Giant Ragweed Control In Soybeans

Giant and common ragweed johnsongrass and marestail all produce spring growth that can reduce winter wheat harvesting efficiency and may lead to dockage from increased moisture and foreign matter.

Giant ragweed control in soybeans. Common and giant ragweed i ll group these together because the control options are similar. If wet weather has delayed postemergence herbicide application to your soybeanfields there may be some large giant ragweed that needs treating. Breitenbach fritz r lisa m. Remember individual results may vary so always read and follow label directions.

Residual control of marestail is essential in roundupready and nongmo soybeans since there are no postemergence options. The wet season has delayed crop development and post emergence herbicide applications in many soybean fields and there are some large giant ragweed waiting to be treated. Roundup ready and liberty link fields in this situation should generally be treated with the maximum rate of herbicide allowed 1 5 pounds ae a of glyphosate or 36 ounces. Behnken annette kyllo and reed searcy the objective of this trial was to evaluate herbicide programs for giant ragweed control in soybeans in southeastern minnesota in 2016.

The research site was a loamy sand series with ph of 6 4 o m. Studies and results in depth looks at two more tough to control weeds and a table of rainfast times for common products. Giant ragweed control was 10 percent greater with authority first sonic at a 6 4 oz a application rate than at the 4 5 oz a. Cobra comes in third place.

Effective control of giant ragweed has relied heavily on the use of herbicides. Marestail is the one weed in this group that can often be adequately controlled with residual herbicides assuming an effective burndown. If you don t have als resistant ragweed firstrate is our 1 choice. Roundup ready and liberty link fields in this situation should generally be treated with the maximum rate of herbicide allowed 1 5 lbs ae a of glyphosate or 36 oz of liberty.

The wet season has delayed crop development and postemergence herbicide applications in many soybean fields and there are some large giant ragweed waiting to be treated. Prior to the wide spread use of roundup ready soybean als inhibiting herbicides such as firstrate and classic were used extensively for giant ragweed control. Following wheat harvest weeds may survive and be difficult to control in double cropped soybeans. In soybean there are fewer herbicide options for controlling giant ragweed than in corn.

Mark loux ohio state university recommends using the full rate of herbicideallowed in roundup ready or liberty link fields. If you have a very dense population of giant ragweed on your farm improving control and reducing weed density by an additional 10 will help the postemergence program clean up the remaining giant ragweed in your field.