eUpdate Articles Tagged: weed control


Fall musk thistle control

weed control weeds musk thistle 

Consider fall treatments for control of marestail in soybeans

weeds fall-applied weed control herbicide marestail soybeans 

New K-State 2019 Chemical Weed Control Guide now available online

weeds weed control publication 

Marestail in soybeans: Strategies for the best control

weeds weed control soybeans 

Late-winter preplant applications for kochia control

weeds winter weed control kochia herbicide 

Palmer amaranth resistance to 2,4-D and dicamba confirmed in Kansas

planting weed control herbicide dicamba palmer amaranth weeds 

New publication on integrated pigweed management now available

weed control publication pigweed 

Control of mustards in wheat - Timely treatment is important

Too often producers do not notice mustard weeds in their wheat fields until the mustards start to bloom in the spring. As a result, producers often do not think about control until that time. Minimize yield loss by getting control of these weeds by late winter or very early spring.

wheat mustards weed control 

New K-State 2020 Chemical Weed Control Guide now available online

The new 2020 K-State Weed Control Guide is now available online! Don't miss this valuable resource brought to you by K-State Research and Extension. Hard copies will be available soon.

weed control publication  

Marestail in soybeans: Strategies for the best control

Controlling marestail in soybeans continues to be a big challenge for Kansas no-till producers. Application timing and weed size are critical factors for successful control of this weed that germinates in the fall or early spring.

soybeans weed control marestail 

Pay attention to growth stage for spring herbicide decisions on wheat

Producers should pay close attention to the growth stage of their wheat before making spring herbicide applications. Some herbicides must be applied after tillering, several must be applied before jointing, and others can be applied through boot stage.

wheat weed control 

Pre-emergence herbicides for corn

Applications of pre-emergence herbicides at or before corn planting are important to minimize yield losses to early-emerging weeds. Learn more about this weed management practice in this article.

corn weed control pre-plant herbicide 

Weed management considerations for flooded fields

Many fields across Kansas and neighboring states were covered by flood waters during portions of 2019. These fields may need special considerations when it comes to weed management.

weed control flooded fields 

Considerations for pre-emergence herbicides

Pre-emergence, soil-active herbicides applied around the time of planting are an important part of a good weed management program. However, variability in spring weather leads to concerns about both weed control and crop injury.

weed control herbicide pre-emergence crop injury 

Pre-harvest weed control in wheat

Drought and late freezes have impacted wheat stands in many areas across Kansas this year. As a results, weeds are showing up and taking advantage of thin wheat stands. What are the best options for weed control at this point in the season?

wheat weed control herbicide carryover pre-harvest 

New study evaluated different herbicide programs for Palmer amaranth control in post-harvest wheat stubble

A field study was recently conducted that evaluated the performance of various herbicide programs for Palmer amaranth control in post-harvest wheat stubble. Learn more about the results of this research in this article from Weed Scientist, Dr. Vipan Kumar.

wheat weed control palmer amaranth post-harvest 

Considerations for weed control following wheat harvest

Post-harvest weed control in wheat stubble is very important to conserve soil moisture and prevent weeds from going to seed and adding to the weed seedbank. Weeds are likely to be growing quickly, especially where there are thin stands.

wheat weed control post-harvest 

Post-wheat harvest weed control in dryland cropping systems

Controlling weeds is key in order to maximize the benefits of stubble and no-till dryland cropping systems in western Kansas. Read more about the effects of weed control timing after wheat harvest in this article.

weed control dryland post-wheat harvest 

In-season Palmer amaranth control in grain sorghum

With adequate moisture and high temperatures, Palmer amaranth populations are rapidly growing and causing concern for some sorghum producers in western Kansas. What options to growers have at this point in the growing season? Read more in the article from weed scientist Dr. Vipan Kumar.

grain sorghum weed control palmer amaranth post-emergence 

Control annual weeds with fall-applied herbicides ahead of corn and sorghum

With row crop harvest well underway, it is time to start planning fall herbicide applications. Herbicide applications in late October through November can improve control of difficult winter annual weeds.

fall-applied weed control marestail residual herbicides annual weeds 

Stop spreading weed seed during harvest activities

Be mindful of the many ways that weeds can spread from field to field, including hitching a ride on harvest equipment. Learn what steps can be taken to minimize spreading weed seeds during harvest activities.

weed control harvest weed seeds 

Update: 2021 soybean planting intentions survey - Producer input requested

There is still time to participate in a short survey concerning your soybean planting intentions for the 2021 season. This survey will help guide winter extension programming and is completely anonymous.

survey weed control soybean planting 

IMIFLEX herbicide receives EPA approval for igrowth grain sorghum

As of late December, grain sorghum farmers have access to IMIFLEX™ herbicide to use in igrowth® grain sorghum for the 2021 growing season. Read more about the target weeds, use rates, and rotation intervals in this article.

grain sorghum weed control herbicide resistance IMIFLEX 

Extension Weed Science launches a new podcast on battling weeds

Weed Science Extension specialists have teamed up to launch a new podcast about the ongoing fight to control weeds. The first episode of "War Against Weeds" is available online with more episodes to follow. Check it out!

weed control podcast War on Weeds 

Pre-plant herbicide applications for kochia control

Now is the time to finalize plans for kochia control. Recent research suggests that kochia can begin emerging in early February with most kochia emerging by early April. This article will be the first in a series discussing specific options for various cropping systems.

weed control kochia pre-plant herbicide 

Late winter kochia control in fields going to corn or grain sorghum

Last week, we shared some general information about applying pre-emergence herbicides for kochia control. In this article, the focus is on specific recommendations for fields going to corn or grain sorghum this growing season.

weed control kochia pre-emergence 

Late winter kochia control in fields going to soybeans, sunflowers, and wheat

This is the third and final article in a series discussing pre-emergence herbicides for kochia control. For this article, we cover recommendations specific to fields that will be planted to soybean or sunflower this spring and wheat in the fall.

weed control kochia herbicide pre-emergence 

Marestail in soybeans: Strategies for the best control

Controlling marestail in soybeans continues to be a big challenge for Kansas no-till producers. Learn about early spring, pre-plant, and post-emergence options for treatment in this article from Extension Weed Science Specialist, Dr. Sarah Lancaster.

soybeans weed control pre-plant herbicide marestail post-emergence 

Residual herbicides for corn

Residual herbicides that kill weed seeds/seedlings as they germinate or emerge are an important component of herbicide applications at or before the time of corn planting. Learn about the different options in this article from Weeds Specialist Sarah Lancaster.

corn weed control pre-emergence residual herbicides 

Pre-emergence herbicides for grain sorghum

With few post-emergence herbicide options for control of grass species and Palmer amaranthl in grain sorghum, having an effective pre-emergence herbicide program is very important. Learn more about the different soil-applied residual herbicides in this article.

grain sorghum weed control pre-emergence residual herbicides 

Survey: Herbicide application practices in Kansas

If you did not get a chance to participate in a short survey about your herbicide application practices back in February, you have another chance! Help out the Extension Weed Science Team and fill out this short survey! Thank you!

survey weed control herbicide herbicide application 

Early-season weed control in cotton

Early season weed control is particularly important in cotton as it can be slow to develop a crop canopy. Learn the best strategies for keeping weeds at bay in your cotton fields this spring and summer.

weed control cotton pre-plant herbicide residual herbicides 

Pre-harvest weed control in wheat

Herbicide applications that will not directly influence crop yield can be a tough choice to make. There are some indirect benefits to pre-harvest herbicide applications in wheat, especially in fields with a high weed density. Learn more about this management practice in this article.

wheat weed control herbicide application pre-harvest 

Considerations for weed control following wheat harvest

Post-harvest weed control in wheat stubble is very important to conserve soil moisture and prevent weeds from going to seed and adding to the weed seedbank. Weeds can grow quickly once the wheat canopy is removed.

weed control kochia palmer amaranth volunteer wheat post-harvest 

Cover crop response to herbicides

As September begins, some producers are thinking about seeding winter cover crops in fields currently planted to corn. The successful establishment of winter cover crops is influenced by several factors. This article provides some additional details about cover crop responses to various herbicides.

weed control cover crops herbicide termination herbicide injury 

Weed management, weed escapes, and targeted control practices survey

A collaborative research project is underway with weed scientists from Kansas State, University of Nebraska, and University of Wisconsin. As part of this effort, they have created a survey for growers, consultants, and extension personnel.

survey weed control  

Get control of fall-emerged marestail before next spring

Marestail or "horseweed" is a challenging weed to manage in no-till or minimum till systems. Fall-emerged marestail can be difficult to control if allowed to grow until planting in the following spring. Different control options are available for use in the fall while plants are still small.

weed control marestail herbicide resistance residual herbicides 

Weed management, weed escapes, and targeted control practices survey

A collaborative research project is underway with weed scientists from Kansas State, University of Nebraska, and University of Wisconsin. As part of this effort, they have created a survey for growers, consultants, and extension personnel. Learn how to participate in this effort in this article.

survey weed control  

Musk thistle control in the fall

Musk thistle (is one of 12 noxious weeds in Kansas infesting nearly 500,000 acres. Control efforts should be aimed at reducing or eliminating new populations and established stands should be managed with any accepted control method. Fall is an excellent time to spray musk thistle.

pastures weed control musk thistle noxious weed 

Control of mustards in wheat - Timely treatment is important

Too often producers do not notice mustard weeds in their wheat fields until the mustards start to bloom in the spring. To minimize yield losses, mustards should be controlled by late winter or very early spring, before the stems begin to elongate, or bolt.

wheat mustards weed control herbicide timing 

Plan now for weed management in 2022

Harvest is always a great time to start planning weed management strategies for the next spring. Forming a plan now to address needs for next spring is especially important this fall due to the anticipated shortages of key herbicides. Learn what you can do to minimize the impact of a possible chemical shortage.

weed control herbicides glyphosate 

Late winter kochia control in fields going to corn or grain sorghum

Last week, we shared some general information about applying pre-emergence herbicides for kochia control. This article focuses on specific recommendations for fields going to corn or grain sorghum this growing season.

grain sorghum corn weed control kochia 

Prohibition for Enlist One and Enlist Duo lifted for Kansas

Enlist One and Enlist Duo amended supplemental labels were approved on March 29 to allow use in 10 counties in Kansas (Chautauqua, Cherokee, Cowley, Elk, Greenwood, Labette, Montgomery, Neosho, Wilson, and Woodson)

weed control label requirements enlist 

Weed Management Podcast Wrapping up Third Season

Season three of “War Against Weeds” podcast is on going adding eleven new episodes since January. Season three episodes have included topics that range from kochia biology and management to the influence of the Endangered Species Act enforcement on weed management.  Episodes remaining for season three include an update on herbicide resistant weed research and a discussion about using drones for weed management. Episodes are approximately 30 minutes long and free to access. They are posted at https://waragainstweeds.libsyn.com/

weed control podcast War on Weeds 

Control of later-emerging kochia in wheat or wheat stubble

Getting kochia under control in any cropping system that includes wheat begins with the wheat crop during the spring, and shortly after wheat harvest. This is not always easy, even if early spring herbicide applications for kochia control were made. While a majority of kochia emerges early in the spring, emergence can extend over a period of weeks or months. A herbicide applied early in the spring will need to have residual activity to be effective on later-emerging kochia.

weed control kochia wheat stubble 

Pre-harvest weed control in wheat

Making a herbicide application that will not directly influence crop yield is a difficult decision to make. Such is the case with pre-harvest weed control applications to wheat fields. However, pre-harvest applications may be beneficial, especially in wheat fields with short or thin stands or fields that were not treated earlier in the season. When broadleaf weeds grow rapidly at the end of the growing season, several potential concerns arise such as harvest difficulties, dockage problems, weed seed production, and soil water depletion.

wheat weed control pre-harvest 

Considerations for weed control following wheat harvest

Post-harvest weed control in wheat stubble is very important to conserve critical soil moisture and prevent weeds from going to seed and adding to the weed seedbank. This year, it will be especially important to be ready to spray after wheat harvest because of less cover from shorter and thinner wheat than we have seen in the last few years in many areas. When thinking about weed control in wheat stubble, there are two priorities – controlling already emerged weeds and preventing later flushes.

wheat weed control 

World of Weeds: Jointed goatgrass (Aegilops cylindrica)

This World of Weeds feature will discuss this weedy relative of wheat, also know as joint goat grass. Jointed goatgrass is a winter annual that germinates roughly the same time as winter wheat and the rate of development of the two species is similar throughout the growing season. It is native to southern Europe and is thought to have been introduced in Kansas during the 1900s as a contaminant in imported wheat. It can be found in a variety of habitats, including roadsides, rights of ways, and fields throughout much on the United States, including all of Kansas.

wheat weed control World of Weeds 

K-State Weed Science Field Day - July 13

The Department of Agronomy is hosting a Weed Science Field Day! This free event provides an opportunity to browse extension weed science herbicide evaluation trials, network with K-State Weed Science faculty and industry representatives, learn more about weed management and new sprayer technology, and receive 1A credit. Sign-up by July 5!

weed control Field Day  

Pre-emergence herbicides for wheat

Residual herbicides applied prior to wheat emergence can be part of a good weed management system in wheat production. Field bindweed is a particularly troublesome weed that can greatly reduce wheat yield. Learn the best strategy for bindweed control in this article.

wheat weed control bindweed pre-emergence residual herbicides 

Weed management practices: Fall scouting and equipment cleaning

Weed management encompasses more than controlling actively growing weeds. Farmers can be proactive to help prevent the future spread of weeds. Two different management practices are discussed in this article: fall scouting for weed escapes and equipment cleaning.

weed control scouting weed management 

Musk thistle control in the fall

Musk thistle is one of 12 noxious weeds in Kansas infesting nearly 500,000 acres. Control efforts should be aimed at reducing or eliminating new populations and established stands should be managed with any accepted control method. Fall is an excellent time to treat musk thistle since they are in the rosette stage of growth.

weeds weed control musk thistle noxious weed 

Control of mustards in wheat - Timely treatment is important

Mustard weeds in wheat fields often are not noticed until the they start to bloom in the spring. Mustards are much more difficult to control once they have flowered and often have already reduced wheat yields. To minimize yield losses, mustards should be controlled by late winter or very early spring.

mustards weed control application training wheat herbicide timing 

Weed management schools for cropland and pastures in eastern Kansas - Jan. 23 and 24

The Department of Agronomy, in conjunction with the Frontier, Southwind, and Wildcat Extension Districts, is hosting three weed management schools on Jan. 23 and 24. These schools will focus on timely and relevant weed management strategies specific for eastern Kansas.

weed control meeting  

K-State weed management schools in northwest and north central Kansas - Feb. 15 and 16

Mark your calendar for one of the K-State Weed Management Schools to be held at four locations across northwest and north central Kansas in mid-February. The weather of 2022 led to many challenges controlling difficult weeds. Get the latest weed control information from K-State and UNL specialists by attending.

weed control meeting  

Pre-plant herbicide applications for kochia control

Kochia can begin emerging in early February with most kochia emerging by early April. Kochia seedlings emerge in dense populations that make adequate herbicide coverage difficult. It is important to apply pre-emergence herbicides in late winter or early spring to control this weed before it emerges.

weed control kochia pre-plant herbicide 

Cover crop termination considerations

Now is the time to begin considering how to terminate winter cover crops in preparation for summer crops. There are some cover crop species that will survive the winter and need to be terminated by mechanical or chemical methods in the spring. Learn more about cover crop termination methods and timing in this article.

weed control cover crops 

Residual herbicides for corn

Residual herbicides that kill weed seeds/seedlings as they germinate or emerge are an important component of herbicide applications at or before the time of corn planting. Many cases of herbicide-resistant weeds have resulted from over-reliance on post-emergence herbicide applications, thus it is essential to include one or more residual herbicides available for corn.

corn weed control pre-emergence residual herbicides 

Weed management considerations for thin wheat stands

Prolonged drought in much of Kansas has resulted in marginal wheat stands and a difficult decision for many farmers, especially with reasonably strong prices. Thin wheat stands will require residual herbicides to limit competition from weeds. However, if the field might be planted to another crop this spring, some residual herbicides will limit options for a subsequent crop. Learn more in this article.

weed control wheat poor emergence thin wheat 

Control of late-emerging kochia in wheat or wheat stubble

Getting kochia under control in any cropping system that includes wheat begins with the wheat crop during the spring, and shortly after wheat harvest. This is not always easy, even if early spring herbicide applications for kochia control were made. Learn more in this article from Sarah Lancaster, K-State Weed Science Specialist.

wheat weed control kochia wheat stubble 

Early-season weed control in cotton

Early-season weed control is especially important in cotton because can be slow to canopy relative to other crops grown in Kansas, and therefore less competitive early in the growing season. Tillage is often used for early-season weed control; however, most Kansas cotton acreage is in conservation tillage systems, so effective herbicides are needed before planting.

weeds weed control cotton residual herbicides burndown herbicides 

Pre-harvest weed control in wheat

Short, thin wheat stands are generating questions about weed control at this point in the growing season. Broadleaf weeds that grow rapidly at the end of the growing season present several potential concerns. Once wheat has reached the boot stage, there are no herbicide options until wheat begins to dry down and herbicides can be applied as harvest aids.

wheat weed control pre-harvest 

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soybeans weed control volunteer corn 

Plan now for volunteer corn control

Volunteer corn may or may not be considered a weed, but it does pose problems in some fields. One of the factors that makes volunteer corn management difficult is the prevalence of glyphosate and/or glufosinate resistance. There are some steps farmers can take early in the growing season to manage volunteer corn.

weed control volunteer corn 

Early summer control of sericea lespedeza using herbicides

Sericea lespedeza is a major invasive species of concern on rangeland, pasture, and some CRP acres in Kansas. This Category C noxious weed infests over 465,000 acres in Kansas. Control efforts should be directed at reducing or eliminating new infestations as well as using approved control methods on established populations.

weed control rangeland sericea lespedeza noxious weed 

Update: Pre-harvest weed control in wheat

This year’s short, thin wheat crop, coupled with late-season rains has resulted in a lot of questions about the best approach to managing large weeds in mature wheat. This article was originally published earlier this season and now has some updated information regarding herbicides labeled for use as harvest aids.

wheat weed control pre-harvest 

Controlling weeds after wheat harvest

When thinking about weed control in wheat stubble, there are two priorities – controlling already emerged weeds and preventing later flushes. Weeds that have been suppressed by the canopy will grow rapidly once crop competition is removed. Delaying control can result in lost soil moisture that could be used for crop production, as well as weed seed production.

weed control wheat post-harvest 

Palmer amaranth control in grain sorghum

When the aggressive nature of Palmer amaranth is combined with the limited post-emergence herbicide options in grain sorghum, problems often arise – even when an adequate pre-emergence herbicide program is used. This article covers post-emergence herbicide options for Palmer amaranth control in grain sorghum.

sorghum grain sorghum weed control palmer amaranth 

Pre-emergence herbicides in wheat

Pre-emergence herbicides with residual activity are an important component of high-yielding cropping systems. While used less frequently compared to other cropping systems, residual herbicides applied prior to wheat emergence can be part of a good weed management system in wheat production.

wheat weed control pre-plant herbicide pre-emergence residual herbicides 

Self-guided tours of herbicide evaluation plots are open near Manhattan

Each summer, the Extension Weed Science team evaluates herbicide programs for corn and soybeans. This year, those plots are available for viewing by interested individuals who are passing through the Manhattan area. The plots will be open until harvest is completed near the end of September. Check them out!

weed control weeds plots 

World of Weeds - Asiatic Dayflower and Erect Dayflower

The next weed to be featured in our World of Weeds series is the common dayflower, specifically the Asiatic dayflower and the erect dayflower. Dayflowers are generally found in shady areas with moist soils. Check out this article to learn how to identify these weeds and how to control them if needed.

weed control World of Weeds weeds dayflower 

Musk thistle control in the fall

Musk thistle is one of 12 noxious weeds in Kansas, infesting over 420,000 acres in 2022. Control efforts should be aimed at reducing or eliminating new populations, and established stands should be managed with any accepted control method. Fall is an excellent time to spray musk thistle as all are in the rosette growth stage.

weed control musk thistle noxious weed 

Preplant herbicide applications for kochia control

Now is the time to finalize plans for kochia control. In western Kansas, kochia is among the first summer annual weed to emerge in the spring. In fact, emerged kochia has been confirmed in fallow plots near Garden City in the first week of February this year. Good control of the first dense flush of kochia is essential for obtaining a good yield.

weed control kochia pre-plant herbicide 

Late winter kochia control in fields going to corn or grain sorghum

Last week, we shared information about pre-emergence herbicides for kochia control. This week, we focused on specific options for fields going to corn or grain sorghum this growing season. It is critical to start the growing season with clean fields.

grain sorghum corn weed control kochia pre-plant herbicide 

Late winter kochia control in fields going to soybeans, sunflowers, and wheat

This is the third and final article discussing pre-emergence herbicides for kochia control. This week, we will discuss recommendations specific to fields planted to soybeans or sunflower this spring and wheat in the fall.

wheat soybeans weed control kochia pre-emergence sunflowers 

Residual herbicides for corn

Residual herbicides that kill weed seeds and/or seedlings as they germinate or emerge are important for herbicide applications at or before corn planting. These herbicides can control weeds for several weeks, which prevents yield loss due to early-season weed competition.

corn weed control pre-emergence residual herbicides 

Pre-emergence herbicides for soybeans

Pre-emergence herbicides are the foundation of any excellent weed control program in soybeans. Using multiple effective residual herbicides is important to broaden the spectrum of controlled weeds, ensure herbicide activation in various environments, and guard against herbicide resistance.

soybeans weed control pre-emergence residual herbicides 

Weed resistance to WSSA Group 2 herbicides is widespread: What do growers need to know?

Weed resistance to WSSA Group 2 herbicides is a global challenge that all growers, including those of major crops in Kansas, must be aware of. This crucial issue directly impacts their crop management strategies and overall productivity.

weed control herbicide resistance Group 2 herbicides 

Pre-harvest weed control in wheat

A warm spring this year has resulted in rapidly maturing wheat. There have been some questions about spraying herbicides on wheat that has already headed. This article discusses herbicide options for wheat that serve as harvest aids. Pre-harvest applications may be beneficial this year to prevent harvest difficulties, dockage problems, weed seed production, and soil water depletion due to weeds.

wheat weed control herbicide application pre-harvest harvest aid 

Metabolic resistance: A pressing threat requiring immediate action

Multiple herbicide-resistant weeds such as Palmer amaranth and kochia are a real threat to growers in Kansas. The rapid and widespread evolution of multiple herbicide resistance in weed species due to the increased capacity to degrade herbicides threatens herbicide sustainability and global food production. Learn more in this article.

weed control herbicide resistance metabolic resistance 

Early season weed control in cotton

Early season weed control is especially important in cotton because it can be slow to canopy relative to other crops grown in Kansas and is, therefore, less competitive early in the growing season. Weeds compete for resources during the season and contribute to trash and discoloration of the lint at harvest, resulting in major dockage in quality grades and reduced lint value.

weed control cotton pre-emergence residual herbicides 

World of Weeds - Field bindweed

Field bindweed is a perennial vine in the morning glory family that infests millions of acres in the Great Plains. This weed significantly reduces crop yield and quality, reduces land value, interferes with harvest by entangling crop plants, and increases production costs associated with control practices.

weed control World of Weeds bindweed field bindweed 

Management options for control of field bindweed

Last week's eUpdate featured an article on field bindweed focusing on its ecology, growth characteristics, and identification methods. This week, the focus is on developing effective long-term control strategies for this troublesome weed that impacts Kansas farmers. A good control program will include cultivation, herbicide use, and competitive crops.

weeds weed control bindweed field bindweed 


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