Can you recommend plant health advisory sites for comparing scouting approaches and pest detection examples?

Yes — here are some good plant health advisory resources where you can compare scouting approaches, pest/disease symptoms, and detection examples:

General plant health / scouting references

• UC IPM (University of California Integrated Pest Management)
  Very strong for scouting methods, pest lifecycle info, and symptom photos.
  https://ipm.ucanr.edu/

• Cornell Integrated Crop Management (Cornell IPM / Extension)
  Good scouting guidance and crop-specific pest management examples.
  https://cals.cornell.edu/integrated-pest-management

• Penn State Extension Plant Disease / Insect Pest resources
  Practical field scouting advice and diagnostic examples.
  https://extension.psu.edu/

• University of Minnesota Extension - Plant Health / Crop Scouts
  Useful scouting checklists and disease/pest identification.
  https://extension.umn.edu/

Crop protection and pest detection examples

• CABI Invasive Species Compendium / Plantwise
  Strong global pest and disease identification examples, with images and management summaries.
  https://www.cabi.org/isc
  https://www.plantwise.org/

• USDA APHIS / National Plant Diagnostic Network (NPDN)
  Good for diagnostic workflows and plant health monitoring context.
  https://www.aphis.usda.gov/
  https://npdn.org/

• FAO Plant Production and Protection resources
  Helpful for broader pest surveillance and scouting concepts, especially in international contexts.
  https://www.fao.org/plant-production-protection/en/

Disease diagnosis / symptom comparison

• APS (American Phytopathological Society) resources
  Strong disease identification references and extension-style materials.
  https://www.apsnet.org/

• PlantVillage
  Great for symptom examples and image-based disease detection comparisons.
  https://plantvillage.psu.edu/

If you want “scouting in practice”

Look for pages that include:

• threshold-based scouting
• transect or zig-zag sampling
• sticky trap monitoring
• degree-day models
• symptom photo libraries
• management decision guides

If you want, I can also give you:

1. a shortlist by crop (corn, soybean, orchard, vegetables, turf, etc.), or
2. a comparison table of these sites by scouting style, image quality, and diagnostic depth.