Weed zapping
Researchers found that electrocution treatments can eliminate up to 97% of late-season, herbicide-resistant waterhemp plants. The treatments also reduced weed seed viability by 54-80%, with some studies showing yield losses of 11-26%.
Weeds
Articles tagged with Weeds
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Rare plants attract rare bees and birds in urban gardens
A Dartmouth-led study found that urban gardens with rare plant species tend to attract rare bee and bird species. Women, older gardeners, and those living near the gardens are more likely to curate these rare plants, suggesting a cascading effect on biodiversity.
Timing is everything for weed management
Researchers identified peak emergence times for 15 problematic weed species in the Northeast, revealing that waiting till after June 1 can avoid common ragweed. Flexible crop rotations and weather-based predictions can help farmers plan ahead and control weeds more effectively.
Mugwort allergy: MedUni Vienna study creates basis for vaccine
A research team at MedUni Vienna has discovered key mechanisms of mugwort allergy, laying the foundation for a potential vaccine. The study found that fragments of the major mugwort pollen allergen can be used for effective therapy, providing a promising first step towards causal therapy and prevention.
Agricultural companies use new tools for herbicide discovery
Herbicide companies are shifting their research focus to address growing resistance, using AI, X-ray crystallography, and computer simulations to predict target enzymes and inhibit herbicides. This could lead to new commercial products, but experts caution farmers to moderate use and consider additional crop protection tools.
Review examines the impact of herbicide-resistant crops on weed management
A recent review of 25 years of data on herbicide-resistant crops found they can play a key role in integrated weed management, reducing herbicide use and weed population selection pressure. However, growers often rely solely on these crops, leading to widespread herbicide-resistant weed populations.
First mite to lead biological fight against Russian olive approved for use in Canada
The Canadian Food Inspection Agency has granted permission for Aceria angustifoliae, a shoot-and-flower-attacking eriophyid mite, to be released in Canada under the authority of the Canadian Plant Protection Act. The mite is expected to help control Russian olive's aggressive spread and was assessed as having a very narrow host range.
UF/IFAS scientists record first case of harmful bacteria in ubiquitous weed throughout US
Scientists at UF/IFAS have recorded the first North American case of 'Candidatus Phytoplasma brasiliense' in yellow nutsedge, a highly invasive and aggressive weed. This discovery poses significant threats to agriculture and ornamental industries in the US.
Climate change demands near perfect weed control in soybean
Research reveals that climate change and drought can cause significant yield losses in soybeans, even with high levels of weed control. To mitigate this, farmers need to adopt integrated weed management strategies, including the use of soil-residual herbicides and late-maturing soybean varieties.
Study points to possible improvements in the weed scouting technologies
A University research team explored the impact of environmental conditions on remote sensing results. They found that light reflections vary by weed species and density, allowing for more accurate differentiation between crops and weeds.
RIT scientists part of massive study on clover showing urbanization drives adaptive evolution
A massive study on white clover found that urbanization leads to adaptive evolution at a global scale. RIT scientists collected over 110,000 samples from 160 cities across six continents to test a chemical defense compound's effect on stress tolerance.
New research demonstrates high value ‘injurious weeds’ can bring to both pollinators and biodiversity
A new study finds that weed species classified as 'injurious weeds' support higher diversity and abundance of pollinators compared to recommended plants. The research suggests that these weeds produce more nectar sugar, making them a valuable resource for flower-visiting insects.
CSU, biotech company partnering on RNA-based method for weed control
Researchers at Colorado State University are developing an RNA-based method for controlling herbicide-resistant weeds using gene-silencing technology. The goal is to create a non-genetically modified, shelf-stable spray that targets specific strands of RNA in weed cells, leaving crops untouched.
Illinois research shows how dicamba could be safely used in sweet corn
A study by University of Illinois researchers found that applying dicamba at the latest growth stage and using a safener can help minimize injury to sweet corn. The results suggest that dicamba could be used safely in sweet corn with proper application timing and formulation, offering practical guidance for farmers.
Tiny mite shows promise as biological control agent to fight Australian swamp stonecrop in UK and Europe
A new study confirms a tiny mite, Aculus crassulae, shows promise as a biological control agent against the invasive aquatic weed Crassula helmsii in the UK and Europe. The research reveals that A. crassulae favours C. helmsii, reducing its vegetative growth and promoting leaf senescence.
Stemming the tide of invasive weeds with world-first herbicide capsules
Researchers have developed a novel herbicide delivery system using capsules that drill into invasive weeds, providing a safer and more effective alternative to traditional methods. The system has shown promising results in reducing herbicide usage by 30% while maintaining effectiveness against various weed species.
First dicamba-resistant waterhemp reported in Illinois
Researchers have confirmed a Champaign County waterhemp population is resistant to dicamba, with a 65% control rate. The population shows signs of metabolic resistance, activating detoxification genes before the chemical can harm. This finding raises concerns about the potential for broader herbicide resistance.
Surveys show horseweed is a persistent and unpredictable foe in soybean crops
Researchers found a marked increase in horseweed infestations over five years, with the weed appearing in every county surveyed annually. The study also identified significant clusters of horseweed movement, highlighting the need for proactive control measures to reduce yield losses.
Weed goes off script to resist herbicides
University of Illinois researchers discovered waterhemp's unique mechanism to detoxify the herbicide SA3, adding complexity to controlling this weed. This finding raises concerns about the potential for waterhemp to resist new herbicides before they are even commercialized.
Yeast and bacteria together biosynthesize plant hormones for weed control
Scientists have developed a method to produce strigolactones, a group of plant hormones that prevent excessive budding and branching. By combining yeast and bacteria, researchers can synthesize these hormones from microbes, providing a promising alternative to traditional methods.
Think climate change is bad for corn? Add weeds to the equation
Researchers found that late-season weeds had a significant impact on corn yields, with minimal control resulting in an average loss of 50% and exacerbating crop losses under hot or dry conditions. The study suggests that climate change is not the only factor affecting corn yield, but rather its interaction with weeds.
No-till production farmers can cut herbicide use, control weeds, protect profits
Researchers found that no-till production farmers can reduce herbicide use by implementing integrated weed-management practices, such as high-residue cultivation and seeding companion crops. Despite increased weed pressure, crop yields and profits were not significantly affected.
White clover’s toxic tricks traced to its hybridization
Research at Washington University in St. Louis reveals that white clover's chemical defense against insect pests comes from both of its parental species, not just one as previously thought. The plant's ecological success can be attributed to this cyanogenesis process.
Invasive plants are still for sale as garden ornamentals, research shows
A new study reveals that 1,330 nurseries and retailers sell hundreds of invasive plant species, including 20 illegal ones. Regional regulation and outreach are needed to reduce their spread.
Herbicide resistance no longer a black box for scientists
Researchers identify gene regions responsible for non-target-site herbicide resistance in waterhemp, a key step towards early detection and management tools. By analyzing the genome of waterhemp, scientists have narrowed down the genetic regions controlling resistance to two areas, paving the way for further studies.
Stinkweed could make a cleaner bio-jet fuel, study finds
A new study suggests that growing stinkweed as a crop could produce cleaner jet fuel with fewer environmental impacts than other biofuels. The study found that stinkweed requires less fertilizer and pesticides, resulting in lower carbon dioxide emissions and air pollution.
Common weed could spell bellyache for gluten intolerant
Researchers identified 19 gluten-like proteins in ryegrass, a common weed contaminating gluten-free crops. The study aims to develop tests to detect these proteins in food products.
Study shows environmental link to herbicide-resistant horseweed
A study by Michigan State University found that horseweed's growth type is influenced by environmental cues, with rosette plants emerging in response to temperature and photoperiod variations. Upright plants, resistant to glyphosate, are three- to four-fold less sensitive than their rosette siblings, making them harder to control.
Scientists call for improved management of a weedy tree to protect owl habitat
New research shows that dense sweet pittosporum canopies reduce bird richness and abundance, leading to declines in ground-dwelling birds. Restoration projects must balance weed control with retention of structural value to support local plants and animals.
Mixtures of two herbicides have less environmental impact when mixed in laboratories
A University of Córdoba study found that mixing two herbicides in laboratories results in a more effective and environmentally friendly method for controlling difficult-to-control weeds. The commercial mixture was shown to have a lower environmental impact than manual mixing, reducing risks and boosting effectiveness by 10-20%.
Research spotlights Minnesota's successes in eradicating Palmer amaranth
Researchers highlight Minnesota's success in eradicating Palmer amaranth, a hard-to-control noxious weed that can significantly reduce crop yields. The state's coordinated approach, including broad cooperation among stakeholders and swift action, led to the eradication of infestations at multiple sites across the state.
International effort to combat crop-threatening weeds headed by CSU scientists
A global consortium led by CSU scientists is sequencing complete genomes of 10 intractable weed species to advance humanity's approach to weeds and crops. The project aims to develop genomic tools for improved management and reduce the use of unsustainable practices like soil tillage.
Researchers validate new technique for rapidly diagnosing herbicide-resistant weeds
A new rapid 'leaf-disk assay' uses chlorophyll fluorescence emissions to determine herbicide resistance. The technique quickly identifies resistant populations, enabling growers to take proactive steps against spreading resistant weeds.
U of M researchers develop 99.9% accurate genetic test for early detection of Palmer Amaranth
A new genetic test has been developed by U of M researchers to identify Palmer Amaranth, which can cause significant yield loss in corn, soybean, and cotton crops. The test, which shows 99.9% accuracy, could be commercially available by the end of 2021.
Weed invaders are getting faster
A study by James Cook University found that invasive plants rapidly adapt to new regions, growing and reproducing faster in tropical environments. This trend suggests that global warming will increase invasive impacts in these areas.
Unveiling the cause of onion center rot
A new study has identified pantaphos as the molecule responsible for causing onion center rot. The researchers also discovered that pantaphos can act as an effective herbicide and is toxic to glioblastoma cells, making it a promising candidate for agricultural and biomedical applications.
Invasive weed may help treat some human diseases, researchers find
Researchers have discovered that extracts from the invasive weed Andropogon virginicus show promise in treating type 2 diabetes and blood cancer by inhibiting cell damage and killing cancer cells. The team plans to further test the compounds and develop functional pharmaceuticals.
Study points to the challenges of harvest-time weed seed controls in Pacific Northwest
Researchers found that environmental conditions and agronomic factors influence seed production and shattering patterns in four major weeds of the Pacific Northwest. Feral rye showed the greatest potential for harvest-time control due to slower shattering rates, while rattail fescue was a poor candidate.
UT Plant Sciences' Senseman receives highest honor from WSSA
Scott Senseman, UT Department Head, receives highest honor from WSSA for his work in weed science and education. He emphasizes the importance of developing the next generation of weed scientists to address global food security challenges.
Variable weather makes weeds harder to whack
A study found that variable weather conditions make pre-emergence herbicides less effective, leading to increased use of post-emergence herbicides. Herbicide combinations can help minimize rainfall requirements and improve weed control.
Survey shows dicamba may reduce the effectiveness of junglerice controls
Researchers found dicamba interferes with glyphosate and clethodim control, reducing effectiveness by 25% and 6.5% respectively. Junglerice was the most prevalent weed to escape treatment in dicamba-resistant fields.
Male weeds may hold key to their own demise
Researchers have identified key genes responsible for male sexual organs in two problematic agricultural weeds. Understanding these genes could lead to new ways to control the weeds' spread. Dioecy, a rare plant reproductive trait, allows the weeds to evade multiple herbicides and adapt to environments.
Scientific journal launches new series on the biology of invasive plants
The journal Invasive Plant Science and Management has launched a new series on the biology of invasive plants, focusing on emerging threats such as Pyrachantha augustifolia. The series aims to provide practical recommendations for intervening with invasive plant species and alerting biosecurity managers.
$2M grant supports more sustainable path for organic farmers
A Cornell University-led team is developing more sustainable organic farming practices that balance productivity, environmental impact, and growers' quality of life. The project uses cover crops like rye to suppress weeds and reduce soil degradation.
Cover crop could solve weed problems for edamame growers
A new study shows early-terminated rye can effectively suppress weeds in edamame without harming the crop, increasing yield and reducing contamination. However, other crops like lima bean may not benefit from this approach due to their nitrogen-fixing limitations.
Studies explore the role of cover crops in suppressing glyphosate-resistant horseweed
Researchers found that cereal rye cover crops can reduce horseweed density, but may not eliminate herbicide needs. Planting green with undisturbed cover crops increased biomass and soybean yields.
Three perspectives on cover crop integration: New "Focus on Cotton" Webcast
University of Tennessee Extension specialists share perspectives on integrating cover crops into cotton systems, highlighting benefits and drawbacks. Earlier termination of the cover crop and moving residue away from rows can improve stand establishment, according to research.
Research explores factors influencing soybean injury by synthetic auxin herbicides
Researchers found that four out of seven commercial formulations of dicamba and 2,4-D became highly acidic when mixed with glyphosate, increasing volatility. High temperatures and low wind speeds resulted in greater soybean injury, while dicamba produced more injury than 2,4-D.
When, how, and why to use harvest aids
Harvest aids accelerate natural processes to minimize trash, improve quality, and expedite harvesting. The timing of application is crucial, considering factors like labor availability, weather, and regional preferences.
Cover crops effective at suppressing weeds in cotton
Planting cover crops is a key strategy for effective integrated weed management in cotton, offering benefits like improved Palmer amaranth control and reduced herbicide input. Research shows that cover crops can also mitigate wind and water erosion, while minimizing labor and improving cotton stand.
Genomes published for major agricultural weeds
Researchers have published the most comprehensive genome information for three troublesome agricultural weeds, which could lead to better understanding of herbicide resistance. The genomes will help identify specific enzymes responsible for detoxifying herbicides, enabling scientists to develop new control methods.
Study calls for urgent plan to manage invasive weed which threatens livelihoods in Africa
Researchers call for integrated management strategy to combat Mimosa diplotricha's impact on crop yields, biodiversity, and local livelihoods. The invasive weed is threatening the region's agricultural productivity and socio-ecological balance.
A simple screening process may enhance monoclonal antibody-based drug development
Researchers have discovered that a single molecular descriptor can predict the solution behavior of therapeutic antibodies with greater than 90% accuracy. This finding could enable faster and more efficient drug development for monoclonal antibody-based therapies.
Iowa State University scientists examine reproductive effects of glyphosate in mice
Researchers analyzed how ovarian function in mice responded to various levels of glyphosate exposure and found increased ovarian weight and follicle number at highest exposure levels. However, the study did not uncover evidence that glyphosate affects the healthy functioning of ovaries.
Weed's wily ways explained in Illinois research
Researchers have discovered that herbicide-resistant weeds like waterhemp produce detoxifying enzymes to neutralize certain chemicals, making them resistant to common herbicides. This metabolic resistance strategy is hard to identify and combat, highlighting the need for a multi-pronged approach to control these weeds.
Study documents the challenges of herbicide-resistant annual bluegrass in turf
Researchers have identified 31 populations of herbicide-resistant annual bluegrass in Australia, highlighting the narrowing options for effective control. The weed has developed resistance to multiple herbicides, including propyzamide and rimsulfuron, with levels of resistance ranging from two-fold to 56-fold.
Global warming will lift agriculture weed threat
Climate change may lead to a decrease in areas suitable for most Invasive Weed Species globally, but not in highly productive agricultural regions like Europe, US and Australia. Existing eradication efforts are inadequate to counter the growing threat of invasive weeds.
Satellite technology to help tackle invasive aquatic weeds
A new study led by the University of Stirling will use satellite technology to monitor invasive aquatic weeds in neglected water bodies in India. The project aims to detect regrowth early and prevent damage to fisheries, drinking water sources, and agricultural irrigation.
Crops sown in a uniform spatial pattern produce higher yields and reduce environmental impact
Researchers found that a uniform grid-like pattern of crop sowing leads to higher yields (76% of trials) and fewer weeds (73% of trials). This approach can reduce herbicide use and fertiliser runoff, resulting in more sustainable agriculture.
New research explores the impact of cover crop residues on weed control
Researchers found that cover-crop biomass and carbon to nitrogen ratios significantly influenced weed suppression, with certain mixtures producing more effective control. Cover crops also promoted greater crop yields when used as a sole weed control measure.