The descriptive-correlational study reported here sought to assess the effectiveness of the Extension Plant Pest Diagnostic Center (PPDC) for Tennessee's commercial clients. These clients are served through one-on-one consultation regarding their individual plant or household and structural pest problems through submitted samples. The results from a mailed questionnaire showed that the majority of PPDC clients felt that the information was quick enough for their needs. While one-third of the 61 respondents stated that the PPDC recommendations saved them money, only one in 10 estimated the amount of money they saved. Suggestions for future PPDC evaluation studies are discussed.

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