Difficult to control weeds – whether due to herbicide resistance or cut rates or too tall weed height/maturity or all of the above – must be taken very seriously and moved to the top of your agronomy to-do list for 2014....More
There's a new weed identification mobile app available for download. The Ag Weed ID app offers an image library, as well as control measures for about 75 of the most common weeds in a variety of crops, including corn and soybeans.
To manage Palmer amaranth weeds, growers must prevent the spread of the seed, or the weed; use multiple herbicide applications to control; and have a zero threshold of plants after control measures....More
Herbicide resistance doesn't develop overnight. By repeatedly applying the same herbicide or herbicides that use the same mode of action, weed resistance pressure increases. Farmers can take a proactive approach to weed management to tackle the weed resistance problem.
Long past are the days of tossing in a little crop oil or surfactant in a spray mix. Selecting the right adjuvant is increasingly important today. However, complex herbicide mixes to fight resistant weeds make proper adjuvant selection a critical part of a successful crop protection program....More
An article published in the recent issue of Weed Science showed that glyphosate-resistant Palmer amaranth weeds are strong, persistent plants due to amplification of the EPSPS gene. This means that glyphosate resistance will probably persist and farmers will be faced with finding different methods of removing Palmer amaranth from their fields....More
When choosing a spring application, growers should expect a residual herbicide to deliver several weeks of weed control, cover a broad spectrum of weeds, aid in resistance management and allow for crop rotation flexibility....More
"Insurance companies often have a pollution exclusion that they claim eliminates general liability and umbrella coverage for spray drift," warns Jean Sieler, Robison, Curphey & O'Connell, LLC. "Even if the policy covers drift via a specific rider, typically with a specific coverage limit, it may be an 'eroding' rider that allows them to deduct their legal costs."...More
The USDA Animal Plant and Health Inspection Service (APHIS) is seeking review and comment from the public on the possibility of deregulating corn and soybean seed that’s resistant to 2,4-D, among other herbicides....More
Corn and soybean farmers test-drove several new herbicides over the rugged proving ground of the 2013 growing season. The new active ingredient pyroxasulfone appears in three new products: Zidua, Anthem and Fierce.
Consider a three-way look at your crop — from above and below and at ground level. That means a close-up look at plant roots and soil for clues to plant growth, plus aerial images to detect, confirm and define a problem....More
An important component of managing weeds in field crops is preventing the seeds released by weeds each autumn from becoming new plants. Nature assists in the loss of weed seed through predation, decay and loss of viability. Integrated weed management strategies that facilitate these processes can lead to high levels of weed seed loss....More
More adverse spring weather and the northern spread of herbicide-resistant marestail find more reduced-tillage farmers considering fall residual herbicide applications. “Fall applications have risen dramatically in the last few years and will continue to grow,” says Regan Wear, CHS agronomy manager in Shipman, Ill. “Erratic, wet, cold springs have narrowed the planting window and fueled interest in fall residual herbicide applications because they really sharpen up timing the following spring.”...More
You plan years ahead for crop rotation, fertilizer and machinery acquisitions. Since the rise of glyphosate-resistant weeds, you should be doing the same for your herbicide program, says Lisa Behnken, a Minnesota Extension crops specialist....More
The University of Illinois Extension has received many questions about applying herbicides post-harvest to control emerged marestail plants. Fall-applied herbicides often provide more effective and consistent control of emerged marestail as compared with spring-applied (i.e., burndown) herbicides, says Aaron Hager, weed specialist with U of IL Extension. Here are tips from the Extension service for fall-applying herbicide to control emerged marestail....More
With corn and soybean harvest underway in all major producing states, farmers are thinking about herbicide applications this fall. Aside from weed management, there are other factors to be considered when applying herbicide after harvest including: spring weather uncertainty, impact on soil conditions, pest interactions....More
Before you run that combine through every acre of your fields, I’d highly recommend reading “Resistant Palmer amaranth hits the Midwest." This weed is a game changer, and if left unchecked without multiple herbicide modes of control, you can literally lose a field in three years’ time....More
On July 6, 2011, Joe Steinkamp changed his entire weed-management program. Steinkamp raises seed soybeans and white corn on Ohio River bottomland near Evansville, Ind. On that July day two years ago, his neighbor brought over some weeds that had survived Roundup. “He said, ‘Joe, do you know that these are?’ I said, ‘I sure do!’ ”...More
Recently, populations of Palmer amaranth have been identified in several Illinois counties. The density of many populations is relatively low, and often these plants occur only in small patches. However, a few scattered plants this year can lead to severe infestations within only a few years....More
Recently there have been several inquiries about the presence of glyphosate-resistant volunteer soybeans in corn fields and cost-effective control options. These volunteers emerge from seed that shattered before soybean harvest or fell during combining. Historically, soybeans are not considered a serious volunteer weed problem in corn because they are not very competitive and several herbicide options are available to control them in corn....More
When weeds become resistant to herbicides, the advantage of growing herbicide-resistant crops is lost. Farming practices that limit the emergence of resistant weeds offer another means of control and thwart weeds’ effect on soybean crop production. Finding the right combinations of weed control methods can improve yields and reduce dependence on chemical weed control....More
Early-season weed competition resulted in as much as 40-bu./acre yield loss according to data found in some South Dakota State University Research Plots. "Everyone knows that weeds in fields create competition for water and nutrients and can cause significant yield loss, but many neglect the effects of just early-season weeds on crop yield," says Mark Rosenberg South Dakota State University agronomy and weeds field specialist....More
It’s another post-emergence application (post) soybean season, and we have largely been receiving questions similar to the past several years. These include how to manage giant ragweed, pokeweed and a few other perennials, vines and marestail (good luck there)....More
The weed science program at the University of Illinois is offering free screenings for herbicide resistance in waterhemp to Illinois farmers during the 2013 growing season. Aaron Hager, associate professor of weed sciences at U of I, says with continued financial support from the Illinois Soybean Association, over 1,000 plant samples have been screened through the collaborative effort between the U of I and the ISA....More