MORTALIDADE DE ABELHAS SEM FERRÃO Scaptotrigona bipunctata SOB OS EFEITOS DOS HERBICIDAS PARAQUAT E DIQUAT

Peruzzolo, Marina Carvalho; Grange, Luciana; Ronqui, Ludimilla

doi:10.25110/arqvet.v24i1cont.2021.8408

Cited by 4 publications

(3 citation statements)

References 35 publications

(40 reference statements)

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“…A similar situation is observed in the aquatic environment, where PQ’s availability is restricted because it is adsorbed by particles and sediment ( Thi Hue et al, 2018 ). This situation seems to explain the few studies conducted to assess its toxicity for the environment in the Cerrado biome [influence of PQ on mortality of tadpoles ( Lajmanovich et al, 1998 ) and native bees ( Peruzzolo et al, 2021 ) and potential danger for freshwater species ( Lundberg, 2021 )], although the Brazilian Cerrado has been intensively used for agricultural purposes since the 1980s, involving the use of herbicides such as PQ. However, the current use of good agricultural practices in the Cerrado, such as no-till agriculture, seems not to prevent the environmental impacts of herbicides like PQ, because it aims for the expansion and profitability of large-scale farming based on input-intensive practices instead of sustainable agriculture processes ( Ofstehage and Nehring, 2021 ).…”

Section: Resultsmentioning

confidence: 99%

“…Few studies have been conducted about the impacts of PQ on the Cerrado biome: Lajmanovich ( Lajmanovich et al, 1998 ) concludes that the tadpole Scinax nasica present in Cerrado regions underwent increased mortality when exposed to 30.0 and 50.0 mg PQ/L. Peruzzolo ( Peruzzolo et al, 2021 ) indicate that the ingestion of PQ increases the mortality of Scaptotrigona bipunctata , a native bee found in the Cerrado; Lundberg ( Lundberg, 2021 ) considered the use of herbicides in soybean crops between 2016 and 2018 and points out that PQ displays a very high potential impact on freshwater species because of the high value of its ecotoxicity, as measured by chemical toxic unit (CTU per kg released). Finally, the Brazilian ban on PQ use was based on its mutagenic potential in human germ cells in contact with this herbicide.…”

Section: Introductionmentioning

confidence: 99%

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The effect of water molecules on paraquat salts: from physicochemical properties to environmental impact in the Brazilian Cerrado

Aguiar,

Costa,

Borges

et al. 2023

Front. Chem.

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Introduction: The green revolution model that is followed in the Brazilian Cerrado is dependent on mechanization, chemical fertilization for soil dressing and correction, and the use of herbicides. Paraquat is a methyl viologen herbicide marketed as bipyridylium dichloride salts and used (in low doses) to combat weeds in their post-emergence stage. It is a non-selective pesticide that causes the peroxidation of the lipids that make up the cell membrane, and when it comes into contact with foliage, it results in the death of the plant.Methods: The effect of water molecules co-crystallized in Paraquat salt structures was analyzed in anhydrous, dihydrate, and trihydrate forms to understand those physicochemical properties in its redox activity. The frontier molecular orbitals were also carried out using DFT to obtain the chemical reactivity of the bipyridylium cation. Finally, the supramolecular arrangements were evaluated to analyze the physicochemical stability and acquire insights on superoxide anions.Results and discussion: The electronic structure indicated that the BP cation presents an acidic character due to its low ELUMO value, while the salt has a more basic character due to its high EHOMO value. For this reason, the BP ion is more susceptible to reduction during the weeds’ photosynthesis process. During the process of plant photosynthesis, PQ is reduced to form a stable radical cation. In the supramolecular arrangement, the presence of water molecules increases the number of strong H-bonds, while the weak/moderate H-bonds are stabilized. PQ’s toxic effects are observed in wildlife, domesticated animals, human populations, and ecosystems. The influence of PQ on the terrestrial environment is limited because of the soil adsorption capacity associated with good agricultural practices. The current use of good agricultural practices in the Cerrado seems not to prevent the environmental impacts of herbicides like PQ because it aims for the expansion and profitability of large-scale farming based on input-intensive practices instead of sustainable agriculture processes.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

The effect of water molecules on paraquat salts: from physicochemical properties to environmental impact in the Brazilian Cerrado

Aguiar,

Costa,

Borges

et al. 2023

Front. Chem.

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“…Air and water contamination by these herbicides exposes insects and other living beings, including humans, to the risk of harmful effects. For example, suspended particles of herbicides have easy contact with bees, which carry the molecule to the hive, contaminating others bees (Peruzzolo, Grange and Ronqui, 2021;Basso et al, 2022;Jung et al, 2023).…”

Section: Introductionmentioning

confidence: 99%

Seeding density and lodging control using a calcium and potassium-based organomineral fertilizer in oat crops

Coppetti,

Da Silva,

Carvalho

et al. 2024

CLCS

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Technologies ensuring high crop yield and plant competitiveness without lodging can contribute to an efficient and sustainable management of oat crops. The objectives of this study were to evaluate the use of high seeding density in current oat cultivars grown in the northwestern Rio Grande do Sul (RS), Brazil; assess the effects of plant growth regulators on grain yield indicators, industrial grain quality, and stem structure; and evaluate a calcium and potassium-based organomineral product as a sustainable technology for controlling lodging. Two experiments were conducted in Augusto Pestana, RS, in a randomized block design. Experiment I (2021) was set up in a 4×3 factorial arrangement consisted of 4 oat seeding densities (100, 300, 600, and 900 seeds m-2) and 3 treatments with plant growth regulator (PGR) application (control; application of trinexapac-ethyl and organomineral product at the stage between the 1st and 2nd visible stem nodes). Experiment II (2022) was set up in a 4×4 factorial arrangement consisted of 4 seeding densities (100, 300, 600, and 900 seeds m-2) and 4 PGR application treatments (control; application of trinexapac-ethyl and organomineral product at the stage between the 1st and 2nd visible stem nodes; and sequential application of organomineral product at V4 and at the stage between the 1st and 2nd visible stem nodes). The results of both experiments showed the need for a higher seeding density (between 400 and 520 seeds m-2) than that recommended. High air temperatures and limiting soil water conditions increased the phytotoxic potential of trinexapac-ethyl in oat crops. Evaluations of the Ca and K-based organomineral product, as a sustainable technology for controlling plant lodging, requires further analysis in years with more favorable environmental conditions for oat crops.

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Alternativas de herbicidas para dessecação de áreas em pousio

Ribeiro¹,

Corrêa

Silva

et al. 2023

Braz. J. of Sci.

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As plantas daninhas interferem diretamente na produção agrícola, além de servir como hospedeiras para pragas e doenças. O período que antecede a semeadura e emergência da cultura consiste em um dos mais importante, por isso a dessecação em pré semeadura é essencial. Dessa forma, estabelecer alternativas para maior espectro de controle de plantas daninhas é essencial para a sustentabilidade do sistema de manejo. Assim, objetivou avaliar moléculas de herbicidas para o controle de plantas daninhas no manejo de dessecação em áreas de pousio. O experimento foi conduzido na área experimental da Fazenda de Ensino e Pesquisa da Faculdade UniBRÁS, na zona rural do município de Rio Verde, Estado de Goiás, Brasil. O delineamento experimental utilizado foi em blocos casualizados com 9 tratamento, e 4 repetições. A unidade experimental foi composta por um retângulo de 2 x 12,5 m respectivamente por tratamento, perfazendo uma área de 25 m² por unidade experimental e uma área total para o ensaio de 800 m². Os tratamentos foram: (T1) Controle, (T2) Diquat, (T3) Diquat + Glifosato, (T4) Saflufenacil, (T5) Saflufenacil + Glifosato, (T6) Glufosinato, (T7) Glufosinato + Glifosato, (T8) Carfentrazone e (T9) Carfentrazone + Glifosato. As avaliações de controle das plantas daninhas foram realizadas aos 2, 5, 7, 10, 14 e 21 dias após aplicação, realizadas por escala visual com a atribuição de notas 0 a 100%. Os dados foram submetidos à análise de variância pelo teste F e as médias comparadas pelo teste de Tukey a 5% de probabilidade. O tratamento T7 promoveu 94,5% de controle das plantas daninhas, os tratamentos T6 e T10 também apresentaram alta eficiência no manejo de dessecação embora inferiores.

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MORTALIDADE DE ABELHAS SEM FERRÃO Scaptotrigona bipunctata SOB OS EFEITOS DOS HERBICIDAS PARAQUAT E DIQUAT

Cited by 4 publications

References 35 publications

The effect of water molecules on paraquat salts: from physicochemical properties to environmental impact in the Brazilian Cerrado

The effect of water molecules on paraquat salts: from physicochemical properties to environmental impact in the Brazilian Cerrado

Seeding density and lodging control using a calcium and potassium-based organomineral fertilizer in oat crops

Alternativas de herbicidas para dessecação de áreas em pousio

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