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Perennial Grass Establishment Integrated with Clopyralid Treatment for Yellow Starthistle Management on Annual Range

Published online by Cambridge University Press:  20 January 2017

Stephen F. Enloe*
Affiliation:
Department of Vegetable Crops, University of California, Davis, CA 95616
Joseph M. Ditomaso
Affiliation:
Department of Vegetable Crops, University of California, Davis, CA 95616
Steve B. Orloff
Affiliation:
University of California Cooperative Extension, Yreka, CA 96097
Daniel J. Drake
Affiliation:
University of California Cooperative Extension, Yreka, CA 96097
*
Corresponding author's E-mail: [email protected]

Abstract

Yellow starthistle is an aggressive annual forb that has invaded millions of hectares of California's annual range. Control efforts such as burning and herbicides have been effective for short-term management. However, recruitment from the seedbank or reinvasion of the annual grassland system results in a rapid return to yellow starthistle dominance. Establishing perennial grasses would be ideal for suppression of yellow starthistle. However, a lack of effective weed control options in California during a seeding program has limited perennial grass establishment. Clopyralid was used to control yellow starthistle annually for 1, 2, or 3 yr to provide a window of reduced competition for pubescent wheatgrass establishment. Total plant cover, yellow starthistle density, biomass, and seedhead number were quantified for 6 yr. Clopyralid treatment significantly reduced yellow starthistle and allowed pubescent wheatgrass establishment with a single treatment. Both clopyralid treatment and pubescent wheatgrass establishment significantly affected the range plant community composition. Annual grasses and forbs increased in plots only treated with clopyralid for 2 or 3 yr, whereas clopyralid-treated pubescent wheatgrass plots maintained lower annual grass and forb cover. Integrating pubescent wheatgrass seeding with clopyralid treatment provided long-term yellow starthistle suppression, whereas clopyralid treatment alone resulted in a plant community susceptible to repeated invasion. These findings support the establishment of competitive perennial grasses in annual grasslands as an important component of long-term yellow starthistle management.

Type
Research Article
Copyright
Copyright © Weed Science Society of America 

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References

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