Contributing practices to herbicide-resistant waterhemp
Waterhemp is one of the most common weed species found in Midwest field crops. A member of the pigweed (Amaranth) family, this summer annual is capable of producing over a million seeds per plant while significantly reducing crop yields.
Glyphosate-resistant waterhemp has been confirmed in 12 states. In Missouri, over two-thirds of the waterhemp populations sampled from soybean fields were found to be resistant to the herbicide glyphosate.
In the current issue of Weed Technology, a study is reported that sought to identify factors that could serve as predictors of glyphosate resistance in future populations of this weed. Waterhemp seed samples were collected from 144 soybean fields in 54 Missouri counties in 2008 and 2009 and served as the basis for the conclusions. Landowners from each survey location were contacted to determine a 5-year history of crop rotation and herbicide use.
In this study, 94 percent of the glyphosate-resistant waterhemp populations had three field aspects in common: (1) soybeans were the only crop in consecutive years, (2) glyphosate was the only herbicide used for three or more years and (3) the field contained waterhemp showing obvious signs of having survived the previous herbicide application. These factors provide the best indication that glyphosate-resistant waterhemp is likely to occur in the future.
Full text of the article, “A Survey of Glyphosate-Resistant Waterhemp in Missouri Soybean Fields and Prediction of Glyphosate Resistance in Future Waterhemp Populations Based on In-Field Observations and Management Practices,” Weed Technology, Vol. 27, No. 4, October-December 2013, is available at http://www.wssajournals.org/doi/full/10.1614/WT-D-13-00042.1.
Self-contained hydraulic system with power cables (hydraulic). Tandem Henschen axles (hydraulic). Hydraulic fenders. Manual or hydraulic tilt. 6,500-gallon tank.
- Avoid contaminating seed super boxes in handling
- U.N. warns food security a risk to Asia-Pacific
- Ag markets ended Tuesday in mixed fashion once again.
- Vietnam cuts rice export price floor, eyes Manila tender
- Ag markets turned decidedly mixed Tuesday morning
- Calculations for March 1 corn stocks estimate
- Are you in favor of a federal labeling standard for food that might contain genetically modified ingredients?
- Commentary: Barking up the wrong tree
- Julie Borlaug says biotech is necessary in fight against hunger
- Larson Electronics offers 150 Watt LED high bay light fixture
- Water allocation for most drought-stricken Calif. farms to end
- Panama says 'go' to GM mosquito evaluation
Ranco Bucket Elevators
Ranco Fertiservice Inc.