UCCE Master Gardener Program
of Humboldt and Del Norte Counties
Humboldt County Office
5630 South Broadway
Eureka, CA 95503
Del Norte County Office
586 G Street
Crescent City, CA 95531
Weeds - Identifying and Controlling
IPM Weed Identification The UC IPM Weed Photo Gallery includes many, but not all, weed species commonly found in California farms and landscapes.
Identification Key This key includes the most common weeds found in California lawns. Other species may occur but are not of major importance in turf. Because flowering parts are often mowed and not seen in turf, this key was developed using vegetative characteristics. Identifying weed species is essential for choosing appropriate management practices.
List of Weeds The UC IPM Weed Photo Gallery includes many, but not all, weed species commonly found in California farms and landscapes. Additional species will be added over time.
Invasive Weeds Humboldt County 5-23-16 - Humboldt Weed Management Area Publication
Principles of Weed Control
In order to control weeds, you must first understand the principles of ecology that dictate how weeds interact in the environment. Joe DiTomaso and a cast of UC Davis experts take us on a tour of these basic concepts.
Part 1 Introduction, preventing weeds through sanitation (5:43)
Part 2 Competition in landscapes and lawns, annuals and perennial (9:43)
Part 3 Weed seed bank (7:46)
Part 4 Controlling annual and perennial weeds. perennial reproductive structures (8:28
Part 5 Mowing or post-emergence herbicide control, conclusion (4:13)
Weed Control Techniques
These videos describe different strategies for controlling weeds in landscapes and gardens. An array of experts and researchers discuss both chemical and non-chemical methods that include: mechanical, cultural, biological and herbicide control. Special attention is paid to herbicides and how to achieve selectivity and calibrate them.
Part 1 Mechanical control, cultural techniques, turf control (13:55)
Part 2 Biological control, chemical pathway, formulations (11:56)
Part 3 Calibration (10:31)
Part 4 Selective application (7:57)
UC Publications on Weeds Purchase books or find free down loadable publications