Lesser Swinecress Control: Tips For Controlling Swinecress Plants

Lesser Swinecress Control: Tips For Controlling Swinecress Plants

By: Liz Baessler

Swinecress (Coronopus didymus syn. Lepidium didymum) is a weed found throughout much of the United States. Keep reading to learn more about how to control swinecress.

Swinecress Identification and Control

Swinecress plants are known by a number of names that include:

  • Wild Tansy
  • Hogweed
  • Blackweed
  • Roman Wormweed
  • Hay-fever Weed
  • Wartcress
  • Lesser Swinecress
  • Annual Ragweed

Swinecress seedlings can be identified by small, narrow, lace-shaped cotyledons (first leaves) that are followed by larger leaves of the same shape with hairy tips. In the beginning of its life, the plant grows as a rosette with radiating stems of these leaves. As it matures, these stems grow out along the ground, sometimes reaching 20 inches (50 cm) in length, turning up slightly at the tips.

The deeply lobed leaves can reach 3 inches (7 cm) in length and are sometimes, but not always, hairy. Tiny white four-petaled flowers form along the stems in clusters. Swinecress weeds are annuals or biennials, depending upon climate. Blooming may take place in the summer, winter, or both, depending upon where you live.

Swinecress identification is especially easy due to its strong, unpleasant smell. When the leaves are broken in any way, they produce a pungent, skunky odor.

How to Control Swinecress Weeds

Swinecress reproduces via dropped seed pods, meaning what is a small patch now will likely be a big patch next year. It is most common in worked or tilled soil where other things are trying to grow, like gardens and orchards. It also grows in pastures, and milk from cows that eat it has been known to take on an unpleasant taste.

All in all, it’s not usually a welcome sight and should be eradicated if it appears in your garden. That said, swinecress control is tricky, and once the plants are present, they are very difficult to kill off by hand.

Herbicide application is really the most effective way to get rid of them.

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Weeds

There are as many different ideas about favorite crops, plants and flowers as there are farmers and gardeners, but everyone can agree on at least one thing: weeds are no fun! Whether they're crowding out your perennials or getting in the way of healthy forage, weeds present an ongoing challenge for anyone who wants to grow anything.

UGA Extension provides advice on controlling and preventing common weeds like crabgrass, pigweed, henbit, and chickweed to help commercial farmers and home gardeners have the most trouble-free growing seasons possible.

Websites

UGA-affiliated sites

UGA Weed Science The weed science faculty and staff are committed to providing the information and resources you need to answer your weed control questions.

Sustainable Agriculture at UGA Brings together information on sustainable agriculture including weed management and other resources.

Forest Weed Control Weed control recommendations for forests.

Invasive and Exotic Plants Lists of noxious weeds in North America.

UGA Department of Crop and Soil Sciences Learn more about the crop and soil sciences department at the UGA College of Agricultural of Environmental Sciences.

Weed Management Information from Georgia Turf on weed management.


Inspection

Once you have confirmed that you are dealing with Dichondra, you can then move on to inspection. During this phase, you will locate areas where Dichondra is thriving and observe the conditions that are allowing it to thrive. This information will help you in knowing where to focus your herbicide application.

Where to Inspect

Dichondra thrives on lawns and comes up in little bunches and can spread via tubers and can easily start popping up everywhere and invade and take over a whole yard. Dichondra tends to thrive in lawns that have potty turf or are weak or thinning in certain areas. Hence, the presence of dichondra may be a sign you are not giving your lawn enough TLC.

What to Look For

It's distinguishing traits are the kidney-shaped to nearly circular leaves which grow opposite each other, sometimes appearing whorled on the stems. The white to greenish small flowers develop in clusters in the leaf axils below the level of the leaf.


WEED IDENTIFICATION - PowerPoint PPT Presentation

WEED IDENTIFICATION TRI-CO. YOUNG FARMERS MARCH 7, 2002 Original Power Point Created by Joey Wells Modified by Georgia Agricultural Education Curriculum Office – PowerPoint PPT presentation

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presentations for free. Or use it to find and download high-quality how-to PowerPoint ppt presentations with illustrated or animated slides that will teach you how to do something new, also for free. Or use it to upload your own PowerPoint slides so you can share them with your teachers, class, students, bosses, employees, customers, potential investors or the world. Or use it to create really cool photo slideshows - with 2D and 3D transitions, animation, and your choice of music - that you can share with your Facebook friends or Google+ circles. That's all free as well!


More information

  • Key to weeds in turf and landscapes
  • Weed identification tool
    A technical key to identifying weeds, from the UC Weed Research and Information Center
  • UC WRIC online education programs
    Videos on weed identification and management, from the UC Weed Research and Information Center
  • Research related to weeds

For noncommercial purposes only, any Web site may link directly to this page. FOR ALL OTHER USES or more information, read Legal Notices. Unfortunately, we cannot provide individual solutions to specific pest problems. See our Home page, or in the U.S., contact your local Cooperative Extension office for assistance. .

Agriculture and Natural Resources, University of California


How to Manage Pests

Plants form rosettes

Roll over photos for more images. Click on the photos for more information on identification and biology.

View by weed name

If you can't find the name of your weed, try the Weed Research Information Center Weed ID Tool. For further assistance in California, contact your local UC Cooperative Extension or Master Gardener office. Other states, contact your local county extension office.

Statewide IPM Program, Agriculture and Natural Resources, University of California
All contents copyright © 2019 The Regents of the University of California. All rights reserved.

For noncommercial purposes only, any Web site may link directly to this page. FOR ALL OTHER USES or more information, read Legal Notices. Unfortunately, we cannot provide individual solutions to specific pest problems. See our Home page, or in the U.S., contact your local Cooperative Extension office for assistance.

Agriculture and Natural Resources, University of California


Herbicide Use Tables

Visit www.ent.uga.edu/pest-management for the most up-to-date herbicide information. Always go by the label, even if it differs from the information presented here.

T = Tolerant T(D) = Tolerant only when turfgrass is dormant S = Sensitive, DO NOT use this herbicide I = Intermediately tolerant, use herbicide with caution at reduced rates.

T = Tolerant T(D) = Tolerant only when turfgrass is dormant S = Sensitive, DO NOT use this herbicide I = Intermediately tolerant, use herbicide with caution at reduced rates.

1 Use glyphosate on dormant bermudagrass, for spot treatments or for edging.

Status and Revision History
In Review for Major Revisions on Feb 26, 2009
Published with Major Revisions on Aug 25, 2011
Published with Minor Revisions on Mar 09, 2015


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