Effect of cotton herbicide programs on weed population trajectories and frequency of glyphosate-resistant Palmer amaranth (<i>Amaranthus palmeri</i>)

Oreja, Fernando H.; Inman, Matthew D.; Jordan, David L.; Vann, Matthew C.; Jennings, Katherine M.; León, Ramón G.

doi:10.1017/wsc.2022.41

Cited by 3 publications

(3 citation statements)

References 45 publications

(50 reference statements)

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“…In the absence of additional management tactics, we can expect continual additions of weed seed to the seedbank. In other studies, the addition of herbicide to the production system further reduces the population growth rate compared with the levels seen in our study and alters weed community composition trajectories from season to season (Oreja et al 2021(Oreja et al , 2022a(Oreja et al , 2022b.…”

Section: Annual Rate Of Weed Population Change (δ)contrasting

confidence: 39%

Demographics of Palmer amaranth (Amaranthus palmeri) in annual and perennial cover crops

Weisberger,

Leon,

Gruner

et al. 2023

Weed Sci

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Palmer amaranth (Amaranthus palmeri S. Watson) is the most problematic weed of cotton cropping systems in the Southeast US. Heavy reliance on herbicides has selected for resistance to multiple herbicide mechanisms of action. Effective management of this weed may require the integration of cultural practices that limit germination, establishment, and growth. Cover crops have been promoted as a cultural practice that targets these processes. We conducted a two-year study in Georgia, USA, to measure the effects of two annual cover crops (cereal rye [Secale cereale L.] and crimson clover (Trifolium incarnatum L.), a perennial living mulch (Durana® white clover, (Trifolium repens L.), and a bare ground control on A. palmeri population dynamics. The study was conducted in the absence of herbicides. Growth stages were integrated into a basic demographic model to evaluate differences in population trajectories. Cereal rye treatments suppressed weed seedling recruitment (seedlings seed-1) by 19.2 and 13 times, and living mulch 12 and 25 times more than the bare ground control. Low recruitment was correlated positively with low light transmission (above canopy PAR/below cover crop PAR) at the soil surface. Low recruitment rates were also negatively correlated with high survival rates. Greater survival rates and reduced adult plant densities resulted in greater biomass (g plant-1) and fecundity (seeds plant-1) in cereal rye and living mulch treatments in both years. The annual rate of population change (seeds seed-1) was equivalent across all treatments in the first year but was greater in the living mulch treatment in the second year. Our results highlight the potential of annual cover crops and living mulches for suppressing A. palmeri seedling recruitment and would be valuable tools as part of an integrated weed management strategy.

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Section: Annual Rate Of Weed Population Change (δ)contrasting

confidence: 39%

Demographics of Palmer amaranth (Amaranthus palmeri) in annual and perennial cover crops

Weisberger,

Leon,

Gruner

et al. 2023

Weed Sci

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“…Despite the problems that a misuse of HR crops could have in terms of selection pressure for herbicide resistance traits in weeds, the adoption of HR crops within integrated weed management (IWM) programmes could help reduce the incidence of resistance evolution (Owen et al, 2015). For example, the adoption of dicamba‐resistant cotton varieties in fields with a high pressure of glyphosate‐resistant A. palmeri population demonstrated to be successful in reducing HR population (Oreja et al, 2022). IWM programmes must be carefully designed by considering the inclusion of HR and non‐HR crops in rotations, even rotating HR crops with resistance to different herbicides, using different MOAs, and maximizing crop competition to effectively suppress weed populations and minimise herbicide selection pressure (Brunharo et al, 2022; Vila‐Aiub et al, 2019).…”

Section: Discussionmentioning

confidence: 99%

Herbicide‐resistant weeds from dryland agriculture in Argentina

Oreja,

Moreno,

Gundel

et al. 2024

Weed Research

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We reviewed and performed a quantitative synthesis on herbicide‐resistant weeds from rain‐fed crops in Argentina. Twenty‐four weed species distributed in the main extensive crops (soybean, maize, wheat, barley, oilseed rape, sunflower, chickpea and peanut) have evolved herbicide resistance. Of the total, 54% are grasses, 88% are annual species and 63% are cross‐pollinated species. The most representative families were Poaceae with 54% resistant species, followed by Brassicaceae with 17%, and Asteraceae with 13%. Buenos Aires, Santa Fe and Córdoba were the provinces with the most documented cases of resistance (35%, 33% and 30%, respectively). The proportion of cases resistant to pre‐emergence herbicides was 10%, whereas the proportion of cases resistant to post‐emergence herbicides was 90%. Glyphosate was the herbicide with the highest incidence (92%) of resistance among weed species, followed by 29% of species that evolved resistance to ALS‐inhibiting herbicides. Whereas resistance to auxin‐like herbicides comprised 17% of the weed species, acetyl‐CoA carboxylase (8%) and protoporphyrinogen oxidase (4%) inhibiting herbicides showed the least incidence of resistance evolution among weeds. The highest number of resistant species was identified in soybean (19), followed by maize (13), wheat/barley (10) and fallow (9). Weed species with a higher number of resistant populations to a higher number of herbicide mode of action were Amaranthus hybridus, A. palmeri, Lolium multiflorum and Raphanus sativus. The change in the production system since the mid‐1990s, based on the use of herbicides (glyphosate mainly) to control weeds, is likely to account for the notorious increase in the average rate of evolution of herbicide‐resistant weeds in Argentina.

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“…With A. palmeri evolving both target and nontarget site resistance mechanisms to the commonly used herbicides in cotton, it is important to diversify the available weed management strategies by combining chemical and nonchemical strategies to achieve sustainable long-term weed control (Norsworthy et al, 2012). Dicamba-based herbicide programs have shown promise in providing long-term weed control in cotton (Oreja et al, 2022). Multiple POST applications of dicamba provide greater A. palmeri control compared to a single POST application (Cahoon et al, 2015).…”

Section: Introductionmentioning

confidence: 99%

Herbicide programs, cropping sequences, and tillage-types: a systems approach for managing Amaranthus palmeri in dicamba-resistant cotton

Vulchi,

Nolte,

McGinty

et al. 2023

Front. Agron.

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Herbicide-resistant Amaranthus palmeri poses a significant threat to cotton production in the US. Tillage, cover crops, crop rotations, and dicamba-based herbicide programs can individually provide effective control of A. palmeri, but there is a lack of research evaluating the above tactics in a system for its long-term management. Field trials were conducted near College Station and Thrall, TX (2019–2021) to evaluate the efficacy of dicamba-based herbicide programs under multiple cropping sequences and tillage types in a systems approach for A. palmeri control in dicamba-resistant cotton. The experimental design used was a split–split plot design. The main plots were no-till cover cropping, strip tillage, and conventional tillage. The subplots were cotton:cotton:cotton (CCC) and cotton:sorghum:cotton (CSC) sequences for 3 years within each tillage type, and sub-subplots were a weedy check (WC), a weed-free check (WF), a low-input program without residual herbicides (LI), and a high-input program with residual herbicides (HI). Using HI under the CSC sequence was the only system that provided >90% control of A. palmeri for 3 years across all tillage types and locations. By 2021, A. palmeri densities in the CSC sequence at College Station (4,156 plants ha−1) and Thrall (4,006 plants ha−1) are significantly low compared to the CCC sequence (31,364 and 9,867 plants ha−1, respectively) when averaged across other factors. Similarly, A. palmeri densities in HI at College Station (9,867 plants ha−1) and Thrall (1,016 plants ha−1) are significantly low compared to LI (25,653 and 13,365 plants ha−1, respectively) when averaged across other factors. We also observed that the CSC sequence reduced A. palmeri seed bank by at least 40% compared to the CCC sequence at both College Station and Thrall when averaged across other factors. Over 3 years, we did not observe significant differences between LI and HI for cotton yields at College Station (1,715–3,636 kg ha−1) and Thrall (1,569−1,989 kg ha−1). However, rotating cotton with sorghum during 2020 improved cotton yields by 39% under no-till cover cropping in 2021 at Thrall. These results indicate that using dicamba-based herbicide programs with residual herbicides and implementing crop rotations can effectively manage A. palmeri in terms of seasonal control, densities, and seed bank buildup across tillage types and environments.

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Effect of cotton herbicide programs on weed population trajectories and frequency of glyphosate-resistant Palmer amaranth (Amaranthus palmeri)

Cited by 3 publications

References 45 publications

Demographics of Palmer amaranth (Amaranthus palmeri) in annual and perennial cover crops

Demographics of Palmer amaranth (Amaranthus palmeri) in annual and perennial cover crops

Herbicide‐resistant weeds from dryland agriculture in Argentina

Herbicide programs, cropping sequences, and tillage-types: a systems approach for managing Amaranthus palmeri in dicamba-resistant cotton

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