Landscape & Greenhouse Pests 
New York landscape/floriculture industry is the second fastest growing sector in NYS agriculture and valued at $200 million ranking 5th nationally. Bedding and garden plants top the list of commodities produced under 24.5 million square feet of greenhouse space and/or on 963 acres of nursery field production. Invasive species includes any vertebrate, invertebrate, weed, fungus, plant disease, livestock disease, or other organism that when introduced causes or is likely to cause economic or environmental harm. With our global trade routes, the NYS landscape/floriculture sector is bombarded monthly with invasive exotic pests from over seas or intrastate commerce.
Hemlock Woolly Adelgid (HWA) (Adelges tsugae): An insect native to east Asia, infesting hemlock trees from New England to the Carolinas. The presence of white cottony/waxy tufts that cover their bodies can be found on the bark, foliage and twigs of hemlock trees and it is a sure sign of HWA infestation. Efforts to eradicate HWA in Erie and Monroe Counties were made in 2003 and 2005.
For more information: http://counties.cce.cornell.edu/Suffolk/HortFactSheets/factsheets/Hemlock%20Woolly%20Adelgid.pdf
Viburnum Leaf Beetle (VLB) (Pyrrhalta viburni): Native to most areas of Europe, this beetle was first discovered in Ontario, Canada in 1947 and in NY in 1996. Skeletonized leaves in the spring (May-June), heavily chewed leaves in the summer (July-September), and terminal twigs with characteristic egg "caps" arranged in straight rows, seen throughout the summer months, are typical of a viburnum leaf beetle infestation. Host plants include many Viburnum species (e.g., arrowwood, cranberry bush).
For more information: http://www.entomology.cornell.edu/Extension/DiagnosticLab/IDLFS/VLBfactsheet2003.html
Ramorum Blight (PRB) (Phytophthora ramorum): is a newly described species of fungal pathogen from the Peronosporales family, exotic to the United States until June 2000. RB was found infecting Rhododendron spp. and Viburnum spp. in Germany and the Netherlands in 1993. Currently, distribution in the United States is limited to forests in California and nurseries in California, Oregon, Washington, and British Columbia. A federal quarantine is in place to prevent the movement of infected nursery stock.
For more information: http://counties.cce.cornell.edu/Wyoming/agriculture/resources/ipd/oak_disorders.htm
Giant Hogweed (Heracleum mantegazzianum): Native to the Caucasus mountains and southwestern Asia, giant hogweed is currently on the federal noxious weed list. Hogweed has been reported from parts of NY, OH, PA, MD, OR, WA, MI, VT, NH, and ME. A member of the parsley family, its most impressive characteristic is its massive size, reaching a height of 10 to 15 feet when in flower with hollow stems 2-4” in diameter with dark reddish-purple spots and bristles. Considered a public hazard, the plants sap can cause a skin reaction known as photo dermatitis when the sap makes contact with the skin and exposed to sunlight.
For more information: http://counties.cce.cornell.edu/allegany_cattaraugus/pdf/PestAlert.pdf
Chrysanthemum White Rust (CWR) (Puccinia horiana): A destructive disease native to China and Japan. Symptoms include light green and yellow spots on the upper surface of infected leaves. Shipments of chrysanthemum cut flowers from the Netherlands continue to be destroyed due to CWR detection. Aggressive eradication programs in 2002 – 2007 have successfully prevented establishment of CWR in New York and the northeast.
For more information: http://www.greenhouse.cornell.edu/pestsdis/gallery/Chryswhiterust.html
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