Ten years of Cry1Ac Bt soybean use in Argentina: Historical shifts in the community of target and non-target pest insects

Jerez, Paula Gabriela Páez; Hill, Jorge G.; Pereira, E. J. G.; Alzogaray, Raúl A.; Vera, M. Teresa

doi:10.1016/j.cropro.2023.106265

Cited by 3 publications

(4 citation statements)

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“…50 values for the Rnu-COR and Cin-TUC populations were 4.1-and 54-fold those reported for the susceptible reference population of C. includens in Brazil during 2018-2020(Horikoshi et al 2021a). There are several possible reasons why resistance has evolved.…”

mentioning

confidence: 78%

“…Notably, Argentina ranks as the third-largest global soybean producer, where transgenic varieties cover 97% of the crop acreage, 28% being Bt soybeans (SISA 2022). This large-scale adoption causes intense selection pressure on target pest populations, especially in the northern of the country, and can lead to shifts in the associated pest community with the resurgence of primary pests as well as secondary pest outbreaks (Martins-Salles et al 2017; Páez Jerez et al 2023). Hence, research efforts to develop effective insect resistance management (IRM) programs remain a priority.…”

Section: Introductionmentioning

confidence: 99%

“…Their larvae feed on several high-value crops, such as soybean, sun ower (Helianthus annus L.), alfalfa (Medicago sativa L.), cotton (Gossypium hirsutum L.), and various aromatic plants (Eichlin and Cunningham 1978;Lafontaine and Poole 1991). Larvae of these species cause defoliation in different soybean growth stages, particularly the early reproductive stages, when owering and pod initiation have started (Murúa et al 2018;Páez Jerez et al 2023).…”

Section: Introductionmentioning

confidence: 99%

“…These results, together with ours, indicate that the presence of Cry1Ac-resistant R. nu individuals is recent in Argentina, calling for an assessment of their spread through the main soybean-producing areas of the country(Szwarc et al 2022). In a eld study byPáez Jerez et al (2023), there was a greater abundance of target lepidopterans in Cry1Ac Bt soybean elds, reinforcing the need for more follow-up research.…”

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confidence: 99%

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Field-evolved resistance of Rachiplusia nu to Cry1Ac Bt soybean in Argentina

Hill,

Jerez,

Linares

et al. 2023

Preprint

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Large-scale adoption of genetically engineered soybeans expressing insecticidal proteins from Bacillus thuringiensis (Bt) in South America allow us to understand the ability of pest populations to evolve resistance to Bt crops. Here, we examined the susceptibility of Rachiplusia nu (Guenée) and Chrysodeixis includens (Walker) (Noctuidae: Plusiinae) collected from Cry1Ac Bt and non-Bt soybean fields in Argentina, specifically in the Provinces of Santiago del Estero (Rnu-SE), Córdoba (Rnu-COR), and Tucumán (Cin-TUC), to Cry1Ac toxin. In Cry1Ac-overlay bioassays, the lethal concentration to kill 50% of the larvae (LC50) of Rnu-COR and Cin-TUC populations were 113 and 1,500 ng/cm2, respectively. The lower limit of the LC50 value for Rnu-SE larvae was > 21,679 ng/cm2, at least 14-fold the LC50 value for Cin-TUC larvae and at least 192-fold the LC50 value for Rnu-COR larvae. A similar pattern emerged from the effective Cry1Ac concentrations that inhibited 50% of larval growth. In larval feeding assays using Bt soybean leaves, Rnu-SE insects had higher survival rates than Rnu-COR and Cin-TUC ones. In behavioral assays with Bt and non-Bt soybean plants, the R. nu moths showed a strong oviposition preference for the Cry1Ac Bt over non-Bt soybean plants. These results indicate that a population of R. nu evolved Cry1Ac resistance in Argentina, consistent with the increased number of plusiine loopers causing unexpected damage in Cry1Ac Bt soybean fields. That may correlate with moth oviposition behavior, and further research should guide locally adapted strategies to minimize the resistance drawbacks and maximize the benefits of Bt crops.

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mentioning

confidence: 78%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

mentioning

confidence: 99%

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Field-evolved resistance of Rachiplusia nu to Cry1Ac Bt soybean in Argentina

Hill,

Jerez,

Linares

et al. 2023

Preprint

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Impact of Amaranthus spp. weed presence on the population abundance of Spodoptera cosmioides (Lepidoptera: Noctuidae) in genetically engineered soybean crops

Hill,

Páez Jerez,

Fernández

et al. 2025

Crop Protection

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Behavior and damage potential of the newly emerged pest Myochrous armatus (Chrysomelidae: Eumolpinae) on soybean plants in Brazil

Perini,

Pinheiro,

Rodrigues

et al. 2024

J Applied Entomology

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Myochrous armatus Baly, 1865 (Coleoptera: Chrysomelidae) has expanded its occurrence significantly into soybean‐growing areas of Brazilian Cerrado and became an important early‐season soil pest. Experiments were performed under field conditions from 2020 to 2023 to assess several aspects: (1) population behaviour over crop season and offseason; (2) day/night behaviour during the early stages of soybean plants and (3) injury to plants and potential damage to soybean yield to establish the Economic Injury Level (EIL). Adults of the M. armatus population presented a season‐long abundance during the specific period from late October to January, with major captures in November and December (end of Spring), either inside or on the edge of soybean fields. Weeds and volunteer plants of corn and cotton hosts adults and eggs. These findings suggest an univoltine life cycle. Behavioural assessments revealed that M. armatus does not exhibit a specific day, night or crepuscular behaviour, performing deeds at any time. The majority of insects (40% to 70%) were found in the soil throughout the day and night. Adults feed on soybean plants by scraping or cutting the stem, cotyledon, petiole and apical sprouting. Their preference is initially for the stem and cotyledon (up to 14 days after emergence), and later for the petiole (after 21 days of emergence). After 7 days of coexistence at V1‐V3 soybean stages, we observed a potential yield reduction of 35% for each insect per plant. Dynamic EIL estimations are between 0.4 and 1.9 adults per row metre, depending on the grower productivity expectation, control costs and soybean market value. Our results are fundamental for establishing Integrated Pest Management for M. armatus in soybean and other crop systems.

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Ten years of Cry1Ac Bt soybean use in Argentina: Historical shifts in the community of target and non-target pest insects

Cited by 3 publications

References 46 publications

Field-evolved resistance of Rachiplusia nu to Cry1Ac Bt soybean in Argentina

Field-evolved resistance of Rachiplusia nu to Cry1Ac Bt soybean in Argentina

Impact of Amaranthus spp. weed presence on the population abundance of Spodoptera cosmioides (Lepidoptera: Noctuidae) in genetically engineered soybean crops

Behavior and damage potential of the newly emerged pest Myochrous armatus (Chrysomelidae: Eumolpinae) on soybean plants in Brazil

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