A5022133770- Weed Control and Herbicide Applications
- Agronomic Practices and Intercropping Systems
- Pesticide and Herbicide Environmental Studies
- Legume Nitrogen Fixing Symbiosis
- Soybean genetics and cultivation
- Allelopathy and phytotoxic interactions
- Nematode management and characterization studies
- Biological Control of Invasive Species
- Crop Yield and Soil Fertility
- Remote Sensing in Agriculture
- Leaf Properties and Growth Measurement
- Sunflower and Safflower Cultivation
- Seed Germination and Physiology
- Plant Parasitism and Resistance
- Plant Water Relations and Carbon Dynamics
The Ohio State University
2024-2025
Ames National Laboratory
2024
University of Wyoming
2024
Iowa State University
2020-2023
Montana State University
2017-2018
Abstract Field experiments were conducted in soybeans ( Glycine max L.) to determine the effects of a cereal rye Secale cereale cover crop (CC), two CC termination timings (TTs), and four herbicide programs (HP) on emergence, biomass, seed production waterhemp Amaranthus tuberculatus [Moq.] J.D. Sauer) horseweed Erigeron canadensis L.). The early occurred seven days (d) before soybean planting, late 12 after planting. presence CC, regardless TT, reduced emergence by 39% 44% compared no at 5...
Abstract The herbicides that inhibit 4-hydroxyphenylpyruvate dioxygenase (HPPD) are primarily used for weed control in corn, barley, oat, rice, sorghum, sugarcane, and wheat production fields the United States. objectives of this review were to summarize 1) history HPPD-inhibitor their use States; 2) resistant weeds, mechanism resistance, management; 3) interaction with other herbicides; 4) future HPPD-inhibitor-resistant crops. As 2022, three broadleaf weeds (Palmer amaranth, waterhemp,...
Abstract Field experiments were conducted over 2 yr (2019 to 2020) at two locations in Iowa evaluate multi-tactic strategies for managing multiple herbicide–resistant (MHR) waterhemp [ Amaranthus tuberculatus (Moq.) Sauer] a corn ( Zea mays L.)–soybean Glycine max (L.) Merr.] rotation. The effect of three herbicide programs on A. control was tested (2019). effects the prior year’s weed control, cereal rye Secale cereale L.) cover crop, and soybean row spacing (38-cm vs. 76-cm wide) density,...
A landscape-scale probability-based sampling of Iowa soybean [Glycine max (L.) Merr.] fields was conducted in 2013 and 2019; Amaranthus tuberculatus [Moq.] J.D. Sauer seed collected from 97 random geospatial selected fields. The objectives were to evaluate the prevalence distribution herbicide-resistant A. (waterhemp) temporal changes over 6 years. seedlings evaluated for resistance imazethapyr, atrazine, glyphosate, lactofen mesotrione at 1× 4× label rates.Resistance rate increased...
Abstract Palmer amaranth ( Amaranthus palmeri S. Watson) was first reported in Iowa 2013 and has continued to spread across the state over last decade. is widely recognized as one of more economically important weeds production agriculture. The presence A. concerning species evolved resistance ten herbicide sites action, however, no formal characterization been conducted on populations. Therefore, assays were an population collected Harrison County, IA, 2023 (Southwest Amaranth [SWPA]) a...
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 Waterhemp ( Amaranthus tuberculatus [Moq.] Sauer) escapes are common in midwestern U.S. soybean [ Glycine max (L.) Merr.] fields due to the continued rise herbicide-resistant (HR) populations. In a conventional harvesting system, weed seeds harvested with crop grain and spread back on field. Harvest seed control methods such as chaff lining concentrate seed-bearing into narrow row (chaff line). These lines (30- 50-cm wide) undisturbed following growing seasons, under assumption that...
Multiple herbicide-resistant waterhemp ( Amaranthus tuberculatus (Moq.) J.D. Sauer) has limited herbicide options for Iowa row crop production. Soybean Glycine max (L.) Merr.) cultivars and corn Zea mays L.) hybrids resistant to 2,4-D, dicamba, glufosinate have provided more management. A probability-based survey of fields was conducted in fall 2019 wherein seeds were collected their susceptibility determined. The average survival all populations treated with 1× 17%, 5%, 4%, respectively....
Abstract Evolution of kochia resistance to glyphosate and dicamba is a concern for growers in the US Great Plains. An increasing use with widespread adoption glyphosate/dicamba-resistant (GDR) soybean recent years may warrant greater attention. Long-term stewardship this new stacked-trait technology will require implementation diverse weed control strategies, such as soil-residual herbicides (PRE) aimed at effective GDR kochia. Field experiments were conducted Huntley, MT, 2017 2018, Hays,...
Weed management in safflower (Carthamus tinctorious L.) is a major challenge for growers due to very limited herbicide options available, particularly broadleaf weed control. Field experiments were conducted at the Montana State University Southern Agricultural Research Center (MSU-SARC) near Huntley, MT 2015 and 2016 evaluate preemergence (PRE) soil-residual herbicides crop safety season-long control safflower. Among all programs tested, only sulfentrazone (105 g·ai·ha-1) alone or with...
Abstract Simple crop rotations like maize and soyabean grown in succession often coincide with simple weed management tactics, resulting infestations that are highly adapted to the conditions maintained for selected crops. Amaranthus tuberculatus is a prominent species which possesses biological characteristics allow it persist maize–soyabean rotations. Spring wheat oats emerge earlier than A. narrower rows soyabean, may increase their competitive capability. A field study measured...
Abstract Mounting cases of herbicide-resistant waterhemp [ Amaranthus tuberculatus (Moq.) Sauer] in the U.S. Midwest have renewed interest nonchemical weed management strategies. Field experiments were conducted 2021 and 2022 to quantify effectiveness a commercial combine equipped with seed impact mill preventing A. return soil seedbank soybean Glycine max (L.) Merr.]. shattering before crop harvest was quantified. started seeds during last week August both years. Overall, 51% retained on...
Abstract Herbicide‐resistant waterhemp ( Amaranthus tuberculatus [Moq.] J.D. Sauer) continues to threaten the productivity of many US crops. Thus, integrating non‐herbicidal tactics with herbicides reduce weed seedbanks is gaining popularity. A field study was conducted near Logan, IA from fall 2021 2022 evaluate impacts cereal rye Secale cereale L.) cover crop, herbicides, and harvest seed destruction on seedbank inputs. The crop reduced production by 90% compared treatments without while...