“How late can I spray my corn?” or “How tall can my corn be when I spray?”. These are important questions to be considered, and the answer is not always obvious since delayed postemergence applications in corn have largely become a thing of the past.
June 24, 2010
Studies conducted at Michigan State showed the highest yields and greatest weed control were observed where a residual herbicide was applied preemergence and followed by either glyphosate or glufosinate postemergence.
June 3, 2010
There are several things that should be considered to maximize weed control with glyphosate from these applications. Following these guidelines can help reduce the risk of glyphosate failures, as well as reduce the chances of lower yields due to weed competition.
May 27, 2010
Five new herbicides were added to the corn section of the Weed Control Guide in 2010. They are Accent Q (p. 29), Capreno (p. 32), Integrity (p. 40), Sharpen (p. 22), Steadfast Q (p. 30).
May 13, 2010
Yukon is a postemergence herbicide targeting broadleaf weeds and nutsedge in field corn from spike to 20 inches tall with broadcast applications.
June 18, 2009
The development of stacked trait technology and the increased interest in herbicide tolerant corn has led to an increase in postemergence herbicide applications for weed control. Postemergence programs without a residual herbicide applied at planting have their place, and can provide excellent season long weed control. However, important considerations that should be made include timing, herbicide resistance, and management strategies.
June 4, 2010
In fields with emerged corn and no herbicide applied, growers have two primary options: to use an herbicide program typically applied before emergence; or switch to a total postemergence strategy.
May 7, 2009
Corn growers who have planted Roundup Ready hybrids should be aware that five hybrids have shown stress symptoms after glyphosate applications; however, the symptoms are primarily due to environmental stresses.
June 19, 2008
It is important to control volunteer potatoes to preserve corn yield, however, it is as important to control volunteer potatoes to manage pests that can be a problem if potato is in rotation for next year.
June 12, 2008
An activating rainfall is required after preemergence herbicides are applied. This rainfall stimulates seed germination exposing the seedling to the herbicide in the soil.
May 15, 2008
Herbicide inputs are a greater concern in a continuous corn system when compared growing corn in rotation with another crop. This is due primarily to increased crop residue levels as well as weed escapes from the previous year.
May 8, 2008
Preemergence herbicides should be applied as soon after planting as possible because delayed application increases the risk of poor herbicide performance, especially for grass control. However, there can be challenges for herbicide application following planting, such as high winds and rainfall.
May 1, 2008
Since the release of the 2008 Weed Control Guide for Field Crops, several new herbicides have been registered for the 2008 growing season in corn and soybean.
March 20, 2008
Giant ragweed is an early germinating, summer annual weed species that is commonly found throughout the southern two tiers of Michigan counties and throughout many areas of the Midwest. Surveys conducted in several Michigan counties this year ranked giant ragweed one of the most problematic and common weed escapes in both corn and soybean fields.
April 12, 2007
Since the release of the 2007 Weed Control Guide for Field Crops, several new herbicides have been registered for the 2007 growing season in corn and soybean.
April 12, 2007
Early season weed competition may be one of the biggest contributors to unseen yield losses in corn and soybean. Appropriately timing postemergence herbicide applications is critical to preserving crop yields.
June 1, 2006
There are several herbicide options for postemergence weed control in corn. The best choice for any given field depends on the specific situation. Three of the critical factors to consider when selecting a postemergence herbicide in corn are: 1) rotation plans, 2) corn growth stage, and 3) weed species/size in the field.
May 25, 2006
There can be many challenges for herbicide application following planting such as high winds and rainfall. Therefore, it is likely there will be situations where corn has emerged before preemergence herbicides have been applied.
May 4, 2006
Dandelion continues to be a serious problem in Michigan, mainly in no-tillage fields. Regular soil disturbance is effective at preventing the establishment of dandelion plants; however herbicide options are available to suppress dandelion in corn, soybean and alfalfa.
May 4, 2006