Consider fall treatments for control of marestail in soybeans
weeds fall-applied weed control herbicide marestail soybeans
Palmer amaranth resistance to 2,4-D and dicamba confirmed in Kansas
planting weed control herbicide dicamba palmer amaranth weeds
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.
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.
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.
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.
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.
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.
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.
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?
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.
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.
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.
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.
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.
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.
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.
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!
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.
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.
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.
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.
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!
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.
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.
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.
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.
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.
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.
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.
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.
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 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/
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.
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.
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.
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.
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!
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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!
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.
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.
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.
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.
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.
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.
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.
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.