Pest Management in the United States Greenhouse and Nursery Industry: II. Disease Control

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  • 1 Associate professor and extension plant pathologist, North Carolina State University, 2422 Gardner Hall, Raleigh, NC 27695-7616.
  • 2 Emeritus professor of plant pathology, Central Florida Research and Education Center, University of Florida, Apopka, FL 32703.
  • 3 Associate professor and extension horticulturist, University of Georgia, P.O. Box 1209, Tifton, GA 31793.
  • 4 Associate professor and extension entomologist, University of Georgia, P.O. Box 1209, Tifton, GA 31793.
  • 5 Associate professor, University of Florida Research and Education Center, Route 4, Box 4092, Monticello, FL 32344-9304.
  • 6 Professor, Department of Statistical and Computer Service, Coastal Plain Experiment Station, Tifton GA 31793.

A national survey of the commercial ornamental industry was conducted to determine the current status of pest control including chemical and nonchemical disease control practices. The fungicides thiophanate methyl, chlorothalonil, mancozeb, and metalaxyl were used in the greatest quantity and by the largest percentage of growers. Metalaxyl was used in greenhouse and field operations by the highest percentage of growers, primarily to control root diseases but many growers reported using metalaxyl to control foliar disease. Overall, more fungicides were used in the field for foliar diseases, whereas almost equal amounts of fungicides were used for foliar and root diseases in the greenhouse.

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