Date of Award:

5-2013

Document Type:

Thesis

Degree Name:

Master of Science (MS)

Department:

Plants, Soils, and Climate

Advisor/Chair:

Corey V Ransom

Abstract

Small burnet (Sanguisorba minor scop.) Is a hardy, relatively long lived evergreen forb native to Eurasia that has potential to improve grazinglands and extend grazing into late fall and winter. Trials evaluating small burnet tolerance to spring and fall postemergence herbicide applications were conducted at the Utah State University Evans farm in Millville, UT. Two small burnet genotypes were grown in a randomized complete block design with a split-plot arrangement. Twelve treatments, clethodim, clopyralid, imazamox, 2,4DB, metribuzin, aminopyralid, pendimethalin, dimethenamid-P, bromoxynil, dicamba, quinclorac, and an untreated were applied at moderate field use rates either spring or fall of the establishment year. Plots were rated for visual injury on a 0 to 100 scale where 0 = no injury and 100 = complete mortality. Ratings were done 7, 14, 60 days after treatment (DAT) and the spring following treatment. Seed yield, seed viability, and dry matter yield (DMY) were determined. Fall treatments of aminopyralid reduced seed yield 65%, seed germination 43%, and DMY 67%. Fall applied imazamox treatments reduced DMY by 36%, and seed yield by 33%, but did not impact germination. Visual injury was greatest from spring and fall applied aminopyralid treatments with ratings of 24% and 79%. Spring applied treatments did not impact seed yield or seed germination. Results suggest that clethodim, metribuzin, quinclorac, clopyralid, dimethenamid-P, bromoxynil, and pendimethalin cause little or no injury to small burnet.

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