University of Massachusetts - Amherst. UMass Extension. Greenhouse Crops & Floriculture Program.
U.S. Government Printing Office. Electronic Code of Federal Regulations.
. Systematic Mycology and Microbiology Laboratory.
University of Georgia. Center for Invasive Species and Ecosystem Health.
Oregon State University. Extension Service.
Florida Department of Agriculture and Consumer Services. Division of Plant Industry.
Minnesota Department of Agriculture.
. Plant Protection and Quarantine.
. Plantwise Knowledge Bank.
Google. YouTube; New York State Flower Industries.