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United States Department of Agriculture

Agricultural Research Service

Research Project: PEST BIOLOGY, ECOLOGY, AND INTEGRATED PEST MANAGEMENT FOR SUSTAINABLE AGRICULTURE

Location: North Central Agricultural Research Laboratory

Title: Seedling emergence of yellow woodsorrel in eastern South Dakota

Author
item ANDERSON, RANDAL

Submitted to: Western Society of Weed Science Research Reports
Publication Type: Research Notes
Publication Acceptance Date: December 1, 2007
Publication Date: March 11, 2008
Citation: Anderson, R.L. 2008. Seedling emergence of yellow woodsorrel in eastern South Dakota. Western Society of Weed Science 2008 Research Progress Report. pp. 152-153.

Interpretive Summary: Yellow woodsorrel is a perennial weed invading no-till rotations in eastern South Dakota. We studied seedling emergence of yellow woodsorrel to understand why the weed is expanding its infestation of cropland. Approximately 80% of seedlings emerged during the six-week interval between May 9 and June 15, but some seedlings continued to emerge during July. Comparing no-till and conventional tillage, 3 times more seedlings emerged in no-till. Seedlings will start flowering 4 weeks after emergence and dispersing seeds after 8 weeks of growth. Producers may be able to suppress invasion of yellow woodsorrel into production fields by including crops such as canola or alfalfa in their rotations.

Technical Abstract: Yellow woodsorrel is a perennial weed invading no-till rotations in eastern South Dakota. This study quantified the seedling emergence pattern of yellow woodsorrel across a four-year period. Yellow woodsorrel began emerging in early May and continued for 14 weeks. Approximately 80% of seedlings emerged during the six-week interval between May 9 and June 15, but some seedlings continued to emerge during July. Comparing no-till and conventional tillage, the total number of seedlings that emerged yearly was 3 times higher in no-till. The emergence pattern, however, did not differ between tillage systems. The growth period of yellow woodsorrel was quite short. In established stands, seedlings began flowering 4 weeks after emergence and dispersing seeds after 8 weeks of growth. Based on observations of yellow woodsorrel in production fields, we suggest that adding crops such as canola or alfalfa to the rotation may help manage this weed.

Last Modified: 7/25/2014
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