This page was updated on Monday March 17 2008

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Perennial Pepperweed
(Lepidium latifolium):
Foreign invader in California's wildlands

Table 1. Herbicide control options for perennial pepperweed. Applications should be made to plants in the flower bud to early flowering stage. If incorporating mowing, mow plants early in the season (bolting to flower bud stage) and then allow plants to resprout before making applications. For specific information regarding these products please consult the label.

 
Herbicide
Site
Restrictions
Effectiveness
Telar®
(chlorsulfuron)
Noncrop
Industrial
Selective herbicide (will not harm most grasses), do not apply near water.
Excellent control for
1-2 years
Arsenal®/Chopper®
(imazapyr)

Stalker
(imazapyr)
Forestry


Noncrop Industrial
Nonselective herbicide, do not apply near water.
Excellent control for
1-2 years. Treated areas typically remain void of any vegetatioin for 1-2 years after treatment.
Roundup® and others
(glyphosate)

Rodeo® and others
(glyphosate)
Wildlands


Aquatic
Nonselective herbicide. Rodeo for areas near/in aquatic sites.
Effective unless infestation is dense. If dense, mow area and apply to resprouting plants.
Weedar 64®
(2,4-D)
Wildlands
Aquatic
Selective herbicide (will not harm grasses)
Somewhat effective unless infestation is dense. If dense, mow area and apply to resprouting plants.

 

To simplify information, trade names of products have been used. No endorsement of named products is intended, nor is criticism implied of similar products that are not mentioned.

Warning on the Use of Chemicals

Pesticides are poisonous. Always read and carefully follow all precautions and safety recommendations given on the container label. Store all chemicals in the original labeled containers in a locked cabinet or shed, away from food or feeds, and out of the reach of children, unauthorized persons, pets, and livestock.

Confine chemicals to the property being treated. Avoid drift onto neighboring properties, especially gardens containing fruits or vegetables ready to be picked.

Do not place containers containing pesticide in the trash nor pour pesticides down sink or toilet. Either use the pesticide according to the label or take unwanted pesticides to a Household Hazardous Waste Collection site. Contact your county agricultural commissioner for additional information on safe container disposal and for the location of the Hazardous Waste Collection site nearest you. Dispose of empty containers by following label directions. Never reuse or burn the containers or dispose of them in such a manner that they may contaminate water supplies or natural waterways.

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