PACIFIC NORTHWEST NURSERY IPM
There are several species of whitefly that are key pests in ornamental production. The most recent introduction in the PNW is the Q biotype whitefly which has resistance or reduced susceptibility to many insecticides. For more information on the new strain of whitefly, see the fact sheet at the link. The best site for current information and updates on Q biotype whitefly is the website developed by the Technical Advisory Committee.
Biological control (taken from the PNW Insect Management Handbook - Greenhouse Section last revised 2013)
1. ladybird beetle (Delphastus pusillus)
Chemical control (taken from the PNW Insect Management
Handbook - Greenhouse Section last revised 2012).
Direct control efforts at larvae feeding on lower leaf surfaces.
1. acephate (several labels)
ATTRA Greenhouse IPM: Sustainable whitefly control This site covers the basics in easily written language and has a strong emphasis on integrated management including good sections on biological control and the use of biorational materials and insect growth regulators.
USDA Whitefly Knowledgebase. This website has good information on the following species of whiteflies: bandedwing whitefly, greenhouse whitefly, silverleaf whitefly, and sweet potato whitefly; and a key to distinguish the above given various life stages. The management section covers many useful basics.
A Growers Guide to Using Biological Control for Silverleaf Whitefly on Poinsettias in the Northeast United States is a website designed by the University of Massachusetts Extension Service. It has extensive information on whitefly biology, biological control.
UC IPM Pestnotes website on whifeflies has one of the larger lists of the various whitefly species acting in ornamentals