Loading...

Manage Pests

Home & Landscape

Home and Landscape Pests Video Library Blogs Newsletters Invasive and Exotic Pests
Tools
Bee Precaution Pesticide Ratings Pesticide Active Ingredient Database Plant Problem Diagnostic Tool Seasonal Landscape IPM Checklist Weather, Models and Degree Days Wildlife Identification Tool
Resources
Glossary Landscape Professionals Natural Enemies Gallery Pest Management Sites Recursos en español Retail Nurseries and Garden Centers Schools and Child Care Centers Structural Pest Management Professionals UC Master Gardeners Weed Gallery

Agriculture

Pest Management Guidelines Invasive and Exotic Pests Pesticide Information
Tools
Bee Precaution Pesticide Ratings Decision Support Weather, Models and Degree Days
Resources
Glossary Mitigating Pesticides Natural Enemies Gallery Pest Management Sites Weed Gallery

Natural Areas

Natural Area Pests
Events and Trainings
About

Search
Donate

modal image place holder

Image information and credit

Feedback

Search

search

Home

Italian thistle, Carduus pycnocephalus, has groups of 2 to 5 flower heads at the tops of stems, and its stem wings are less continuous near the flower heads.

Flower heads of Italian thistle. Credit: Joseph M. DiTomaso — Credit: Joseph M. DiTomaso

Managing Pests

Agriculture
Home and Landscape
Natural Area Pests
Pesticide Safety
Invasive and Exotic

About

About UC IPM
Annual Reports
UC IPM Strategic Plan
UC IPM Programs
What is IPM?
What's New

Resources

Glossary
Links
Pesticide Information
Publications and Newsletter
Recursos en español
Trainings and Events

Get In Touch

Contact Us
Feedback

Twitter Facebook Instagram YouTube LinkedIn

Home and Landscape: Instagram|Twitter|Facebook

Use Permissions and Citations | Nondiscrimination Statement | Acknowledgements | Accessibility | Privacy Statement | Staff-Only Page | Contact UC IPM | Feedback