Research Accomplishment Reports 2011

Development of Weed Management Strategies in Agronomic Crops

W. W. Witt
Department of Plant and Soil Sciences

 

Non-Technical Summary

Grain crop production is inhibited by weeds. Weeds that inhibit grazing reduce forage quality and animal gains. This project examines the impact of weeds and tillage on crop production. This project examines methods to manage weeds that inhibit animal grazing.

2011 Project Description

Grain crops: Research focus was on Palmer amaranth and tall waterhemp, weeds resistant to glyphosate and other herbicides in Kentucky soybeans in far western Kentucky. On farm research sites in two counties demonstrated that these weeds could be controlled. Stakeholder tours of the plots were well received. A Master of Science student conducted the research for his thesis research.

Beef pastures: Tall ironweed was the target weed for research since it continues to be a major weed problem. Multiple research sites across Kentucky were chosen for this research. Commonly used herbicides were evaluated for injury to five tall fescues.

2011 Impact

Grain crops: Palmer amaranth and tall waterhemp are now found in thirty Kentucky counties and efforts to describe the negative impact of these weeds on soybean yield was well received by growers and the soybean commodity groups.

2011 Publications

Goff, B.M., G.E. Aiken, and W.W. Witt. 2011. Ergovaline recovery from digested residues of grazed tall fescue seedheads. American Society of Agronomy Annual Meeting. San Antonio, TX

Edwards, M. E, W. W. Witt, and J. D. Green. 2011. Aminopyralid persistence in two Kentucky soils as measured by soybean assay. Proc. Southern Weed Science Society.

Patton, B. P., M. Barrett, and W. W. Witt. 2011. Palmer amaranth control in Kentucky conditions. Proc. Southern Weed Science Society

Martin, J. R., J. D. Green and William W. Witt. 2011. Observation concerning herbicide resistant weeds in Kentucky. Proc. Southern Weed Science Society

Omielan, J., D. Gumm, M. Blair, and W. W. Witt. 2011. Management options for control of Chinese silvergrass. Proc. Southern Weed Science Society.

Witt W. W. 2011. Warm season perennial weed control in cool season grass hay. Abstracts of Weed Science Society of America.

Peterson, V. F., W. W. Witt et al. 2011. Utility of aminopyralid by metsulfuron for weed control, seedhead and grass height suppression in bahia and fescue roadsides. Abstracts of Weed Science Society of America.

Brabham, C. B., C. Slack, et al. 2011. Weed control in dicamba-resistant soybeans. Abstracts of Weed Science Society of America.

Tolson, J., J. Green, K. Burdine, W. Witt, and G. Schwab. 2011. Economic Assessment of integrated weed management practices used to improve forage productivity in pastures. Abstracts of Weed Science Society of America.

Martin, J.R., C. R. Tutt, and D. L. Call. 2011. Wheat contributes to weed control as a rotational crop in Kentucky. Abstracts of Weed Science Society of America.

Carter, S. and C. Slack. 2011. Four years of dicamba-tolerant soybeans in Kentucky. Abstracts of Weed Science Society of America.

Martin. J. R., D. L. Call, E. L.Ritchey and J. L. Gray. 2011. Lessons learned on wheat response to certain ALS‐inhibitor herbicides when topdressing nitrogen. Proc. North Central Weed Science Society.

Patton, B. P. and W. W. Witt. 2011. Season long control of waterhemp in no‐till soybean. Proc. North Central Weed Science Society.

Martin, J. R., J. D. Green, W. W. Witt, and B. P. Patton. 2011. Increasing concerns over Palmer amaranth and waterhemp in Kentucky. Proc. North Central Weed Science Society.

Mackey, G. A., J. D. Green, C. D. Lee, and J. R. Martin. 2011. Impact of row spacing on weed management strategies in corn. Proc. North Central Weed Science Society.