Descriptions of plant pests under APHIS management.
Resources

USDA. Animal and Plant Health Inspection Service. Plant Protection and Quarantine.
USDA. Animal and Plant Health Inspection Service
Citrus greening is one of the more serious diseases of citrus. The bacterial disease is spread by the Asian citrus pysllid. This site provides links to news, national program and state partner information.

National Plant Board
A non-profit organization to foster effective and harmonized plant health programs with representatives from regional, state, and national organizations.

North Carolina State University
Plant disease forecast information for blue mold; Cucurbit downy mildew; and soybean rust.