James Behm

Document Type

Thesis - Open Access

Award Date


Degree Name

Master of Science (MS)

First Advisor

W. E. Arnold


Each year over 5 million acres of South Dakota’s small grain crop are infested with weeds. Annual broadleaf weeds can reduce small grain yields from 30% to 50%. Weeds compete with crop plants for moisture, nutrients, and light. Blackman and Templeman report that small grains are most sensitive to competition in their early growth stages. However, vigorous, well-nourished cereal crops suppress weed growth. Therefore, early removal of weeds with herbicides should allow for a greater yield response. Additional advantages of preemergence and early post-emergence herbicide applications are less risk of damage from spray drift and reduced mechanical injury to crop plants from ground application Early control of annual broadleaf weeds in small grains is difficult with phenoxy-type herbicides because of injury to crop plants. Methyls 5-(2’, 4’ –dichlorophenoxy)-2-nitrobenzoate, hereon referred to as bifenox, has effectively controlled annual broadleaf weeds in field crops. The purpose of this study was to evaluate the response of spring wheat treated with bifenox.

Library of Congress Subject Headings

Wheat -- Weed control



Number of Pages



South Dakota State University