Rangeland Ecology & Management

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Effects of clipping and sheep grazing on dyers woad
Author
West, N. E.
Farah, K. O.
Publisher
Society for Range Management
Publication Year
1989-01-01
Body

Dyers woad (Isatis tinctoria L.) is an introduced cruciferous forb that is rapidly expanding on intermountain rangelands and is apparently reducing production and regeneration of more desirable forage plants. Mechanical and chemical controls are expensive as well as having deleterious effects on nontarget species. Limitations to controlling this noxious weed by early spring grazing were investigated with clipping experiments at 1 site in the Wasatch foothills of northern Utah. These results were compared with actual utilization of woad by sheep at a poor condition example of that site. Significant mortality and reduction in reproductive performance occurred when at least 60% of the aboveground phytomass had been removed on or after 23 May. Clipping twice, to remove as much as 90% of aboveground tissue before 23 May, did not significantly affect woad mortality, percent flowering, or fruit production. Sheep did not graze this weed heavily enough at late enough dates to significantly affect mortality or seed production. Even on a poor condition range, these animals switched to other forages after about 15 May. Stocking rates required to restrict dyers woad at our clipping site would likely result in further range deterioration. More host-specific biological control agents should be examined. This material was digitized as part of a cooperative project between the Society for Range Management and the University of Arizona Libraries. The Journal of Range Management archives are made available by the Society for Range Management and the University of Arizona Libraries. Contact lbry-journals@email.arizona.edu for further information. Migrated from OJS platform August 2020

Language
en
Resource Type
Text
Document Type
Journal Issue/Article
Digital Object Identifier (DOI)
10.2307/3899648
Additional Information
West, N. E., & Farah, K. O. (1989). Effects of clipping and sheep grazing on dyers woad. Journal of Range Management, 42(1), 5-10.
IISN
0022-409X
OAI Identifier
oai:repository.arizona.edu:10150/645005
Journal Volume
42
Journal Number
1
Journal Pages
5-10
Journal Name
Journal of Range Management
Keywords
Isatis tinctoria
cultural control
biological control
weed control
mortality
cutting
sheep
Utah
grazing