 |
|
Herbicide diversity needed to keep Roundup effective
July 14, 2009WEST LAFAYETTE, Ind. - Using a diverse herbicide application strategy may increase production costs, but a five-year Purdue University study shows the practice will drastically reduce weeds and seeds that are resistant to a popular herbicide.
Excess usage of glyphosate-resistant crops has led to weeds, such as marestail, that also are resistant to glyphosate, the herbicide used in Roundup. Bill Johnson, a Purdue associate professor of weed science, said changing management practices can almost eliminate resistant marestail and its viable seeds in the soil.
"Another herbicide application is expensive, and it means more trips across the field," Johnson said. "But we can reduce the population and density of resistant weeds, which increases the crop yield potential."
The results of Johnson's five-year study were published in the journal Weed Science.
Marestail, also known as horseweed, was the first weed to develop resistance to glyphosate. Other weeds also are adapting, Johnson said, reducing the effectiveness of products such as Roundup, the most widely used herbicide on the market.
It is Roundup's popularity that is contributing to its diminished effect. Johnson said farmers have come to rely on Roundup Ready crops that resist glyphosate as an easy way to control weeds. But overuse of any herbicide allows weeds to adapt and develop resistance.
Johnson's study found that farmers should diversify the herbicides they use. Using a variety of herbicides in addition to Roundup before planting and alternating between Roundup and other herbicides in corn can significantly reduce marestail.
Fields that had three resistant weeds for every susceptible weed while using only Roundup and Roundup Ready crops saw weed populations drop to one resistant weed for every six susceptible weeds while rotating herbicides as Johnson suggests. That rotation also may lead to a 95 percent decrease in the number of viable marestail seeds in the soil.
Continuing with only Roundup and Roundup Ready crops can intensify the problem, Johnson said.
"Glyphosate-resistant marestail develops very quickly in a field. Populations reach staggering levels of infestation in about two years after it is first detected," Johnson said. "For us, marestail being the first weed that developed resistance showed that a weed-management system that is solely reliant on glyphosate is starting to break down. However, a system that incorporates other herbicides with glyphosate can be sustainable for quite some time."
The Indiana Soybean Alliance, BASF, Dow AgroSystems, Monsanto and Syngenta funded Johnson's study. His next step is looking at management strategies that reduce the prevalence of other weeds that have built up resistance to glyphosate.
Purdue University
The results of Johnson's five-year study were published in the journal Weed Science.
Marestail, also known as horseweed, was the first weed to develop resistance to glyphosate. Other weeds also are adapting, Johnson said, reducing the effectiveness of products such as Roundup, the most widely used herbicide on the market.
It is Roundup's popularity that is contributing to its diminished effect. Johnson said farmers have come to rely on Roundup Ready crops that resist glyphosate as an easy way to control weeds. But overuse of any herbicide allows weeds to adapt and develop resistance.
Johnson's study found that farmers should diversify the herbicides they use. Using a variety of herbicides in addition to Roundup before planting and alternating between Roundup and other herbicides in corn can significantly reduce marestail.
Fields that had three resistant weeds for every susceptible weed while using only Roundup and Roundup Ready crops saw weed populations drop to one resistant weed for every six susceptible weeds while rotating herbicides as Johnson suggests. That rotation also may lead to a 95 percent decrease in the number of viable marestail seeds in the soil.
Continuing with only Roundup and Roundup Ready crops can intensify the problem, Johnson said.
"Glyphosate-resistant marestail develops very quickly in a field. Populations reach staggering levels of infestation in about two years after it is first detected," Johnson said. "For us, marestail being the first weed that developed resistance showed that a weed-management system that is solely reliant on glyphosate is starting to break down. However, a system that incorporates other herbicides with glyphosate can be sustainable for quite some time."
The Indiana Soybean Alliance, BASF, Dow AgroSystems, Monsanto and Syngenta funded Johnson's study. His next step is looking at management strategies that reduce the prevalence of other weeds that have built up resistance to glyphosate.
Purdue University
Herbicide Current Events and Herbicide News RSSTurfgrass quality measurement improved with GreenSeeker sensor
To measure turfgrass performance, professionals have traditionally relied on trained human evaluators who provide visual assessments of turf quality.
Organic weed control for dandelions
Spring and summer often find homeowners out in their yards, busily attempting to control the onslaught of dandelions in a quest for green, weed-free lawns.
Understanding how weeds are resistant to herbicides
In a little over seven hours, University of Illinois weed scientist Patrick Tranel got more genetic information about waterhemp than in two years time in a lab.
Leicester research paves way for first use in Europe of an insect to fight invasive plant
Researchers at the University of Leicester have paved the way for the first ever use in Europe of an insect (biocontrol) to combat an invasive plant species in Britain.
Alternative agricultural practices combine productivity and soil health
The progressive degradation of useful soils for agriculture and farm animal husbandry is a growing environmental and social problem, given that it endangers the food safety of an increasing world population.
Limited data suggest possible association between Agent Orange exposure
A new report from the Institute of Medicine finds suggestive but limited evidence that exposure to Agent Orange and other herbicides used during the Vietnam War is associated with an increased chance of developing ischemic heart disease and Parkinson's disease for Vietnam veterans.
First evidence that weed killers improve nutritional value of a key food crop
Scientists are reporting for the first time that the use of weed killers in farmers' fields boosts the nutritional value of an important food a crop.
Iowa State University researcher looks at the future of agriculture
Dramatic price fluctuations, increasing demand, the food vs. fuel debate, and other events of the past year may have food producers wondering which way is up.
Researchers describe 'implausible' chemistry that produces herbicidal compound
A soil microbe that uses chemical warfare to fight off competitors employs an unusual chemical pathway in the manufacture of its arsenal, researchers report, making use of an enzyme that can do what no other enzyme is known to do: break a non-activated carbon-carbon bond in a single step.
Managing Douglas-fir forests for diversity
Creating diverse forests for multiple uses is important to natural resource managers and landowners.
More Herbicide Current Events and Herbicide News Articles
 |
Monterey Remuda All Natural Herbicide - Pint Concentrate #LG5180 by Monterey PT, Concentrate, Remuda, A Non-Selective Post Emergence Herbicide To Use In Unplanted Areas, Around Trees & Shrubs, Flowerbeds, Etc, Contains 41% Glyphosate With Surfactant, Can Be Mixed With Weed Impede To Get A Post Emergent Kill & A Pre-Emergence Control Of Weeds & Grass. |
|
Herbicides and Plant Physiology by Andrew Cobb (Author), John Reade (Author) Herbicides continue to make a spectacular contribution to modern safe crop production. It is essential to understand how these compounds work in plants and their surroundings to properly facilitate the development of more effective and safer agrochemicals. This book provides that information in a succinct and user-friendly way. The second edition of this very well-received and highly thought of book has been fully up-dated with much new information of relevance to the subject, particularly in the areas of cell and molecular biology. The book commences with introductory chapters on weed biology and herbicide discovery and development. Following chapters include coverage of herbicides that inhibit photosynthesis and auxin-type herbicides, herbicide resistance and further targets for... | |
 |
Nature's Avenger Organic Weed & Grass Killer 32oz Concentrate by CUTTING EDGE FORMULATION INC Natures Avenger is a non-selective herbicide that works by dehydrating the weed or grass all the way down to the root. Additional Details Citrus, oil-based herbicide designed to kill broadleaf weeds and grasses Safe for kids, pets, and the water supply Works faster than many of the leading toxic chemical herbicides on the market In most cases, noticeable results can be seen within hours after spraying 32oz concentrate bottle makes up to 1.5 gallons ready to use |
|
Planfarm Herbicide Guide by Planfarm Pty Ltd The guide covers all the important aspects of weed and pest management for winter crops in WA. It is designed and produced independently by consultants for farmers to help them make the best decision when it comes to chemical application. | |
 |
Brushmaster Herbicide Quart by PBI Gordon Brushmaster is an economically priced low-volatile ester product containing a Trimec herbicide complex that allows you to successfully treat just about any brush or broadleaf weed species. Whether you apply it with water or mix it with oil, Brushmaster's superior penetration and translocation give it the power to extinguish the last spark of life from your toughest brush. Properly treated, targeted trees, vines and broadleaf weeds won't come back. Most cool season grasses are tolerant to applications of Brushmaster when mixed with water for folier treatments. Will not strip treated areas of erosion protection like mechanical methods and chemical sterilent and will breakdown rapidly in the soil making it a sound choice for brush control that is not only efficient, but cost effective as... |
 |
AM25 Aquamaster Aquatic Herbicide by A.M. Leonard |
|
FINALE HERBICIDE - 2.5 GALLO * by Southern States Farm Supplies | |
 |
Whitetail Institute Slay Broadleaf Herbicide 1 Pint Whitetail Institute Slay Broadleaf Herbicide 1 Pint Slay the Broadleaf Weeds in Your Food Plot Slay herbicide was developed by the Whitetail Institute to help control broadleaf weeds. Like grasses broadleaf weeds come in many shapes and forms both perennials and annuals. Thistles dock weed and ragweed are examples of broadleaf weeds that can damage or even destroy food plots. Broadleaf weeds like grasses can spread quickly and take valuable moisture and nutrients from the soil. They can also damage food plots by shading out the desired forages. This is especially true when the plantings are young. Slay herbicide effectively controls broadleaf weeds while not harming Imperial Whitetail Clover or Alfa-Rack and many other food plot plantings. Slay Broadleaf Herbicide is effective on... |
 |
Historic Crop Dusting Films DVD: 1947 - 1969 Agricultural Pesticides, Insecticides, & Herbicides Films Including Pesticide, Herbicide, Insecticide Use, Application, Pollution, & Effects Videos. Topics Also Include Pest Control, Insects, Weeds, DDT, Cropdusting Aircraft, And More. Great collection of three agriculture pesticide application films including crop dusting, insecticide/pesticide application methods, DDT application, and pests like the boll weevil. Table Of Contents: (1) Death to Weeds (1947) - Documentary film about the application of 2-4-D pesticide including crop dusting and before and after footage - 22 Minutes (2) Agricultural Aviation (1955) - Historical footage of crop dusting and pesticides application including up close footage of the various pests that damage farmers plants, like boll weevils - 13 Minutes (3) Who Shall Reap (1969) - The problems and solutions that insects and weeds contribute to farmers and food supplies - 28 Minutes |
|
Herbicide "Trombonist Herb Bruce is a musician so gifted, it's impossible to classify his playing. He can soar, he can roar, he can be sweet and sensitive, or he can raise the hairs on your arms with his robust intensity and vibrant sound. Herb covers every style, and proudly displays his ability on this recording. To match his enthusiasm and his exciting playing, Herb has assembled a big band with an even bigger sound. Add to that some lush strings for the ballads and some percussion for the pop tunes, and you have a record that covers all the bases. Herb does it all, and does it well. This CD will have you wondering why there is only one recording of this great ensemble. With such fine arrangements, terrific players, and a trombone leader who seems to have no limitations, this is one hell of a... |
| © 2009 BrightSurf.com |