P.O. Box 1961, West Sacramento, CA 95691     (831) 442-0883     (831) 442-2351

Update on CWSS Annual Conference


The CWSS Board has decided in the best interest of the Society and its Members to transfer our annual site conference from the previously planned location in Santa Barbara to an online event for January 2021. 

Because of this change, the 73rd annual conference will undoubtedly be different than normal; however, we know our members value the information provided and we look forward to your continued support of the conference and California weed management community. 

We are moving forward with a great online program, which will include continuing education credits at a reduced registration cost. 

Look for more information in the coming days regarding the different opportunities for you and your company to participate in the meeting. 

For the most recent updates, please continue to check our website at CWSS.org.

Announcing the 2021 “Virtual” Student Poster Competition

Application & details here      

















Voting privileges are open to
Regular, Student, and Honorary members only.

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Principles of Weed Control 4th Edition

This is a weed management book with a focus on California’s unique mix of crops, but with relevance to other areas as well. The book is for sale at Amazon and Barnes and Noble in ebook and paperback editions.


Weeds of California This new weed identification book has been in the making for over 6 years. It is the most comprehensive weed identification book yet produced in the United States. It contains over 3000 color photos of infestations and whole…


Aquatic and Riparian Weeds of the West This is practical guide to the identification and biology of submerged, floating leaved, and emergent aquatic weeds in the Western United States. The book contains a full description of 89 species representing 36 plant families…


Ecology of Weeds and Invasive Plants: Relationship to Agriculture and Natural Resource Management, 3rd Edition The Third Edition of the authoritative reference gives readers an in-depth understanding of how weeds and invasive plants develop and interact in the environment so they can manage and control…


There are times in the history of any organization when the members should pause and re-examine the reasons for existence of the organization, the purposes of the organization, and the goals toward which it is striving. And there are times for remembering those who were responsible for the organization’s inception, and for its program and achievements.

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The CWSS will be the premier authoritative source of information on weed biology and weed management in California and will serve as a forum for all individuals interested in these disciplines.


The California Weed Science Society provides information exchange on weed science and technology through an annual conference, publications, and other activities; advises stakeholders on matters pertaining to weeds; facilitates cooperation among individuals, agencies…

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