Agdia – Site developed by Agdia Incorporated and describes their disease testing services.

Everris – Site developed by Everris and describes their testing services and nutrition products.

Plant Management Network – Site developed by The Plant Management Network, and it a not-for-profit (an annual subscription fee is required) resource related to IPM systems.

Virtual Herbarium of the Chicago Region – Site developed by three Chicago area botanical gardens to assist in identifying plants.