A5036755683- Weed Control and Herbicide Applications
- Legume Nitrogen Fixing Symbiosis
- Soybean genetics and cultivation
- Pesticide and Herbicide Environmental Studies
- Plant and fungal interactions
- Agronomic Practices and Intercropping Systems
- Turfgrass Adaptation and Management
- Nematode management and characterization studies
- Ruminant Nutrition and Digestive Physiology
- Plant tissue culture and regeneration
- Plant and animal studies
- Rangeland and Wildlife Management
- Berry genetics and cultivation research
- Biological Control of Invasive Species
- Plant Pathogens and Resistance
- Crop Yield and Soil Fertility
- Soil Carbon and Nitrogen Dynamics
- Allelopathy and phytotoxic interactions
- Remote Sensing in Agriculture
- Botany, Ecology, and Taxonomy Studies
- Horticultural and Viticultural Research
- Insect and Pesticide Research
- Agricultural pest management studies
- Soil Management and Crop Yield
- Flowering Plant Growth and Cultivation
University of Missouri
2016-2025
Directorate of Weed Research
2017-2018
Westminster College - Pennsylvania
2017-2018
The University of Western Australia
2017
Plant (United States)
2006-2014
Waters (United States)
2013-2014
Howard Hughes Medical Institute
2011-2014
Purdue University West Lafayette
2005
Virginia Tech
2001-2004
Herbicides are the foundation of weed control in commercial crop-production systems. However, herbicide-resistant (HR) populations evolving rapidly as a natural response to selection pressure imposed by modern agricultural management activities. Mitigating evolution herbicide resistance depends on reducing through diversification techniques, minimizing spread genes and genotypes via pollen or propagule dispersal, eliminating additions seed soil seedbank. Effective deployment such...
ABSTRACT Engaging large numbers of undergraduates in authentic scientific discovery is desirable but difficult to achieve. We have developed a general model which faculty and teaching assistants from diverse academic institutions are trained teach research course for first-year undergraduate students focused on bacteriophage genomics. The situated within broader context aimed at understanding viral diversity, such that collaborators with established researchers the field. Howard Hughes...
Mycobacteriophages are viruses that infect mycobacterial hosts such as Mycobacterium smegmatis and tuberculosis. All mycobacteriophages characterized to date dsDNA tailed phages, have either siphoviral or myoviral morphotypes. However, their genetic diversity is considerable, although sixty-two genomes been sequenced comparatively analyzed, these likely represent only a small portion of the mycobacteriophage population at large. Here we report isolation, sequencing comparative genomic...
Field and greenhouse experiments were conducted to determine the level of glyphosate resistance in common waterhemp populations from Platte County (MO1) Holt County, Missouri (MO2), distribution glyphosate, acetolactate synthase (ALS)–inhibiting herbicides, protoporophyrinogen oxidase (PPO)–inhibiting herbicides across MO1 site. Results revealed that MO2 19 9 times more resistant respectively, than a susceptible population. In field experiments, greater 54% at site survived 1.7 kg ae ha −1...
Synthetic auxin herbicides have long been utilized for the selective control of broadleaf weeds in a variety crop and noncrop environments. Recently, two agrochemical companies begun to develop soybean with resistance 2,4-D dicamba which might lead an increase application these production areas near future. Additionally, little research has published pertaining effects newly-discovered synthetic herbicide, aminocyclopyrachlor, on phytotoxicity. Two field trials were conducted 2011 2012...
Two of the most problematic Amaranthus species in soybean production today are tall waterhemp and Palmer amaranth. This study determined percentage amaranth seed that was retained by weed at maturity to assess likelihood using at-harvest control tactics for soil seedbank management. plants were collected from fields Arkansas, Tennessee, Illinois, Missouri, Nebraska, Wisconsin, Illinois. Collected assessed retention 2013 2014. Within 1 wk maturity, harvested loose debris beneath swept into a...
Challenges to control broadleaf weeds in crops prompted development of soybean [ Glycine max (L.) Merr.] and cotton ( Gossypium hirsutum L.) with dicamba resistance. As a result an unprecedented number dicamba‐related injury cases the United States, movement was studied applied research setting. High‐volume air samplers were used determine concentrations after treatment soybean. In first set experiments, new commercial formulations Applications made at same time treated areas least 480 m...
Abstract Protoporphyrinogen oxidase (PPO)-inhibiting herbicides remain an important and useful chemistry 60 yr after their first introduction. In this review, based on topics introduced at the Weed Science Society of America 2021 symposium titled “A History, Overview, Plan Action PPO Inhibiting Herbicides,” we discuss current state PPO-inhibiting herbicides. Renewed interest in recent years, due to increased use cases resistance, has led refinements knowledge regarding mechanism action...
Abstract Winter cover crop performance metrics (i.e., vegetative biomass quantity and quality) affect ecosystem services provisions, but they vary widely due to differences in agronomic practices, soil properties, climate. Cereal rye (S ecale cereale ) is the most common winter United States its hardiness, low seed cost, high production. We compiled data on cereal metrics, properties across eastern half of States. The dataset includes a total 5,695 observations 208 site-years between...
A survey of soybean fields containing waterhemp was conducted just prior to harvest in 2012 determine the scope and extent herbicide resistance multiple resistances among a sample Missouri populations. Resistance confirmed glyphosate acetolactate synthase (ALS), protoporphyrinogen oxidase (PPO), photosystem II (PSII), 4-hydroxyphenylpyruvate dioxygenase (HPPD) inhibitors, but not 2,4-D. Of 187 populations tested, 186 exhibited chlorimuron. The proportions with atrazine or were similar, 30...
Migratory waterfowl have often been implicated in the movement of troublesome agronomic and wetland weed species. However, minimal research has conducted to investigate dispersal agronomically important species by waterfowl. The two objectives for this project were determine what are being consumed ducks snow geese, recovery rate viability 13 after passage through a duck's digestive system.Seed recovered from tracts 526 geese harvested during 2-year field study had 35 020 plants emerge. A...
Herbicide-resistant Amaranthus spp. continue to cause management difficulties in soybean. New soybean technologies under development, including resistance various combinations of glyphosate, glufosinate, dicamba, 2,4-D, isoxaflutole, and mesotrione, will make possible the use additional herbicide sites action than is currently available. When this research was conducted, these traits were still regulated testing programs with appropriate genetics a single experiment not feasible. Therefore,...
Abstract Foliar-applied postemergence applications of glufosinate are often applied to glufosinate-resistant crops provide nonselective weed control without significant crop injury. Rainfall, air temperature, solar radiation, and relative humidity near the time application have been reported affect efficacy. However, previous research may not captured full range weather variability which be exposed prior or following application. Additionally, climate models suggest more extreme will become...
Field experiments were conducted in 11 states to evaluate broadleaf weed management programs dicamba-resistant soybeans which involved the use of preemergence and postemergence dicamba. Preemergence (PRE) dicamba at 0.25 lb ae/acre provided less than 60% control smooth pigweed, giant ragweed, velvetleaf, palmer amaranth, waterhemp, morningglory spp., but 97% common lambsquarters horseweed 3 weeks after treatment (WAT). flumioxazin plus chlorimuron or sulfentrazone cloransulam 66 100% these...
A field experiment was conducted in Boone and Callaway counties Missouri 2010 2011 to investigate herbicide programs for the management of summer annual grass broadleaf weeds soybean resistant 2,4-D glufosinate. Results revealed that addition 0.56, 0.84, or 1.12 kg ha −1 (amine) either both POST applications glufosinate a two-pass program increased control common waterhemp compared two alone. Similar levels cocklebur, giant foxtail, large crabgrass, barnyardgrass were achieved with any...
Waterhemp is an increasingly problematic weed in the U.S. Midwest, having now evolved resistances to herbicides from six different site-of-action groups. Glyphosate-resistant waterhemp Midwest especially concerning given economic importance of glyphosate corn and soybean production. Amplification target-site gene, 5-enolpyruvylshikimate-3-phosphate synthase (EPSPS) was found be mechanism resistance Palmer amaranth, a species closely related waterhemp. Here, relationship between EPSPS gene...
The introduction of transgenic crops with resistance to 2,4-D will provide growers new weed management options in soybean. Field and greenhouse experiments were conducted 2010 2011 determine the influence height on compatibility glufosinate resistant Results from these indicate a significant increase rate or is needed when applied alone order achieve similar levels control as lower rates combinations. Mixtures more effective controlling common waterhemp, Asiatic dayflower, barnyardgrass than...
The recent interest in cover crops as component of Midwest corn and soybean production systems has led to the need for additional research, including effects residual herbicide treatments on fall crop establishment. Field studies were conducted 2013, 2014, 2015 Columbia, Missouri investigate common herbicides applied establishment winter wheat, tillage radish, cereal rye, crimson clover, oat, Austrian pea, Italian ryegrass, hairy vetch. Cover evaluated stand biomass reduction 28 d after...
The introduction of soybean and cotton traits with resistance to synthetic auxin herbicides has led an increase in concern over the off-target movement dicamba 2,4-D. A direct-mail survey was sent Missouri pesticide applicators January 2016 understand current herbicide application practices applicator knowledge awareness new technologies. Completed surveys were returned by 2,335 applicators, representing approximately 11% state’s registered applicators. Survey data reported herein provides...
Field experiments were conducted in Platte County, Missouri, during 2006 and 2007 to evaluate PRE, POST, PRE followed by (fb) POST herbicide programs for the control of glyphosate-resistant waterhemp soybean. All fb treatments resulted at least 66 70% 2007, respectively. Control was less than 23% with lactofen acifluorfen 2006, but 64% 2007. Variability likely from differences trial locations a population protoporphyrinogen oxidase (PPO)–resistant County site compared In both years,...
Resistance in waterhemp to herbicides that inhibit protoporphyrinogen oxidase (PPO) previously was shown result from the deletion of a glycine codon at position 210 (ΔG210) PPO-encoding gene, PPX2 . Research conducted determine if this same mechanism accounted for resistance geographically separated populations—from Illinois, Kansas, and Missouri—and, so, mutation conferring independently selected. A dose–response study with lactofen indicated resistant populations had different levels...
Abstract Potential effectiveness of harvest weed seed control (HWSC) systems depends upon shatter the target species at crop maturity, enabling its collection and processing harvest. However, retention likely is influenced by agroecological environmental factors. In 2016 2017, we assessed seed-shatter phenology in 13 economically important broadleaf soybean [ Glycine max (L.) Merr.] from physiological maturity to 4 wk after multiple sites spread across 14 states southern, northern,...
Abstract The herbicide dicamba has injured millions of hectares sensitive plant species in the United States since 2017. This injury coincided with commercialization dicamba-resistant soybean [ Glycine max (L.) Merr.] and cotton ( Gossypium hirsutum L.). We quantified atmospheric deposition mass flux 12 production regions Missouri. Dicamba was routinely detected weekly samples collected during agriculturally intensive spray periods. Observed concentrations were indicative both local (<1...
A total of four field experiments were conducted over a 2-yr period (2011 and 2012) near Mokane Moberly, Missouri, to determine the control glyphosate-resistant (GR) waterhemp with dicamba glyphosate applied alone or as tank-mix combination. In one experiment, was at 0.14, 0.28, 0.42, 0.56 kg ae ha −1 without 0.86 GR plants 7.5, 15, 30 cm in height. second sequential treatments plus 4, 7, 14 d after initial herbicide treatment measuring either 7.5 23 Control ranged from 7 62%, 11 40%, 8 30%...