Details:

Alternative Title:
Evaluating alternative methods for vegetation control and maintenance along roadsides, study I.
Creators:
Young, Steven L. ; Claassen, Victor Paul
Young, Steven L. ; Claassen, Victor Paul Less -
Corporate Creators:
University of California, Davis. Division of Agriculture & Natural Resources
Corporate Contributors:
United States. Federal Highway Administration
Subject/TRT Terms:
[+]
California Fire Ecology Nonindigenous Pests Weeds
Publication/ Report Number:
CA07-0103
Resource Type:
Tech Report
Geographical Coverage:
California
Corporate Publisher:
California. Department of Transportation
Abstract:
This study evaluates several establishment sequences to determine effective ways to convert existing

annual non-native vegetation to native perennial species. Sustained weed control for several years is

shown to be required for vegetation conversion. No single treatment was sufficient, but each provided

different weed control characteristics. Burning provides control of non-native seeds and plants and

stimulates native perennial plant growth. Tillage prepares the seed bed, stimulates germination of

weed seed and provides soil volumes for root penetration. Ecotypic plant species are thought to be

adapted to different topographic zones away from the road edge. Herbicide use was important to

selectively reduce non-native annual plant species. Chemical treatments to control weeds included 1)

postemergence, non-selective (glyphosate), 2) postemergence, broadleaf selective (clopyralid) and 3)

preemergence, non-selective (chlorsulfuron). After vegetation conversion, herbicide use is shown to

be reduced or eliminated except for occasional weed control. After three years of cultural and

chemical management, we found native perennial grasses most abundant in sites that had been burned

once and sprayed at least twice. In established roadside stands of native perennial grasses, a

combination of spraying, mowing and/or burning for two consecutive years is required to reduce or

eliminate non-native, invasive species, such as yellow starthistle. Once established, native perennial

grass stands can persist for more than a decade and remain relatively weed resistant.


Format:
PDF
Funding:
65A0137
Collection(s):
US Transportation Collection
Main Document Checksum:
[+]
urn:sha256:cd02724e418ffc114b014d4493a587fc9c85d4e139d62355ca5dda421ac9f4db
Download URL:
https://rosap.ntl.bts.gov/view/dot/27624/dot_27624_DS1.pdf
File Type:

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