IPTSP - Artigos publicados em periódicos

URI Permanente para esta coleçãohttp://200.137.215.59//handle/ri/1311

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Agora exibindo 1 - 20 de 1824

Contratos de integração e a sustentabilidade: a convergência da agenda ESG no agronegócio brasileiro
(2025) Barros, Patrícia Campos; Lacerda, Murilo Couto; Santos, Nivaldo dos
This article investigates the importance of integration contracts in Brazilian agribusiness, highlighting their role in formalizing agreements and ensuring the legal security of economic relations. The research question lies in the asymmetric dynamics that permeate these contracts, where producers often face vulnerabilities and limitations in negotiation. In a context of growing demand for socio-environmental responsibility, driven by the ESG (Environmental, Social, and Governance) Agenda, it is necessary to revise integration contracts to incorporate sustainable practices that promote equity in contractual relationships. The methodology adopted is applied, qualitative, and bibliographic, utilizing a systematic literature review, including legislation, academic articles, and relevant studies. Data collection was conducted using academic databases, and critical analysis of the selected texts allowed us to identify key concepts, trends, and gaps in the discussion on integration contracts and sustainable practices. The main objectives include analyzing the intersection between integration contracts and the ESG Agenda, investigating how sustainable practices can contribute to equity in contractual relationships, and discussing the adequacy of contracts to contemporary socio-environmental responsibility requirements. This article emphasizes the need to restructure integration contracts, aiming not only at the economic viability of companies, but also at protecting producers' rights and sustainable development in Brazilian agribusiness.
Certificação de unidades armazenadoras de grãos: contextualização sobre a importância da adoção do requisito técnico identificador de transgenia
(2025) Rabelo, Juliano Caldas; Santos, Nivaldo dos; Rabelo, Kássia Cristina de Caldas; Furquim, Maria Glaúcia Dourado; Sousa Júnior, José Carlos de
This research provides a context for the certification processes in storage units, analyzing the legal instruments used by those units to support the technical requirements for certification. Through bibliographical research, the aim of this study was to correlate the laws, decrees and other instruments that guide the requirements of certification processes with other literature relevant to this subject, containing aspects related to biotechnology, biodiversity and sustainability. There is an explanation for the recommendation by the certification process to adopt the technical requirement of identifying GMOs in certified warehouses, demonstrating the importance of using this tool to separate GMOs from conventional grains. The inherent aspects of soybean production with GMO events are presented, and that model is compared with the conventional production model. The production, consumption and safety of GMOs are discussed, in contrast to the decision of some nations to consume conventionally produced food. Thus, factors that attest to the fact that GMO food production is safe for society and the environment are presented, demonstrating the scientific basis of some nations that choose to produce and consume food with GMO events, adopting strict management control criteria.
Direito a desconexão do trabalhador da jornada de trabalho
(2025-07) Souza, Gustavo Henrique Caetano de; Santos, Nivaldo dos
The present article aims to investigate the impact of the evolution of communication through social media on the workday, focusing on the resulting issues and their legal implications; and to analyze the judgments of the Regional Labor Court (TRT). With the evolution of technology, some devices, such as cell phones, have been excessively used, forcing workers to be connected around the clock, having to respond to their employers' orders almost constantly, receiving messages instantly, every day at any time, even outside the established working hours in their employment contract and in the Consolidation of Labor Laws. In this article, secondary data from research available in institutes and other publications, as well as academic papers discussing the theme of technology in the workday as a study object, were used.
A função social da propriedade e a responsabilidade penal por crimes ambientais no agronegócio: uma análise jurídica e sustentável
(2025) Gomes, Giovano Fonseca; Silvério Júnior, João Porto; Santos, Nivaldo dos
This article aims to analyze the relationship between the social function of property and criminal liability for environmental crimes committed within the Brazilian agribusiness sector, focusing on the protection of permanent preservation areas. Using a theoretical approach, it seeks to understand how the legal concepts of the social function of property and environmental criminal liability can be applied harmoniously, considering the specificities of the Brazilian socio-environmental context. The research, of a qualitative nature, employs bibliographical review and analysis of doctrine, legislation, and jurisprudence, addressing the principles of constitutional, civil, and criminal law. The specific objectives include analyzing the social function of property with an emphasis on environmental law, identi-fying the main types of environmental crimes related to agribusiness activities, and examining the applicability of environmental criminal liability. The study contributes to the legal debate on the role of agribusiness in sustainability, offering reflections on aligning agricultural production with environmental preservation.
A produção de café orgânico e o direito ao desenvolvimento
(2025) Santos, Maxwel Araújo; Santos, Nivaldo dos
This article aims to analyze the contractual challenges in sustainable models of organic coffee production, proposing the strengthening of syntropic agriculture in coffee cultivation. To this end, the specific objectives are to critically examine the principles, rules, and legislation regulating organic coffee production in the state of Goiás, and to assess the applicability of syntropic agriculture models in this context. The adopted methodology consisted of theoretical, documentary, and bibliographic research, with a systematic analysis of relevant legal doctrine and legislation. As a central hypothesis, it is argued that the adoption of processes known as syntropic agriculture is the most effective alternative to boost organic coffee production in Brazil. The research findings indicate the need for greater legisla-tive flexibility, as well as the granting of incentives to this model. The consumer emerges as the main beneficiary of this transition, reinforcing the effectiveness of the principle of the Right to Development.
Regulação jurídica das propriedades rurais no Brasil
(2025) Aguiar, Vitor Spadoni; Ferreira, Rildo Mourão; Santos, Nivaldo dos
This study aims to analyze the legal regulation of rural properties in Brazil, highlighting the main legal and normative aspects that guide the ownership, use, and exploitation of rural land. The research seeks to understand how Brazilian laws, such as the Civil Code, the Statute of the Land, and the Forest Code, impact agricultural development, environmental preservation, and the rights of rural workers. The legal regulation of rural properties aims to balance economic, social, and environmental interests but faces challenges related to enfor-cement, the implementation of regulations, and support for small producers and traditional communities. Furthermore, the analysis addresses disparities in land access, involving land--related issues and the struggle for social justice in rural areas, particularly concerning land reform and land distribution. The methodology used for the study is a literature review, allowing a synthesis of the main academic discussions on the topic. The conclusion points to the need for a regulation more adapted to local realities and efficient enforcement to ensure sustainability and equity in the use of rural land in Brazil.
Utilization of hardened Phaseolus lunatus beans as a source of 2 naturally occurring bioactive peptides
(2025) Araújo, Renata Borges; Paula, Ladyslene Christhyns de; Batista, Karla de Aleluia; Lemes, Ailton Cesar; Oliveira, Thiago Sardinha de; Neri, Hiasmin Franciely da Silva; Santos, Elize Leonice da Rocha; Ghedini, Paulo César; Silva, Kátia Flávia Fernandes
Hardened beans are rejected by consumers and frequently used as animal feed despite their unchanged nutritional content afterhardening. Particularly, hardened beans remain a rich source of protein and carbohydrates in a hungry world. There are several studies describing encrypted bioactive peptides; however, little is known about naturally occurring peptides and their functionalities. In this study, naturally occurring peptides from hardened Phaseolus lunatus were extracted, partially purified and examined regarding their biological potential. Extractor solutions were tested to obtain the maximum yield and antioxidant activity. The most nonpolar was the more effective for obtaining antioxidant peptides (DPPH -962±29 and FRAP -2567±83 μmol Trolox/mg protein). Treatment for 30 minutes/90 ºC increased 2.6-fold (2497 μmol Trolox/mg protein) the antioxidant activity by DPPH and 1.2-fold (3149 μmol Trolox/mg protein) the FRAP assay. Antioxidant peptides in the <3kDa-fraction resisted gastric/intestinal digestion and presented anti-peroxidative activity close to the BHT. Finally, peptides presented vasorelaxant activity in the range of 30% (F<3 kDa) and 17% (hydrolyzed F<3 kDa) and ACE-inhibitory activity in the range of 15% (F<3 kDa) and 85% (hydrolyzed F<3 kDa).
Governança privada e agronegócio: análise da certificação RTRS sob a perspectiva de sustentabilidade e inovação na sojicultura brasileira
(2025) Gomes, Cárita Batista Andrade; Santos, Nivaldo dos; Merida, Carolina
Nephroprotective effect of a low-molecular-weight peptide fraction from common bean (Phaseolus vulgaris) against renal ischemia and reperfusion
(2025-12) Carvalho, J. H.; Berrio, Sixta Isabel Atencio; Graziani, Daniel; Rocha, J. V. M.; Campos, Hericles Mesquita; Pacheco, L. F.; Silva, C. N. S.; Abreu, A. R. R.; Gomes, Rodrigo Mello; Pedrino, Gustavo Rodrigues; Silva, Kátia Flávia Fernandes
Ischemia–reperfusion (I/R) injury contributes to acute kidney injury. Reactive oxygen species produced during tissue reoxygenation may be targeted by antioxidant molecules obtained from dietary sources. We previously showed that peptides smaller than 3 kDa (PV3) from common hardened bean (Phaseolus vulgaris) exert antioxidant and renal vasodilator effects. We next evaluated whether PV3 may mitigate the ischemic damage related to oxidative stress in the kidney. The diphenyl picrylhydrazyl method was used to evaluate the PV3 antioxidant activity in vitro. Human endothelial cells were incubated with diaminofluorescein diacetate and dihydroethidium to probe nitric oxide (NO) and reactive oxygen species, respectively; fluorescence was analyzed by confocal microscopy. In our in vivo tests (CEUA 057/22), we used Wistar rats that underwent a sham surgery or an I/R procedure and were treated with PV3 (50 μg/kg). Phosphate-buffered saline 1× was used to control for hypercapnia-related metabolic acidosis, and the control group received NaCl 0.9%. Ingestive parameters, metabolism, and renal function were evaluated in metabolic cages. PV3 exerted antioxidant effects and increased NO production in endothelial cells. In rats, PV3 reverted the deleterious effects of I/R on renal function and attenuated the I/R-evoked reductions in the activity of renal superoxide dismutase and catalase enzymes in a copper- and iron-dependent manner. In conclusion, PV3 attenuates the detrimental effects of I/R on renal function, most likely through its antioxidant and oxidonitrergic properties, thereby exerting nutraceutical benefits on pathophysiological processes driven by oxidative stress.
Naturally phosphorylated starch from Syzygium malaccense seeds: a promising functional ingredient
(2025-12) Morais, Danilo Átila Brigido de; Ferreira, Richard Douglas Rodrigues; Santos, Giordanna Prado; Alves, Guilherme L.; Batista, Karla de Aleluia; Silva, Kátia Flávia Fernandes
A naturally phosphorylated starch from Syzygium malaccense seeds was evaluated for its potential in dysphagia-oriented food formulations. Functional characterization included solubility, swelling, emulsification, phosphorus content, paste clarity, rheology, and digestibility. Additionally, starch preparations were classified according to the International Dysphagia Diet Standardization Initiative (IDDSI). Water solubility and swelling increased with temperature (50°C–90°C). Emulsifying capacity reached 51.6%, with 94.6% stability. The starch formed a clear paste (5.2% transmittance) and contained 48.1 mg P/100 g, exceeding commercial starches. After 180 min of digestion, 39.7% hydrolysis yielded a hydrolysis index of 15.88 and glycemic index of 48.44, values lower than those found for commercially available starches. Rheologically, it behaved as a non-Newtonian dilatant fluid without hysteresis. The IDDSI flow test showed that a 2% (w/v) starch suspension produces level 1–2 slightly thick fluid, and the IDDSI fork pressure test evidenced a level 4 starch gel, which is considered an extremely thickened or pureed food. Gathering the findings of this study, it is possible to conclude that S. malaccense starch exhibits desirable properties that enable it to be used as a thickener for liquid and solid dysphagia diets.
The mitochondrial genome of Melipona fasciculata and Melipona quadrifasciata: molecular evolution dynamics in stingless bees (Hymenoptera: Meliponini) mitogenomes
(2025) Jeronimo Corvalán, Leonardo Carlos; Carvalho, Larissa Resende; Dias, Renata de Oliveira; Ferreira, Ramilla dos Santos Braga; Gonçalves, Ariany Rosa; Brito, Cíntia Pelegrineti Targueta de Azevedo; Brito, Pedro Vale de Azevedo; Telles, Mariana Pires de Campos; Silva Neto, Carlos de Melo e; Nunes, Rhewter
Mitochondrial genomes serve as crucial data sources for evolutionary studies and the development of species conservation markers. However, due to the vast diversity of stingless bees, mitogenome research has been limited. Here, we assembled and annotated the mitochondrial genomes of Melipona fasciculata and M. quadrifasciata for a comparative analysis to explore the evolution of stingless bee (Meliponini) mtDNA. DNA sequences for M. fasciculata were obtained through total DNA sequencing, while those for M. quadrifasciata were sourced from public databases. The mitochondrial genomes of M. fasciculata and M. quadrifasciata span 15,207 bp (AT% = 87.08) and 15,341 bp (AT% = 87.95), respectively, and contain the typical 13 protein-coding genes (PCGs), 22 tRNA genes, and 2 rRNA genes found in insects. Comparative analysis with previously sequenced Meliponini genomes revealed a 10% increase in GC% in Indo-Malay/Australasian stingless bees, particularly in PCG regions. Meliponini mitogenomes displayed a high level of complex rearrangement events with five rearrangement blocks. Among the eight mitogenomes studied, tRNA genes exhibited greater mobility and involvement in genomic rearrangement events. NADH dehydrogenase subunit genes in the genera Melipona, Tetragonula, and LepidoTrigona showed higher nucleotide diversity compared to the standard Cox1 DNA barcode gene. We propose nad1, nad2, nad3, nad5, and atp6 as potential barcode genes for species discrimination within the Meliponini group. This study unveils two novel mitochondrial genomes and provides compelling evidence of the intricate evolution of Meliponini mitochondrial genomes.
Effect of the formulation with fipronil and fluazuron on the reproductive biology and ovaries histopathology of Rhipicephalus microplus engorged females
(2022-02) Secchis, Mirna Vieira; Vale, Letícia; Rodrigues, Daniel de Castro; Perinotto, Wendell Marcelo de Souza; Matos, Renata da Silva; Lopes, Thiago Rocha; Brito, Pedro Vale de Azevedo; Lopes, Welber Daniel Zanetti; Arruda, Walquiria; Monteiro, Caio Márcio de Oliveira
This study aimed to evaluate the effects of a commercial formulation containing fipronil and fluazuron on the reproductive biology and the morphology of ovaries from Rhipicephalus microplus engorged females. To carry out the study, three calves were artificially infested every 3 days with approximately 5000 larvae. On day 0, the animals were treated with a commercial formulation containing fipronil (1.25 mg/kg) + fluazuron (2.5 mg/kg). Before the application of the acaricide, engorged females of R. microplus were collected to constitute the control group (10 for biology analyses and 20 for histology analyses). After applying the commercial formulation, naturally detached engorged females were recovered on days + 5, + 10, and + 20 (10 engorged females/day) to evaluate their reproductive biology, and on days + 4, + 12, and + 20 (20 engorged females/day) for histological evaluation of the ovaries. Females from the treated groups produced smaller amounts of eggs, exhibiting lower viability when compared to eggs from the control group (p < 0.05). The ovaries of females from all treated groups (+ 4, + 12, and + 20) showed morphological changes, including: cytoplasmic disorganization, cytoplasmic degradation, irregular shape of the oocyte and germinal vesicle, reduction and vacuolization of yolk granules and oocyte disruption. Oocytes were observed in smaller numbers in all stages of development (I, II, III, IV, and V) and greater numbers of indeterminate oocytes were verified in the ovaries of the treated groups when compared to the control group. Therefore, results showed that the commercial formulation containing fipronil and fluazuron affected the reproductive biology, caused morphological changes in the ovaries, and reduced the number of oocytes in R. microplus engorged females.
Acaricidal activity of Acmella oleracea (Asteraceae) extract against Rhipicephalus microplus: What is the influence of spilanthol?
(2020-07) Marchesini, Paula Barroso Cruz; Barbosa, Alan Franco; Sanches, Mirza Nalesso Gomes; Nascimento, Rafael Moreira do; Vale, Francisca Leticia; Fabri, Rodrigo Luiz; Maturano, Ralph; Carvalho, Mário Geraldo de; Monteiro, Caio Marcio de Oliveira
The present study was carried out to evaluate and compare the acaricidal activity of different fractions of Acmella oleracea methanolic extract, containing 0.0 % (F1), 24.5 % (F2), 48.0 % (F3) and 100 % (F4) of spilanthol, on unfed larvae and engorged females from the same Rhipicephalus microplus population. To obtain these fractions, the crude extract was subjected to different extraction procedures using increasingly polarized solvents to isolate the spilanthol compound. The Larval Packet Test was used to evaluate acaricidal activity in unfed larvae at concentrations ranging from 0.2 to 25.0 mg/mL, while for engorged females, the Adult Immersion Test was performed at concentrations from 3.1 to 25.0 mg/mL. The F1 fraction showed no activity on unfed larvae, while a control percentage of 44.6 % was observed at a concentration of 25.0 mg/mL for engorged females. For unfed larvae, the F2 fraction resulted in 95.7 % mortality at a concentration of 1.6 mg/mL, with a control percentage of 92.7 % for engorged females at a concentration of 12.5 mg/mL. Fractions F3 and F4 had similar activity against unfed larvae, with mortality >84.0 % from the concentration of 0.8 mg/mL. This similarity between the fractions was also observed for engorged females from a concentration of 12.5 mg/mL, resulting a control percentage >94.0 %. These results demonstrate that the presence of spilanthol is an important factor for the acaricidal activity of A. oleracea extract. Fraction extracts with 24.5, 48 and 100 % of spilanthol have similar acaricidal activity on R. microplus.
Strategic control of cattle co-parasitized by tick, fly and gastrointestinal nematodes: Is it better to use ecto + endoparasiticide or just endectocide formulations?
(2022-01) Gomes, Lucas Vinicius Costa; Teixeira, Weslen Fabricio Pires; Maciel, Willian Giquelin; Felippelli, Gustavo; Buzzulini, Carolina; Soares, Vando Edésio; Melo, Daniel Pacheco de; Cruz, Breno Cayero; Rodrigues, Daniel de Castro; Ferreira, Lorena Lopes; Monteiro, Caio Marcio de Oliveira; Lopes, Welber Daniel Zanetti; Costa, Alvimar José da
Ticks, flies, and gastrointestinal helminths (GINs) significantly affect cattle productivity; thus, ectoparasiticide, endoparasiticide, and endectocide drugs have commonly been used for their control. The study aimed to compare the technical (parasites counts), productive, and financial effects of a treatment protocol comprising ecto- + endoparasiticides formulations (T01: fluazuron 2.5 mg/kg + fipronil 1.25 mg/kg and fenbendazole 5 mg/kg; n = 15) to a treatment with one formulation of endectocide (T02: ivermectin 450 μg/kg + abamectin 250 μg/kg; n = 15) over 308 days under field conditions in crossbred cattle co-parasitized by Rhipicephalus microplus, Haematobia irritans, and GINs. Bovine weight gain and return on investment (ROI) were also evaluated. Bovines from T01 received four treatments against the cattle tick and two against two GINs. For T02, four treatments were performed. Animals from T01 gained 15.4 kg more than T02 and provided a comparative ROI of 15.8. In cattle co-parasitized with R. microplus, H. irritans, and GINs, the treatment protocol used in this study with ecto- + endoparasiticidal action formulations showed better technical results regarding parasite counts and productive and financial data than the strategic treatment protocol using only an endectocide formulation.
Evaluation of synergism and development of a formulation with thymol, carvacrol and eugenol for Rhipicephalus microplus control
(2019-12) Novato, Tatiane Lopes Pinheiro; Muniz, Natália Cunha; Prata, Márcia Cristina de Azevedo; Furlong, John; Vilela, Fernanda Maria Pinto; Daemon, Erik; Maturano, Ralph; Monteiro, Caio Marcio de Oliveira
The acaricidal activity of combinations of thymol, carvacrol and eugenol was evaluated on larvae and engorged females of the cattle tick Rhipicephalus microplus. The first step assessed the compounds separately, in concentrations of 3.125, 6.25, 12.5 and 25 mg/mL. Then tests were performed with the compounds combined in the ratio of 1:1 at concentrations of 3.125 and 6.25 mg/mL, along with the control group treated with the solvent (3% DMSO). In the second step, combinations were tested incorporated in a formulation at the concentration de 6.25 mg/mL, using the larval packet and adult immersion tests. The associations carvacrol + thymol (3.125 mg/mL), carvacrol + eugenol and thymol + eugenol (6.25 mg/mL) presented synergism, while the other associations had an additive effect. In the experiments with formulation, all combinations caused 100% larval mortality, but the efficacy was under 15% against engorged females. Therefore, the combinations of thymol + carvacrol (3.125 mg/mL) as well as carvacrol + eugenol and eugenol + thymol (6.25 mg/mL) had a synergistic effect on engorged females, but when incorporated in the formulation, the acaricide activity was strong against larvae but weak against engorged females.
Seasonal dynamics of Amblyomma sculptum: a review
(2022-06) Paula, Luiza Gabriella Ferreira de; Nascimento, Rafael Moreira do; Franco, Artur de Oliveira; Szabó, Matias Pablo Juan; Labruna, Marcelo Bahia; Monteiro, Caio Marcio de Oliveira; Krawczak, Felipe da Silva
Background: Amblyomma sculptum is a hard tick that is associated with domestic animals and the transmission of Brazilian spotted fever. This association has motivated several feld studies on this ixodid tick within its distribution area in South America. Thorough knowledge of the seasonal dynamics of A. sculptum in diferent ecological scenarios is required in order to better understand the biological characteristics of this tick and develop techniques for the control and prevention of diseases transmitted by this vector. In this article, we systematically review the seasonal dynamics of A. sculptum and tick collection methodology. Methods: A systematic search of the Scopus, Web of Science, PubMed and Scielo databases was carried out for articles (including dissertations and theses) on the population dynamics of A. sculptum. The inclusion criterion was the report of seasonal dynamic studies on A. sculptum through surveys carried out for at least 1 year with, as methodology, tick collection in the environment and/or tick count/collection on A. sculptum primary hosts (horses or capybaras). Studies carried out before the reclassifcation of Amblyomma cajennense sensu lato in 2014, which referred to Amblyomma cajennense in areas where it is currently known that only A. sculptum occurs, were also included. Articles meeting the inclusion criterion, but not available in online databases, were also added based on the authors’ experience on the subject. Sixteen articles and one thesis were selected for inclusion in this systematic review. Results: Most of the studies were carried out in the southeastern region of Brazil, with a few also carried out in the northeast, center-west and south of Brazil and northwest of Argentina. Five techniques/methods were applied across these studies: CO2 traps, dragging, fagging, visual searches and tick counting on animals, used alone or in combination. Conclusion: Seasonal dynamics of A. sculptum was found to be similar in almost all of the areas studied, with larvae predominating during the autumn, nymphs in the winter and adults in the spring and summer.
Heterorhabditis bacteriophora (Rhabditida: Heterorhabditidae), isolate HP88, induces reproductive and physiological alterations in Biomphalaria glabrata (Gastropoda: Planorbidae): an alternative for biological control of schistosomiasis
(2022-06) Amaral, Ludimila Santos; Tunholi-Alves, Vinícius Menezes; Castro, Lorena Souza; Tunholi, Victor Menezes; Gaudêncio, Fabrício; Monteiro, Caio Marcio de Oliveira; Couto-Chambarelli, Melissa Carvalho Machado do; Pinheiro, Jairo; Freire-Martins, Isabella Vilhena
Heterorhabditis bacteriophora is an entomopathogenic nematode (EPN) that is mutually associated with Photorhabdus luminescens, utilized globally for biological control of numerous organisms. Freshwater snails of the species Biomphalaria glabrata have been incriminated as the main intermediate hosts of Schistosoma mansoni in Brazil, but virtually nothing is known about the susceptibility of these gastropod to EPNs. Information in this respect is relevant for control of these intermediate hosts, and thus of the helminthiases they transmit. This paper for the first time reports the susceptibility of B. glabrata to infective juveniles of H. bacteriophora (isolate HP88) under laboratory conditions. For that purpose, six groups were formed: three Control groups (not exposed) and three Treated groups, in which the snails were exposed to 300 juveniles infecting the nematode over three weeks. The entire experiment was conducted in triplicate, using a total of 270 snails. Significant physiological alterations in B. glabrata were observed in response to the infection by H. bacteriophora HP88, characterized by decreased levels of hemolymphatic glucose as well as reduced contents of glycogen stored in the host's digestive gland. In parallel, the hemolymphatic activity of lactate dehydrogenase increased in the infected snails, indicating that the infection induces breakdown of carbohydrate homeostasis in B. glabrata. Additionally, all the reproductive parameters analyzed were reduced as a consequence of the infection. The results indicate the occurrence of the phenomenon of parasitic castration in the B. glabrata/H. bacteriophora HP88 interface, probably due to the depletion of galactogen in the parasitized organism. Although the infection did not cause lethality in the population of infected snails, H. bacteriophora HP88 compromised the reproductive performance of B. glabrata, suggesting its applicability in programs for biological control of this planorbid.
Potencial de nematoides entomopatogênicos do gênero Heterorhabditis para o controle de Stomoxys calcitrans (Diptera: Muscidae)
(2017-12) Leal, Luís Carlos de Souza Rodrigues; Monteiro, Caio Márcio de Oliveira; Mendonça, Alessandra Ésther de; Bittencourt, Vânia Rita Elias Pinheiro; Bittencourt, Avelino José
The present study verified the pathogenic potential of entomopathogenic nematodes (EPNs) of the genus Heterorhabditis (Heterorhabditis bacteriophora, isolate HP88 and Heterorhabditis baujardi isolate LPP7) to immature stages of Stomoxys calcitrans in the laboratory. All EPN concentrations of the H. bacteriophora HP88 strain caused mean larval mortality greater than 90% after four days. Higher concentrations of the H. baujardi LPP7 isolate (≥50 EPNs/larva) eliminated more than 70% of larvae after six days with the concentration 200 EPNs/larva reaching mortality levels of 93.3%. The larval mortality at all concentrations of EPNs (25, 50, 100, 150, and 200 EPNs/larva) for both strains was significant (p<0.05) when compared to the respective control groups. Concentrations of H. bacteriophora HP88 yielded an LC50 of 0.36 EPN/larva and LC90 of 29.1; while H. baujardi LPP7 yielded an LC50 of 39.85 and LC90 of 239.18. H. bacteriophora HP88 provided greater inhibition of the emergence of adults when compared to the response obtained with H. baujardi LPP7. EPNs did not cause considerable mortality when applied directly to pupae. The set of observed results suggests that the EPNs of the genus Heterorhabditis, isolates HP88 and LPP7, are a promising alternative in the control of the stable fly.
Atividade acaricida dos óleos essenciais de Cinnamomum zeylanicum e Eremanthus erythropappus, compostos majoritários e acetato de cinamila sobre Rhipicephalus microplus
(2021) Marchesini, Paula Barroso Cruz; Oliveira, Débora Ramos de; Gomes, Geovany Amorim; Rodrigues, Tigressa Helena Soares; Maturano, Ralph; Fidelis, Queli Cristina; Catunda Júnior, Francisco Eduardo Aragão; Carvalho, Mário Geraldo de; Bittencourt, Vânia Rita Elias Pinheiro; Monteiro, Caio Márcio de Oliveira
This study aimed to chemically characterize the essential oils (EOs) of Cinnamomum zeylanicum (cinnamon) and Eremanthus erythropappus (candeia) and evaluate their acaricidal activity, together with that of their major compounds and cinnamyl acetate derivative, against Rhipicephalus microplus. Essential oil compounds were identified through gas chromatography. The larval packet test (LPT) at concentrations ranging from 0.31 to 10.0 mg/mL and the adult immersion test (AIT) at concentrations between 2.5 and 60.0 mg/mL were performed. (E)-cinnamaldehyde and α-bisabolol were the major compounds in cinnamon (86.93%) and candeia (78.41%) EOs, respectively. In the LPT, the EOs of cinnamon and candeia and the compounds (E)-cinnamaldehyde, α-bisabolol and cinnamyl acetate resulted in 100% mortality at concentrations of 2.5, 2.5, 5.0, 10.0 and 10.0 mg/mL respectively. In the AIT, percentage control values > 95% were observed for cinnamon and candeia EOs, (E)-cinnamaldehyde and α-bisabolol at the concentrations of 5.0, 60.0, 20.0, and 20.0 mg/mL, respectively, whereas cinnamyl acetate showed low activity. We conclude that EOs and their compounds showed high acaricidal activity, whereas the acetylated derivative of (E)-cinnamaldehyde presented less acaricidal activity on R. microplus engorged females.
Tick infestation level interferes with spray formulation (organophosphate + pyrethroid) efficacy against Rhipicephalus microplus
(2022-03) Felippelli, Gustavo; Teixeira, Weslen Fabricio Pires; Gomes, Lucas Vinicius Costa; Maciel, Willian Giquelin; Cruz, Breno Cayeiro; Buzzulini, Carolina; Santos, Thais Rabelo dos; Ferreira, Lorena Lopes; Soares, Vando Edésio; Rodrigues, Daniel Castro; Monteiro, Caio Márcio de Oliveira; Costa, Alvimar José da; Lopes, Welber Daniel Zanetti
Due to the scarcity of information regarding the control of Rhipicephalus microplus on bovines with different tick burdens, tick counts and the efficacy of a commercial spray formulation (aspersion bath with organophosphate + pyrethroid) were evaluated for animals with a low and high tick burdens for 35 days in a stall test. Thirty-two crossbreed Bos taurus indicus x Bos t. taurus experimentally infested with R. microplus larvae were divided into four groups: T01 high infestation control, T02 high infestation treated, T03 low infestation control, and T04 low infestation treated. The bovines were kept individually in pens and R. microplus females were collected daily. All data were statistically analyzed with a significance level of 5% (P ≤ 0.05). For linear regressions, variables with P≤0.05 and the highest coefficients of determination (R2 ≥ 0.70) were considered the best descriptors. The reliability level was 95%. Tick counts differed (P<0.0001) between T01 and T02 (high infestation control vs. treated), except at day 2 (P >0.05) post-treatment, and efficacy ranged from 85.2 to 50.6%. The number of collected engorged females was lower (P<0.0001) for T04 than for T03 (low infestation treated vs. control) animals from day 3 to 29, and efficacy ranged from 95.2 to 69.8%. In addition, tick burden and efficacy were negatively correlated for both the group of animals with a high tick burden (r = -0.5256; p = 0.0012; R² = 0.2762) and the group of animals with a low tick burden (r = -0.9817; p < 0.0001; R² = 0.9638). In conclusion, a high tick burden on bovines decreases the efficacy of the tested spray acaricide.

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