Article
Agronomy
Emily Duenk, Nader Soltani, Robert T. Miller, David C. Hooker, Darren E. Robinson, Peter H. Sikkema
Summary: Field experiments conducted between 2021 and 2022 showed that a two-pass herbicide program of preplant (PP) followed by postemergence (POST) application provided the best control of glyphosate-resistant (GR) horseweed. The combination of 2,4-D choline/glyphosate DMA applied preplant with halauxifen-methyl or saflufenacil improved GR horseweed control. Glufosinate and 2,4-D choline/glyphosate DMA applied postemergence controlled GR horseweed by 71% and 86%, respectively.
Article
Agriculture, Multidisciplinary
Marcelo R. A. De Figueiredo, Hamlin Barnes, Claudia M. Boot, Ana Beatriz T. B. De Figueiredo, Scott J. Nissen, Franck E. Dayan, Todd A. Gaines
Summary: Amaranthus tuberculatus, a waterhemp plant species resistant to 2,4-dichlorophenoxyacetic acid (2,4-D), has been found to possess rapid metabolic detoxification ability. Through a novel detoxification mechanism, resistant plants hydroxylate 2,4-D into a less toxic metabolite, while susceptible plants conjugate 2,4-D to aspartate. This evolution of detoxification reactions in resistant plants allows for more efficient detoxification of 2,4-D.
JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY
(2022)
Article
Agronomy
Chandrima Shyam, Parminder S. Chahal, Amit J. Jhala, Mithila Jugulam
Summary: Glyphosate-resistant Palmer amaranth is a troublesome weed in soybean fields in Nebraska and many other states in the U.S. Soybean resistant to 2,4-D, glyphosate, and glufosinate has been developed to combat this issue. Different herbicide programs applied at various stages of growth showed effective control of GR Palmer amaranth and resulted in increased soybean yields without causing injury.
Article
Agriculture, Multidisciplinary
Austin Eide, Yu Zhang, Cengiz Koparan, John Stenger, Michael Ostlie, Kirk Howatt, Sreekala Bajwa, Xin Sun
Summary: Studies in mid-western states have shown that herbicide-resistant weed management has increased weed control costs by $20-$40 per acre. Greenhouse research found that glyphosate-resistant horseweed was reliably classified as the only resistant biotype, with 89% accuracy. More reliable identification of glyphosate-resistant weed species may require evaluation of additional multispectral sensing technologies or analysis models.
COMPUTERS AND ELECTRONICS IN AGRICULTURE
(2021)
Article
Agronomy
Adam Striegel, Amit J. Jhala
Summary: This study evaluated the performance of pre-emergence herbicides and herbicide-resistant soybean programs in the control of weeds, reduction of Palmer amaranth seed production, crop safety, and economic benefits. The results showed that the combination of pre-emergence herbicides and post-emergence herbicides provided high weed control and reduced the seed production of Palmer amaranth. The use of pre-emergence herbicides with multiple sites of action in herbicide-resistant soybean was supported, and glufosinate was found effective in controlling glyphosate-resistant Palmer amaranth.
Article
Agronomy
Jasmine Mausbach, Suat Irmak, Debalin Sarangi, John Lindquist, Amit J. Jhala
Summary: Effective herbicide programs are available for controlling ALS inhibitor/GR Palmer amaranth in isoxaflutole/glufosinate/glyphosate-resistant soybean without causing soybean injury. Soybean yield in 2019 was relatively higher compared to 2018 due to higher precipitation, with generally no differences between herbicide programs.
Article
Agronomy
Meghan Dilliott, Nader Soltani, David C. Hooker, Darren E. Robinson, Peter H. Sikkema
Summary: Adding specific herbicides to glyphosate + dicamba applied preplant can improve the level and consistency of control against glyphosate/dicamba-resistant Canada fleabane in soybean.
Article
Agronomy
Xiaoxing Yu, Yongzheng Sun, Chaoyang Lin, Pengfei Wang, Zhicheng Shen, Yu Zhao
Summary: The use of dual herbicide-tolerant corn, such as SCB-29, in China at the early stage of GM corn release can effectively delay the development of weed resistance to herbicides. SCB-29 is a transgenic maize event that expresses both cp4 epsps and bar genes, making it tolerant to high doses of glyphosate and glufosinate. This event has stable integration of transgenes and shows similar agronomic performances to non-transgenic maize, making it an excellent candidate for commercialization.
Article
Agronomy
Vitor Simionato Bidoia, Jose Cristimiano dos Santos Neto, Cleber Daniel de Goes Maciel, Leandro Tropaldi, Caio Antonio Carbonari, Stephen Oscar Duke, Leonardo Bianco de Carvalho
Summary: This study examined the effects of recommended application rates of glyphosate on glyphosate-resistant maize. The results showed that glyphosate had no significant effects on the growth, grain composition, mineral content, grain quality, or yield of GR maize.
Article
Agronomy
Vipan Kumar, Jatinder S. Aulakh, Rui Liu, Amit J. Jhala
Summary: This study found that late-POST applications of glufosinate-based programs may effectively control tall glyphosate-resistant Palmer amaranth in DGG-resistant soybeans and also have an impact on soybean grain yields.
AGROSYSTEMS GEOSCIENCES & ENVIRONMENT
(2023)
Review
Agronomy
Caio A. C. G. Brunharo, Roger Gast, Vipan Kumar, Carol A. Mallory-Smith, Breanne D. Tidemann, Hugh J. Beckie
Summary: HR crops play an important role in integrated weed management in the United States and Canada. However, the widespread cultivation of HR crops has led to the evolution of HR weed populations. Proper stewardship of HR crops can reduce herbicide use and selection pressure on weeds. Careful planning of crop rotation and maximizing crop competition is essential for managing HR weed populations effectively.
Article
Plant Sciences
Vijay Singh, Tianyi Dou, Mark Krimmer, Shilpa Singh, Dillon Humpal, William Z. Payne, Lee Sanchez, Dmitri V. Voronine, Andrey Prosvirin, Marlan Scully, Dmitry Kurouski, Muthukumar Bagavathiannan
Summary: The non-judicious use of herbicides has led to the widespread evolution of herbicide resistance in various weed species, such as Palmer amaranth. Raman spectroscopy can be utilized as a rapid, non-destructive diagnostic tool to differentiate between glyphosate-resistant and -susceptible weed populations. The study demonstrates the utility of Raman spectra for evaluating herbicide resistance and stress response in plants under field conditions.
FRONTIERS IN PLANT SCIENCE
(2021)
Article
Agronomy
Rui Liu, Vipan Kumar, Amit Jhala, Prashant Jha, Phillip W. Stahlman
Summary: Various herbicide programs were evaluated for controlling glyphosate- and mesotrione-resistant Palmer amaranth in glyphosate- and glufosinate-resistant corn. Results showed that effective PRE fb EPOST herbicide programs can provide efficient control of resistant Palmer amaranth and increase corn grain yield and net economic return.
Article
Environmental Sciences
Leandro Galon, Leonardo Brunetto, Antonio Marcos Loureiro da Silva, Vinicius Soligo, Daniel Cristian Cavaletti, Alexandre Ferreira da Silva, Alessandra Gallina, Milena Barretta Franceschetti, Cesar Tiago Forte, Gismael Francisco Perin
Summary: Herbicide tank-mixing is often carried out by farmers to control weeds in crops. This study evaluated the selectivity of increasing doses of herbicides on maize crops, showing that 2,4-D mixed with glyphosate caused severe phytotoxicity symptoms on maize but did not affect yield and growth characteristics. Increasing doses of 2,4-D caused severe phytotoxicity on hybrid Status VIP3, while increasing doses of glyphosate did not show phytotoxicity symptoms in the maize hybrid SX 5885 VIP3.
JOURNAL OF ENVIRONMENTAL SCIENCE AND HEALTH PART B-PESTICIDES FOOD CONTAMINANTS AND AGRICULTURAL WASTES
(2021)
Article
Agronomy
Victor Fabian Juan, Federico Roberto Nunez Fre, Horacio Maria Saint-Andre, Ricardo Robustiano Fernandez
Summary: This study identified a Brassica rapa biotype resistant to 2,4-D herbicides, with a resistance index of 4.7, requiring approximately five-fold higher doses to achieve 50% inhibition of survival compared to the susceptible biotype. Among the different 2,4-D formulations available in Argentina, the 2,4-D acid microemulsion formulation showed the highest control efficiency and biomass reduction for the resistant biotype. The resistant biotype also exhibited cross-resistance to clopyralid, dicamba, and picloram, with maximum phytotoxicity of 25% even when treated with four times the recommended dose without biomass reduction.