Weed Control Timing

Weed management in alfalfa- Postemergence options

Once alfalfa breaks dormancy and has appreciable new growth, most broadleaf herbicides can cause injury to alfalfa. When trying to determine whether to apply herbicides or not, remember in many cases the easiest and most economical solution for weed control is the first cutting.

May 20, 2010

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How late can postemergence herbicide applications be made in corn?

“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

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Scouting Michigan fields for Palmer amaranth

Scouting will be key to stopping the spread of glyphosate-resistant Palmer amaranth in Michigan.

 

It has been almost three years (fall 2010) since Palmer amaranth resistant to glyphosate (Roundup) and ALS-inhibiting herbicides was first reported in Michigan.  Initially, populations of this weed appeared to be localized to parts of St. Joseph and Kalamazoo counties. However, last summer more populations of Palmer amaranth were confirmed in nine Michigan counties: St. Joseph, Kalamazoo, Cass, Barry, Ionia, Clinton, Shiawassee, Gratiot, and Livingston.  This weed is not native to Michigan and with resistance to glyphosate and other effective herbicides this weed is undoubtedly the toughest that Michigan growers have ever faced.  In fact, in many Southern states where this weed is a problem it has been reported that the average increased cost to manage this weed ranges from $30 to $50 more per acre.

 

May 30, 2013

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Postemergence herbicide applications in corn- Residual option

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

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Weed control advice in corn and soybean with recent planting delays

Wet conditions this spring have made it a challenge for growers to plant corn and soybean. Due to these planting delays, once fields are dry enough getting the crop into the ground will be the first priority. However, it is important to remember good weed control will be essential to get the most out of these crops...

 

May 20, 2014

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Preharvest herbicide use in dry edible beans: Function timing and rotation restrictions

Over the next 2 ½-months many Michigan dry bean fields will be treated with preharvest herbicides. Preharvest herbicides, also known as “Harvest Aids”, are used to desiccate or dry down “green” stem and leaf tissue that can hinder dry bean harvest. The main intention of preharvest herbicide applications is to desiccate weeds; however many growers use these herbicide applications to hurry along or even out the maturing process of dry beans. Currently in Michigan, there are four different herbicide options...

 

Posted August 20, 2015

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Timely POST herbicide applications will improve profits in soybean

Early season weed competition may be one of the biggest contributors to unseen yield losses in soybean. Appropriately timing postemergence herbicide applications is critical to preserving crop yields.

June 10, 2010

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Timing and good record keeping are important for sugarbeet weed control

For most of us the use of glyphosate (Roundup) in Roundup Ready sugarbeets has made weed control simpler and more consistent. However, as with any changes in production practices there is still a learning curve to using this technology.

May 14, 2009

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Wet conditions and rapid wheat growth may alter your weed management plans

The colder than normal spring and recent wet weather has made it difficult to spray winter wheat this year for weeds. While we normally would have all of our wheat herbicides applied by now, there are still several fields that have not been sprayed...

 

May 15, 2014

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Common lambsquarters escapes in sugar beets: What are my opinions

When application timings are missed, common lambsquarters is often the number one weed escape. These escapes can reduce yield by competing for moisture and light, cause problems with topping and harvest, and produce seed that will lead to future problems.

June 12, 2008

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Preharvest herbicide options for soybean: Weeds may be an issue

Consider using a preharvest herbicide application in weedy soybean fields this year.

The lack of good row closure and challenges with weed control this season has left several soybean fields weedy as harvest approaches.  Without a killing frost, the “green” stems and leaf tissue of these weeds can cause issues with harvest.  Currently in Michigan there are four different herbicide options labeled as “Harvest Aids” to help desiccate or dry down the “green” stem and leaf tissue of weeds that can hinder soybean harvest.  These herbicides are glyphosate (Roundup and several other formulations), Gramoxone 2SL (paraquat and other formulations), Clarity 4L (dicamba), and Aim 1.9EW (carfentrazone).  Differences in these products include the speed of activity, preharvest intervals, recropping restrictions, and effectiveness.

September 20, 2012

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Preharvest herbicide applications in dry edible beans- Avoiding illegal residues

Preharvest herbicide applications in dry edible beans have become more popular as growers switch to direct harvesting techniques.  Herbicides used prior to harvest, also known as “Harvest Aids”, are used to desiccate or dry down “green” stem and leaf tissue that can hinder dry bean harvest.  The main intention of preharvest herbicide applications is to desiccate weeds; however many growers are using these herbicide applications to hurry along or even out the maturing process of dry beans. 

 

August 25, 2011

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Don't skip burndown herbicide applications this spring

Not starting with a clean field will lead to soybean yield reductions.

May 5, 2011

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Time is ticking down for herbicide applications in winter wheat

There are several herbicide options available for weed control in winter wheat. However, weed control spectrums and the maximum stages of winter wheat growth when these herbicides can be applied can be very different.

April 29, 2010

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Don't wait to make burndown herbicide applications in no-till soybean

As several no-till drills start planting fields, remember the importance of a timely burndown application.

April 29, 2010

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Postemergence herbicide application in corn- It's all about timing

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

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Managing weeds using a stale seedbed approach

Managing weeds using stale seedbeds can reduce weed populations by stimulating the germination of seeds close to the surface so they can be managed prior to planting.

April 30, 2009

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Herbicide applications, especially micro-rates, need to be timely in sugarbeets

While the timing of glyphosate (Roundup, etc.) may not be as critical for weed control as some of the strategies that we currently use i.e., micro-rates and standard splits, there is still 50% of the acres that are planted with conventional sugar beets. Timely herbicide applications over these acres are critical for adequate weed control.

May 15, 2008

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Temperature effects on burndown herbicide applications

The drastic swings in temperature over the last several weeks have growers questioning what effect temperature has on weed control from burndown herbicide applications.  Several years ago we conducted trials...

 

April 12, 2012

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Harvest aid options in soybean

Frost usually helps desiccate these weeds, however if soybeans are ready to be harvested before weeds have dried down, there are a few herbicide options that growers can use as harvest aids to help desiccate or dry down “green” stem and leaf tissue.

September 17, 2009

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Delayed preemergence and early postemergence herbicide applicaitons in corn

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

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Watch winter wheat growth prior to applying herbicides

Knowing what stage your wheat is at is critical when it comes to making decisions on what herbicide to use for weed control.

April 30, 2009

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Late-season glyphosate application in Roundup Ready soybean can be off label

Making one more glyphosate application in Roundup Ready soybean is tempting when weeds are poking through the soybean canopy. However, it is important to remember that there is a maximum soybean growth stage for which glyphosate can be applied to Roundup Ready (glyphosate-resistant) soybeans.

August 6, 2009

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The clock is ticking for herbicide applications in winter wheat

Of all the crops grown in Michigan, winter wheat has typically been the crop that has not been intensively managed. However with higher wheat prices, growers are looking at more intensive management to maximize yield.

April 17, 2008

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Horseweed needs to be managed early for effective control in soybeans

Glyphosate-/multiple-resistant horseweed (marestail) is fairly common in many of Michigan’s no-till soybean fields (Figure 1). In fact, of the 18 horseweed samples that were tested for resistance this winter by MSU Diagnostic Services 100% of them were resistant to glyphosate (Group 9) and 78% of them were resistant to both glyphosate (Group 9) and the Group 2 (ALS) herbicides. Because of resistance problems and weather conditions that favored horseweed emergence last year, horseweed control failures were common in soybean.

 

April 14, 2016

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Get the most out of your glyphosate applications

There are several things that should be considered to maximize postemergence weed control with glyphosate from these applications in Roundup Ready soybean.

May 28, 2009

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Weeds not controlled prior to soybean emergence can reduce yield

With the wet conditions keeping many growers out of the field, soybean planting is occurring at a slower pace and once conditions are favorable many growers may opt to plant first and apply a burndown later. However, it is extremely important that weeds that are currently in fields be controlled prior to soybean emergence.

May 14, 2009

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Herbicide options for weed control in winter wheat: Things to consider

Over the next month, many of Michigan’s winter wheat acres will be treated with herbicides for weed control. While there are several herbicide options available for use in wheat, there are many factors that growers should consider prior to deciding when to spray and what products to use.

 

April 14, 2016

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No-till Roundup Ready soybean: What you need to know

While glyphosate continues to provide excellent control of most weeds, timely applications before planting and after soybean emergence are necessary to ensure the best growing conditions for your soybean crop. The following recommendations are based on MSU research funded by the Michigan Soybean Promotion Committee (MSPC).

May 7, 2009

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Delayed preemergence and early postemergence herbicide applications in corn

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

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Improve profits with timely postemergence herbicide applications in soybean

Several studies have shown that delaying postemergence weed control strategies can substantially reduce crop yield. This has become more of a concern with the large number of glyphosate-resistant crop acres that rely on postemergence applications of glyphosate for weed control.

June 5, 2008

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Maximizing glyphosate activity with a few simple tips

There are several things that should be considered to maximize weed control with glyphosate from these applications in Roundup Ready soybean. Following these guidelines can help reduce the risk of glyphosate failures, as well as reduce the chances of lower soybean yields due to weed competition.

May 29, 2008

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Weeds not controlled prior to soybean emergence can reduce yield

Driving around the state I have noticed several no-till fields that still have carpets of winter annual and some newly emerged early summer annual weeds, like common lambsquarters and giant ragweed. With soybean planting is in full swing, it is extremely important that these weeds be controlled prior to soybean emergence.

May 15, 2008

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Weed control in soybean can benefit from preemergence soil-applied herbicides

The flexibility in application timing that glyphosate offers may make it easier to control larger weeds, however the benefits of early-season weed control to protect crop yield can be lost if applications are not made in a timely manner. Additionally, untimely applications can lead to a reduction in weed control.

May 1, 2008

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Improving weed control in no-till Roundup Ready soybean

No-till soybean production in Michigan relies almost exclusively on glyphosate for preplant and postemergence weed control. While glyphosate continues to provide excellent control of most weeds, timely applications before planting and after soybean emergence are necessary to ensure the best growing conditions for your soybean crop.

April 2, 2008

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TImely postemergence herbicide applications can increase profits

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

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TImely postemergence herbicide applications can increase profits

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

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