Hare barley (Hordeum murinum ssp. leporinum) biology and management in cool season perennial grass pastures of western Oregon Public Deposited

http://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/dn39x422s

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  • Hare barley (Hordeum murinum ssp. leporinum) is a cool season annual grass that invades pastures and range areas around the world. A documented weed management issue in several Oregon counties, hare barley may infest several thousand acres in western Oregon. This study was conducted to investigate the biology and develop management options for hare barley in cool season, established perennial grass pastures. Field and laboratory studies were initiated in the fall of 2008 to generate this information for hare barley management. Experiments were conducted to evaluate herbicide treatments applied before and after hare barley emergence in perennial grass pastures. Multi-year applications of a labeled pasture herbicide, aminopyralid, and non pasture labeled herbicides, imazamox and imazamox + MCPA ester, were the only treatments that consistently resulted in a high level of hare barley control with acceptable crop safety. A laboratory experiment was initiated to develop a growing degree day model to understand when viable seed is produced in hare barley. We determined that viable seed set depends on cumulative growing degree days (GDD) regardless of the location from which the seeds were collected. The majority of hare barley seed becomes viable after accumulating approximately 2300 GDD. This result indicates that individual pasture owners and hay producers can monitor growing degree days in their respective farming locations and base their management strategies for controlling hare barley and for preventing the spread of hare barley to other locations prior to viable seed production. A survey conducted to understand the distribution of hare barley across Oregon indicated that hare barley distribution is limited to western Oregon while two other species in the Hordeum murinum complex, ssp. glaucum and ssp. murinum, can also be found in the state of Oregon.
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