Since 2002, the National Plant Diagnostic Network (NPDN, <a href="http://www.npdn.org/)">http://www.npdn.org/)</a> and the Southern Plant Diagnostic Network (SPDN, <a href="http://spdn.ifas.ufl.edu/)">http://spdn.ifas.ufl.edu/)</a> have provided support for a cohesive system to quickly detect and identify pathogens and other pests that have been accidentally or deliberately introduced into agricultural and natural ecosystems.