A5040441377- Weed Control and Herbicide Applications
- Agronomic Practices and Intercropping Systems
- Pesticide and Herbicide Environmental Studies
- Allelopathy and phytotoxic interactions
- Legume Nitrogen Fixing Symbiosis
- Plant tissue culture and regeneration
- Bioenergy crop production and management
- Crop Yield and Soil Fertility
- Soil Carbon and Nitrogen Dynamics
- Soybean genetics and cultivation
- Nematode management and characterization studies
- Remote Sensing in Agriculture
- Spectroscopy and Chemometric Analyses
- Plant and animal studies
- Turfgrass Adaptation and Management
- Research in Cotton Cultivation
- Peanut Plant Research Studies
- Biological Control of Invasive Species
- Agriculture, Plant Science, Crop Management
- Seed and Plant Biochemistry
- Plant and fungal interactions
- Potato Plant Research
- Plant Disease Management Techniques
- Cassava research and cyanide
- Insect-Plant Interactions and Control
North Carolina State University
2016-2025
North Central State College
2021
Research Triangle Park Foundation
2021
Southern Research Institute
2021
Southern Research Station
2021
Virginia Tech
2021
Plymouth State University
2021
Michigan State University
2011-2013
Science North
2012
Washington State University
2007-2008
Crop losses from weed interference have a significant effect on net returns for producers. Herein, potential corn yield loss because of across the primary corn-producing regions United States and Canada are documented. Yield-loss estimates were determined comparative, quantitative observations yields between nontreated treatments providing greater than 95% control in studies conducted 2007 to 2013. Researchers each state province provided data replicated, small-plot at least 3 up 10...
Weeds are one of the most significant, and controllable, threats to crop production in North America. Monetary losses because reduced soybean yield decreased quality weed interference, as well costs controlling weeds, have a significant economic impact on net returns producers. Previous Weed Science Society America (WSSA) Loss Committee reports, chaired by Chandler (1984) Bridges (1992), provided snapshots comparative weeds across geographic regions crops within these after implementation...
Field studies were conducted in North Carolina to determine the critical period of weed control (CPWC) for Italian ryegrass winter wheat. Soft red wheat was planted late fall 2017 and 2018 no-till fields near Salisbury, NC. Treatments consisted allowing weeds grow from crop emergence different intervals until removal (“weedy”), maintaining “weed-free” conditions same intervals, then letting emerge compete with duration season. In 2017, occurred two-week up 18 weeks after (WAE) three-week WAE...
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...
Cotton growers rely heavily upon glufosinate and various residual herbicides applied preplant, PRE, POST to control Palmer amaranth resistant glyphosate acetolactate synthase-inhibiting herbicides. Recently deregulated in the United States, cotton dicamba, glufosinate, (B2XF cotton) offers a new platform for controlling herbicide-resistant amaranth. A field experiment was conducted North Carolina Georgia determine B2XF tolerance compare by dicamba currently used, nondicamba program both...
Dramatic growth in herbicide-resistant (HR) weeds the United States threatens farm profitability and may undercut environmentally beneficial farming practices. When HR move across boundaries due to ecological processes or human action, a common pool resource challenge emerges, requiring farmer cooperation manage such effectively. We investigate scope for cooperative management using responses national survey on weed issues test recursive model of three preconditions collective action: (1)...
Abstract Yield losses due to weeds are a major threat wheat production and economic well-being of farmers in the United States Canada. The objective this Weed Science Society America (WSSA) Loss Committee report is provide estimates yield weeds. scientists provided both weedy (best management practices but no weed control practices) weed-free providing >90% control) average from replicated research trials winter spring 2007 2017. Winter loss ranged 2.9% 34.4%, with weighted (by...
Abstract Atrazine carryover from application to a monocot crop may adversely affect soybean ( Glycine max (L.) Merr.) grown in rotation. Here, we tested the hypothesis that genotype selection could reduce atrazine damage soybean. Five commercially relevant varieties were evaluated for differences sensitivity range of rates using visual ratings, photosynthetic, and biomass parameters. Visual injury ratings photosynthetic gas exchange, chlorophyll fluorescence, relative content (SPAD),...
Abstract North Carolina growers have long struggled to control Italian ryegrass, and recent research has confirmed ryegrass biotypes resistant nicosulfuron, glyphosate, clethodim, paraquat. Integrating alternative management strategies is crucial effectively such biotypes. The objectives of this study were evaluate with cover crops fall-applied residual herbicides investigate crop injury from herbicides. This was conducted during the fall/winter 2021-22 in Salisbury 2022-23 at Clayton, NC....
Field studies were conducted near Lewiston–Woodville and Rocky Mount, NC to evaluate the effects of mixed weed species on peanut yield. A combination broadleaf grass weeds allowed interfere with for various intervals determine both critical timing removal weed-free period. These periods then combined period control in peanut. The weedy yield also investigated. predicted control, presence a population weeds, was found be from 3 8 wk after planting (WAP). Peanut decreased as interference...
Field studies were conducted near Clayton, Lewiston, and Rocky Mount, NC in 2005 to evaluate weed control cotton response preemergence treatments of pendimethalin alone or a tank mixture with fomesafen, postemergence glufosinate applied S -metolachlor, POST-directed flumioxazin prometryn. Excellent (> 91%) was observed where at least two applications made addition early (EPOST). A reduction common lambsquarters (8%), goosegrass (20%), large crabgrass (18%), Palmer amaranth (13%), pitted...
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 Harvest weed seed control (HWSC) comprises a set of tools and tactics that prevents the addition to soil bank, attenuating infestations providing method combat development spread herbicide‐resistant populations. Initial HWSC research efforts in North America are summarized and, combined with vast area crops suitable for HWSC, clearly indicate strong potential this technology. However, limitations exist not present Australian cropping systems where was developed. These include...
Field studies were conducted near Clayton, Goldsboro, Kinston, and Rocky Mount, NC in 2003 to evaluate weed control cotton response postemergence (POST) treatments of glufosinate applied alone or tank mixtures with s-metolachlor, pyrithiobac, trifloxysulfuron. Late-season common lambsquarters, ragweed, entireleaf morningglory, ivyleaf jimsonweed, pitted purple nutsedge, sicklepod early (EPOST) was ≥90%. The addition S-metolachlor EPOST improved all weeds except sicklepod, morningglory. When...
Residual herbicides are routinely recommended to aid in control of glyphosate-resistant (GR) Palmer amaranth cotton. Acetochlor, a chloroacetamide herbicide, applied PRE, controls amaranth. A microencapsulated (ME) formulation acetochlor is now registered for PRE application Field research was conducted North Carolina evaluate cotton tolerance and by ME alone various combinations. Treatments, consisted ME, pendimethalin, or no herbicide arranged factorially with diuron, fluometuron,...
Glyphosate resistance in Palmer amaranth was first confirmed North Carolina 2005. A survey that year indicated 17 and 18% of 290 populations sampled were resistant to glyphosate thifensulfuron, respectively. During the fall 2010, 274 predetermined sites surveyed determine distribution if where fomesafen, glufosinate, glyphosate, thifensulfuron occurred. present at 134 sites. When mortality for each biotype compared a known susceptible herbicide within rate, 93 36% biotypes controlled less by...
Palmer amaranth (Amaranthus palmeri S. Wats.) is a highly competitive weed that can be difficult to manage in many cropping systems. Research date has not quantified the growth and development of A. manner allows direct comparisons across was conducted compare growth, development, seed production when competing with corn (Zea mays L.), cotton (Gossypium hirsutum peanut (Arachis hypogaea soybean [Glycine max (L.) Merr.] emerging crops or three weeks after emerge. Regardless emerged, greatest...
Research was conducted from 2011 to 2014 determine weed population dynamics and frequency of glyphosate-resistant (GR) Palmer amaranth with herbicide programs consisting glyphosate, dicamba, residual herbicides in dicamba-tolerant cotton. Five treatments were maintained the same plots over duration experiment: three sequential POST applications glyphosate or without pendimethalin plus diuron PRE; dicamba PRE herbicides; a application acetochlor followed by one two herbicides. Additional...
Abstract Field studies were conducted in 2016 and 2017 Clinton, NC, to determine the interspecific intraspecific interference of Palmer amaranth ( Amaranthus palmeri S. Watson) or large crabgrass [ Digitaria sanguinalis (L.) Scop.] ‘Covington’ sweetpotato Ipomoea batatas Lam.]. D. established 1 d after transplanting maintained season-long at 0, 1, 2, 4, 8 16 plants m −1 row presence absence sweetpotato, respectively. Predicted yield loss for was 35% 76% 50% 79% A. row. Weed dry biomass per...
Abstract Complaints of control failures with acetolactate synthase (ALS)- and protoporphyrinogen oxidase (PPO)-inhibiting herbicides on redroot pigweed ( Amaranthus retroflexus L.) were reported in conventional soybean [ Glycine max (L.) Merr.] fields North Carolina. Greenhouse dose–response assays confirmed that the Camden County Pasquotank populations less sensitive to ALS- PPO-inhibiting compared susceptible A. populations, suggesting evolution resistance these herbicides. Sanger...
Abstract Field experiments were conducted at Clayton and Rocky Mount, North Carolina, during the summer of 2020 to determine growth fecundity Palmer amaranth plants that survived glufosinate with without grass competition in soybean crops. Glufosinate (590 g ai ha −1 ) was applied early postemergence (when 5 cm tall), mid-postemergence (7–10 cm), late (>10 cm) orthogonal combinations those timings. Nontreated grown weedy (i.e., intraspecific competition), weed-free in-crop (WFIC), fallow...
Greenhouse studies were conducted to evaluate 14 C-glufosinate absorption, translocation, and metabolism in glufosinate-resistant corn, goosegrass, large crabgrass, sicklepod. Glufosinate-resistant corn plants treated at the four-leaf stage, whereas sicklepod 5, 7.5, 10 cm, respectively. All harvested 1, 6, 24, 48, 72 h after treatment (HAT). Absorption was less than 20% all harvest intervals for absorption goosegrass crabgrass increased from approximately 1 HAT 50 76%, respectively, HAT. of...
Experiments were conducted at the Upper Coastal Plain Research Station near Rocky Mount and Peanut Belt Lewiston-Woodville in 2002 2003. injury was minimal (< 5%) with all soil-applied programs. S-Metolachlor PRE alone or mixture sulfentrazone, diclosulam, flumioxazin controlled annual grasses similarly (66 to 87%). The addition of imazapic plus 2,4-DB POST increased grass control (> 93%). Sulfentrazone diclosulam S-metolachlor best options, 94% 92% yellow purple nutsedge, respectively,...
Greenhouse studies were conducted to evaluate absorption, translocation, and metabolism of 14 C-glufosinate in glufosinate-resistant cotton, nontransgenic Palmer amaranth, pitted morningglory. Cotton plants treated at the four-leaf stage, whereas amaranth morningglory 7.5 10 cm, respectively. All harvested 1, 6, 24, 48, 72 h after treatment (HAT). Absorption was greater than 85% 24 amaranth. less 30% all harvest intervals for At HAT, 49 12% radioactivity translocated regions above below...
Weed residues can impact nitrogen (N) cycling in agro-ecosystems that primarily utilize POST weed control. Quantifying this potential N source or sink may influence control and fertilization practices. A laboratory experiment measured the rate quantity of release from common lambsquarters, ragweed, giant foxtail. Weeds were grown field at four rates (0, 67, 134, 202 kg ha −1 ) collected two heights (10 20 cm) to give a range residue chemical composition. Residue composition parameters carbon...