conditions, care practices, weather conditions, etc. to pinpoint the primary cause of the problem. Please include PD-31 "Plant Disease Identification Form" (Revised Sept. 1993) with plant samples submitted for problem diagnosis. For information on how to collect a good sample for problem diagnosis, refer to Pm-1542 "Tips for Providing Plant Insect Samples to ISU". Both of these publications are free and are available from your local county Extension office or from Publications Distribution, Iowa State University, Ames, IA 50011; telephone (515)-294-5247.
This article originally appeared in the February 10, 1995 issue, p. 13.