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FUNGOS ENTOMOPATOGÊNICOS PODEM ALTERAR O COMPORTAMENTO ALIMENTAR DE Euschistus heros EM SOJA?

Thu, 05 Mar 2026 00:00:00 GMT

Título: FUNGOS ENTOMOPATOGÊNICOS PODEM ALTERAR O COMPORTAMENTO ALIMENTAR DE Euschistus heros EM SOJA? Autor(es): Oliveira, Guilherme Pereira de Primeiro Orientador: Soares, Frederico Antonio Loureiro Primeiro Membro da Banca: Velozo, Simone Graziele Moio Segundo Membro da Banca: Jesus, Flávio Gonçalves de Terceiro Membro da Banca: Boaventura, Heloiza Alves Abstract: The Neotropical brown stink bug, Euschistus heros, is one of the main pests of soybean, causing significant losses through feeding on pods and seeds. Understanding its feeding behavior is essential for the development of effective pest management strategies. Although entomopathogenic fungi have been widely studied as biological control agents, their effects on insect feeding behavior remain poorly understood. This thesis aimed to evaluate whether entomopathogenic fungi are capable of altering the feeding behavior of E. heros in soybean. To address this question, three complementary studies were conducted, integrating statistical modeling, behavioral analysis using electropenetrography (EPG), and seed damage assessment. The first study focused on the statistical modeling of EPG data, which are characterized by correlated and overdispersed count variables. A multinomial-based approach showed superior performance, with appropriate control of type-I error rates (≈ 0.05) and higher statistical power (> 0.80), whereas conventional models such as Poisson exhibited inflated error rates (> 0.40). The second study evaluated the feeding behavior of E. heros exposed to Cordyceps javanica and Metarhizium anisopliae using EPG. Significant changes (p < 0.05) were observed, including reductions in stylet penetration (Eh1) and ingestion events (Eh2 and Eh3b), increased non-feeding time (Z), and a reduction in the final time of the last probe (FTLP), from 44.09 ± 4.13 h in the control to approximately 31 h in fungal treatments. The third study linked these behavioral changes to seed damage. X-ray analysis revealed a significant reduction in internal seed damage (p < 0.05), from 65.5% in the control to 27.8% for M. anisopliae and 34.4% for C. javanica. Overall, the results demonstrate that entomopathogenic fungi are capable of altering the feeding behavior of Euschistus heros in soybean by reducing the frequency, duration, and continuity of feeding events. Editor: Instituto Federal Goiano Tipo: Tese

QUALIDADE FÍSICA DO SOLO NA DIAGNOSE DA COMPACTAÇÃO E NA AVALIAÇÃO DA AGRICULTURA REGENERATIVA

Thu, 26 Jun 2025 00:00:00 GMT

Título: QUALIDADE FÍSICA DO SOLO NA DIAGNOSE DA COMPACTAÇÃO E NA AVALIAÇÃO DA AGRICULTURA REGENERATIVA Autor(es): Rezende, Alexandre Garcia Primeiro Orientador: Severiano, Eduardo da Costa Primeiro Membro da Banca: Costa, Kátia Aparecida de Pinho Segundo Membro da Banca: Ferreira, Camila Jorge Bernabé Terceiro Membro da Banca: Iori, Piero Abstract: Soil compaction is a major form of physical degradation, severely impacting soil functions essential for agricultural productivity and environmental sustainability. In Brazilian tropical soils with contrasting textures, defining reference values for physical attributes is crucial for structural diagnosis and management planning. This study aimed to model soil compaction in a sandy soil (73 g kg⁻¹ clay) and a very clayey soil (823 g kg⁻¹ clay), proposing reference bulk density (Bd) values associated with beneficial or critical structural conditions. Undisturbed soil samples were subjected to uniaxial compression tests, with structural changes quantified through Bd, least limiting water range, porosity, and mechanical pressures (σp, σb, and σl). Results indicated a severe water availability limitation in the sandy soil and high compaction susceptibility in the very clayey soil. The inverse relationship between clay content and Bd reference values allowed for the refinement of pedotransfer functions tailored to specific textural classes. Following this, the study assessed the impact of regenerative agriculture as a sustainable management strategy to mitigate compaction and improve water infiltration and groundwater recharge in the Brazilian Cerrado. Field assessments were carried out in nine plots across eight farms in southwestern Goiás, using a Regenerative Agriculture Index (RAI) based on five core management principles. Undisturbed soil samples were collected at three depths (surface, shallow, and moderately shallow layers) and evaluated for bulk density, porosity, saturated hydraulic conductivity (K₀), air permeability (Kear), and water retention. Soil compaction diagnosis was performed using region-specific pedotransfer functions. The results showed initial improvements in surface layer physical quality under higher regenerative management levels, but subsurface compaction remained a significant constraint. Multivariate analysis identified macroporosity as the key attribute distinguishing structural conditions. The RAI had a modest yet positive influence on soil hydraulic conductivity and relative density. The study concludes that while regenerative agriculture has potential to restore tropical soil physical quality, its effectiveness is correlated with longer adoption periods and comprehensive implementation of its principles, especially crop diversification. Editor: Instituto Federal Goiano Tipo: Tese

SOLUBILIZADORES DE FOSFATOS ASSOCIADOS A FONTES DE FÓSFORO NA CULTURA DO MILHO

Wed, 28 Aug 2024 00:00:00 GMT

Título: SOLUBILIZADORES DE FOSFATOS ASSOCIADOS A FONTES DE FÓSFORO NA CULTURA DO MILHO Autor(es): Pereira, Adriano Vilela Primeiro Orientador: Alves, José Milton Abstract: Phosphorus (P) stands out in intensive agricultural production due to its low mobility in the soil, low pH level, and high potential for chemical and organic immobilization, which forces producers to apply large amounts of phosphate fertilizers to saturate retention points and make this nutrient available for absorption and assimilation by plants. One of the ways to increase the phosphorus availability to plants is by using phosphorus-solubilizing microorganisms. This paper aimed to evaluate the use of phosphorus-solubilizing microorganisms associated with phosphorus sources in corn crops. This experiment was carried out at the Agricultural Research Center (CPA, Brazilian acronym) in Rio Verde Municipality, Goiás State, Brazil. The design was in a 3x4 factorial scheme, totaling 12 treatments with 4 replicates. The collected data were subjected to analysis of variance by the F test at the 5% probability level and the means were compared using the Turkey test, when significant effects among treatments were found. The results showed that the use of phosphorus-solubilizers in corn crop is effective, promoting increased yield. However, the tested fertilizers did not show the same efficiency regarding phosphorus sources, with triple superphosphate being the most effective source for yield gains. Keywords: Bacteria. Phosphate fertilization. Phosphorus availability. Editor: Instituto Federal Goiano Tipo: Dissertação

DESEMPENHO DE NOVILHOS NELORE E POTENCIAL PRODUTIVO DO CAPIM-PIATÃ EM SISTEMAS DE INTEGRAÇÃO LAVOURA-PECUÁRIA-FLORESTA

Wed, 23 Feb 2022 00:00:00 GMT

Título: DESEMPENHO DE NOVILHOS NELORE E POTENCIAL PRODUTIVO DO CAPIM-PIATÃ EM SISTEMAS DE INTEGRAÇÃO LAVOURA-PECUÁRIA-FLORESTA Autor(es): Barbosa, Ruth; Oliveira, Caroline; Santos, Darliane; Karvatte Junior, Nivaldo; Delmondes, Tais; Macedo, Manoel; Almeida, Roberto Editor: Instituto Federal Goiano Tipo: Relatório de Pesquisa