Rick Buell asks "What labs in the US or elsewhere have you used for testing? Can you describe the approximate expense of this service?" and I too would appreciate this information. There is a 1997 publication from UC Davis with the promising title "Easy On-Site Tests for Fungi and Viruses in Nurseries and Greenhouses". http://homeorchard.ucdavis.edu/8002.pdf Although that was written 17 years ago perhaps some of it is still relevant. On page 2 it gives a useful overview of virus diagnosis, then introduces the ELISA technique. Is this ELISA the technique currently used? "The virus test kits require more skill and patience ..." so perhaps sending material to a lab is a better option. Would a test kit for crops be relevant to testing our bulb plants? - Gastil