A5014650557- Weed Control and Herbicide Applications
- Agronomic Practices and Intercropping Systems
- Pesticide and Herbicide Environmental Studies
- Turfgrass Adaptation and Management
- Rangeland and Wildlife Management
- Allelopathy and phytotoxic interactions
- Legume Nitrogen Fixing Symbiosis
- Plant Disease Management Techniques
- Plant and fungal interactions
- Soil Carbon and Nitrogen Dynamics
- Wheat and Barley Genetics and Pathology
- Seedling growth and survival studies
- Diverse Educational Innovations Studies
- Seed Germination and Physiology
- Nematode management and characterization studies
- Rice Cultivation and Yield Improvement
- Crop Yield and Soil Fertility
- Botany, Ecology, and Taxonomy Studies
University of Wyoming
2007-2023
University of Nebraska–Lincoln
2010-2017
Oregon State University
2014
Garden City Community College
2012
NOAA National Weather Service
2012
Western Nebraska Community College
2011
Abstract Earlier reports have summarized crop yield losses throughout various North American regions if weeds were left uncontrolled. Offered here is a report from the current WSSA Weed Loss Committee on potential due to based data collected of United States and Canada. Dry bean loss estimates made by comparing dry in weedy control with plots that had >95% weed research studies conducted growing Canada over 10-year period (2007 2016). Results these field showed growers Idaho, Michigan,...
Timing of weed emergence and seed persistence in the soil influence ability to implement timely effective control practices. Emergence patterns kochia populations were monitored 2010 2011 at sites Kansas, Colorado, Wyoming, Nebraska, South Dakota. Weekly observations initiated March continued until no new occurred. Seed was harvested from each site, placed into 100-seed mesh packets, buried depths 0, 2.5, 10 cm fall 2011. Packets exhumed 6-mo intervals over 2 yr. Viability seeds evaluated....
Kochia control in continuous corn became increasingly difficult experimental plots where isoxaflutole was used PRE for 8 yr. Studies were conducted to determine if poor kochia resulted from an escape mechanism based on different germination rates or a difference sensitivity isoxaflutole. Germination at constant temperatures showed that the population plot had greater seed dormancy compared with populations growing adjacent fields. 25 C seeds collected isoxaflutole-treated area near 20% after...
Kochia is a troublesome weed in the western Great Plains and many accessions have evolved resistance to one or more herbicides. Dicamba-resistant soybean being developed provide an additional herbicide mechanism of action for POST control soybean. The objective this study was evaluate variation response dicamba among kochia collected from across Nebraska. plants were grown greenhouse treated when they 8 12 cm tall. A discriminating experiment with single dose 420 g ae ha −1 conducted on 67...
Abstract Vigorous stands of perennial grasses can effectively provide long-term control many invasive plants on rangelands. However, in degraded conditions, successful reestablishment be compromised by annual grasses, such as downy brome. Propoxycarbazone-sodium is a selective herbicide currently labeled for brome small grains, but its potential use rangelands unknown. Studies were conducted from 2004 through 2008 at three rangeland sites Colorado and Nebraska to evaluate grass injury with...
Glyphosate-resistant (GR) sugarbeet is commonly grown in rotation with GR corn, but there limited information relating to volunteer corn interference or control sugarbeet. Field studies were conducted near Lingle, WY and Scottsbluff, NE 2009 2010 quantify yield loss response density duration of interference, determine appropriate practices for use Hybrid resulted a similar competitive effect on sucrose as clumps F 2 corn. Clumps controlled 81% compared 73% individual plants. Linear...
Volunteer corn can affect dry bean by reducing yields; expanding the life cycle of insects, mites, and pathogens; interfering with harvest; contaminating seed. Field studies were conducted at Lingle, WY, Scottsbluff, NE, to determine relationship between volunteer density yield, establish proper time removal, whether yield was affected method used remove corn. reduced yields, as recorded in other crops. Growing conditions for each location different, indicated accumulated growing degree days...
Field trials were conducted from 2010 through 2012 to evaluate the integration of three factors: overhead irrigation after planting great northern dry bean; methods seedbed preparation: no-tillage, one or two diskings; and eight weed control treatments on bean development control. The previous crop each year was corn. Overhead with 13 mm water immediately herbicide application in early June did not improve reduce efficacy but where herbicides utilized, increased emergence. Soil crusting 2 3...
Abstract Understanding the effects of crop management practices on weed survival and seed production is imperative in improving long-term strategies, especially for herbicide-resistant populations. Kochia [ Bassia scoparia (L.) A.J. Scott] an economically important western North American cropping systems many reasons, including prolific evolved resistance to numerous herbicide sites action. Field studies were conducted 2014 a total four field Wyoming, Montana, Nebraska quantify impact...
Abstract Development of integrated weed management strategies requires knowledge emergence timing and patterns, which are regulated primarily by water thermal requirements for seed germination. Laboratory experiments were conducted in fall 2017 to 2018 quantify the effect osmotic potential temperature on germination 44 kochia [ Bassia scoparia (L.) A.J. Scott] populations under controlled conditions. collected 2016 from northern (near Huntley, MT, Powell, WY) southern Lingle, WY,...
Abstract Kochia is one of the most problematic weeds in United States. Field studies were conducted five states (Wyoming, Colorado, Kansas, Nebraska, and South Dakota) over 2 yr (2010 2011) to evaluate kochia control with selected herbicides registered common crop scenarios: winter wheat, fallow, corn, soybean, sugar beet provide insight for diversifying management rotations. varied by experimental site such that more variation biomass production was explained than herbicide choice within a...
Information linking seed movement, along with changes in viability, is critical for understanding weed dynamics. Studies were conducted to examine the use of passive integrated transponder (PIT) tags placed nylon mesh packets combination GPS (Global Positioning System) technology track movement after tillage. Cylindrical PIT 11.5, 12, 20, and 23 mm long by 2 wide evaluated water soil. Detection improved as tag size increased because greater signal strength. Tags main axis oriented vertically...
Field trials were conducted from 2006 through 2008 to determine the influence of ethofumesate applied at planting followed by dimethenamid-p or s -metolachlor emerged sugarbeet for late-season weed control in glyphosate-resistant sugarbeet. The entire plot area was kept weed-free until mid-June applying glyphosate four- and eight-true-leaf growth stages. Glyphosate not late-July allow as a measure residual benefit ethofumesate, dimethenamid-p, earlier growing season. Dimethenamid-p effective...
The use of aminopyralid combined with metsulfuron for western snowberry control was evaluated field trials conducted near Rushville, NE. Herbicides treatments consisted plus metsulfuron, 2,4-D, 2,4-D alone, and chlorsulfuron dicamba. All were applied in May June. Sixty days after treatment (DAT) at 0.073 + 0.012 kg ai ha −1 64%, whereas when June, 97%. Meanwhile 99 78% the June applications, respectively. No major differences between application timings observed 60 DAT rest treatments,...
Abstract Soil-applied herbicides are important for controlling weeds in many crops but risk damage to susceptible rotational if they persist. Field studies were conducted Powell, WY, from 2015 through 2017 evaluate the effect of reduced water availability on soil-applied herbicide dissipation. Eight herbicides, applied dry bean or corn, exposed three season-long irrigation treatments (100%, 85%, and 70% estimated crop evapotranspiration [ETc]) by overhead sprinkler. Soil samples collected a...
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Precipitation for 2011 totaled 12.12 in.This was 7.12 in.below the 30-year average of 19.24 in.Each month, with exception April and December, recorded belowaverage moisture.The year ranked 15th driest since our records began 103 years ago.The largest precipitation event 1.20 in. rain/snow on December 20.Pea-size hail noted May 25.Measureable snowfall occurred in January, February, March, 2011.Annual 17.2 in.The is 19.7 8.0 wet snow 20.Seasonal (2010-2011) 9.5 in.Average daily wind speed 4.65...
The impact of different weed control treatments on soil seed bank dynamics was studied at Torrington, WY, for a corn/sugarbeet and barley/sugarbeet crop rotation. Common lambsquarters, hairy nightshade, redroot pigweed accounted 90% the total in bank. Samples collected after corn or barley harvest showed no significant differences numbers due to herbicide treatments; however, were evident samples following sugarbeet harvest. Glyphosate applied postemergence 2 6 true-leaf stage conventional...