Home, Garden, Turf and Landscape
Home and Garden
Plant Pest Diagnostic Tool
Retail Nurseries & Garden Centers
Landscape Professionals
UC Master Gardeners
Agriculture
Pest Management Guidelines
Decision Support Tool
Weather, Models & Degree-Days
Invasive and Exotic Pests
Natural Environments
About UC IPM
What We Do
Strategic Plan 2015–2025
Annual Report
UC IPM Programs
Program Review
Galleries
Video Gallery
Weed Gallery
Natural Enemies Gallery
Glossary
Links
Publications and Newsletters
Pesticide Information
Tools
Bee precaution pesticide ratings
Decision Support Tool
Plant Problem Diagnostic Tool
Seasonal Landscape IPM Checklist
Weather, models, & degree-days
Trainings and Events
What is IPM
Recursos en español
×
Close
Feedback
×
UC IPM
Dark discoloration and oozing of a black, viscous fluid from the base of a walnut tree infected with Paradox canker.
Credit: Janine K. Hasey
Dark discoloration and oozing of a black, viscous fluid from the base of a walnut tree infected with Paradox canker.