Artigo em periódico indexado (CNPMA) https://www.alice.cnptia.embrapa.br/alice/handle/item/223 2026-05-01T17:19:29Z 2026-05-01T17:19:29Z SILVA, A. M. da TERAO, D. SILVA, I. S. O. MAIA, A. de H. N. MELO, W. L. de B. NECHET, K. de L. HALFELD-VIEIRA, B. de A. VILELA, E. S. D. FRACAROLLI, J. A. https://www.alice.cnptia.embrapa.br/alice/handle/doc/1186510 2026-04-30T13:52:38Z 2026-01-01T00:00:00Z

Título: Modulated UV-C radiation as an innovative strategy for postharvest disease control and quality preservation in papaya and orange fruits. Autoria: SILVA, A. M. da; TERAO, D.; SILVA, I. S. O.; MAIA, A. de H. N.; MELO, W. L. de B.; NECHET, K. de L.; HALFELD-VIEIRA, B. de A.; VILELA, E. S. D.; FRACAROLLI, J. A. Conteúdo: Abstract: Postharvest losses remain a major challenge in fruit production systems, affecting both climacteric fruits, such as papaya, and non-climacteric fruits, such as orange. Ultraviolet-C (UV-C) radiation has emerged as a sustainable alternative to chemical fungicides; however, its effectiveness depends on the applied dose and radiation delivery mode. This study investigated the comparative effects of continuous and frequency-modulated UV-C radiation on postharvest disease control and fruit quality on papaya and orange. Two independent experiments were conducted. Experiment 1 evaluated the influence of modulation frequencies (0, 15, 30, and 45 Hz) on disease progression, while Experiment 2 combined the most effective frequencies with different exposure times to define optimal treatment conditions. In papaya, UV-C modulation at 30 Hz/20 s (0.44 kJ m⁻²) provided effective control of anthracnose (67% reduction in incidence), while minimizing photothermal damage, with no visible epidermal injuries. In orange, continuous UV-C radiation (0 Hz) applied for 30 s (1.99 kJ m⁻²), completely suppressed sour rot development (100%) without visible peel injury. Therefore, the selection of the UV-C radiation application mode is species-specific. Notably, modulation of UV-C irradiation has demonstrated enhanced efficiency in postharvest disease control while reducing epidermal burn. Additionally, the treatments stimulated defense responses, as evidenced by increased activities of phenylalanine ammonia-lyase, polyphenoloxidase, peroxidase, and catalase. Physicochemical analyses confirmed the maintenance of firmness, acidity, and color stability, indicating the preservation of postharvest quality in both fruits. Overall, modulated UV-C radiation represents a promising non-chemical postharvest technology, enabling efficient disease control while maintaining fruit quality.

2026-01-01T00:00:00Z WILCKEN, C. F. SOLIMAN, E. P. SA, L. A. N. de BARBOSA, L. R. DIAS, T. K. R. FERREIRA-FILHO, P. J. OLIVEIRA, R. J. R. https://www.alice.cnptia.embrapa.br/alice/handle/doc/1186227 2026-04-12T01:36:04Z 2010-01-01T00:00:00Z

Título: Bronze bug Thaumastocoris peregrinus carpinteiro and dellapé (Hemiptera: Thaumastocoridae) on Eucalyptus in Brazil and its distribution. Autoria: WILCKEN, C. F.; SOLIMAN, E. P.; SA, L. A. N. de; BARBOSA, L. R.; DIAS, T. K. R.; FERREIRA-FILHO, P. J.; OLIVEIRA, R. J. R. Conteúdo: The bronze bug Thaumastocoris peregrinus Carpintero & Dellapé (Hemiptera: Thaumastocoridae) was detected infesting Eucalyptus trees in Brazil in 2008, in the states of Sao Paulo, Rio Grande do Sul and Minas Gerais and in 2009 was found in the state of Espírito Santo, Mato Grosso do Sul, Rio de Janeiro and Paraná. Details about geographical spread, means of introduction, impact in Eucalyptus plantations and natural enemies observed in the field are discussed.

2010-01-01T00:00:00Z XAVIER, M. G. B. RAMOS FILHO, L. O. ASSIS, R. L. de MORAIS, G. F. de https://www.alice.cnptia.embrapa.br/alice/handle/doc/1185854 2026-03-28T12:05:23Z 2026-01-01T00:00:00Z

Título: O potencial das redes multi-atores no desenvolvimento de sistemas agroflorestais: o caso da Rede Agroflorestal da Região de Ribeirão Preto e da rede de sistemas agroflorestais agroecológicos do sul do Brasil. Autoria: XAVIER, M. G. B.; RAMOS FILHO, L. O.; ASSIS, R. L. de; MORAIS, G. F. de Conteúdo: Este artigo analisa o papel das redes sociais multiatores no desenvolvimento de sistemas agroflorestais no Brasil, com foco em dois casos de estudo: a Rede Agroflorestal de Ribeirão Preto (Estado de São Paulo) e a Rede de Sistemas Agroflorestais Agroecológicos do Sul do Brasil (Rede SAFAS-Estados do Rio Grande do Sul, Santa Catarina e Paraná). Por meio de uma metodologia qualitativa baseada em análise documental, examinamse as dinâmicas de cooperação entre agricultores familiares, pesquisadores, instituições públicas e outros atores sociais. Destacase como essas redes contribuem para o fortalecimento da transição agroecológica ao fomentar a troca de conhecimentos, a inovação social e a articulação de políticas públicas que apoiam práticas sustentáveis. Os resultados indicam que essas redes são essenciais para superar desafios comuns, como o acesso limitado a mercados, insumos e assistência técnica especializada. Além disso, atividades coletivas, como macro-oficinas, oficinas participativas e campanhas de conscientização, demonstraram ser ferramentas eficazes para promover a cocriação de soluções em diversos territórios. Apesar das limitações financeiras e institucionais, as redes multiatores emergem como espaços de aprendizagem e inovação cruciais para a viabilidade dos sistemas agroflorestais. Este estudo contribui para o debate sobre como as redes sociais podem desempenhar um papel estratégico na transição para modelos agrícolas mais resilientes e sustentáveis no Brasil.

2026-01-01T00:00:00Z LIMA, M. A. de BATISTA, G. das G. SILVA, J. A. da VILLELA, O. V. VIEIRA, R. F. GALVAO, J. A. H. https://www.alice.cnptia.embrapa.br/alice/handle/doc/1185517 2026-03-21T13:33:33Z 2025-01-01T00:00:00Z

Título: Seasonal methane emissions in paddy rice with two cultivars in the southeast of Brasil. Autoria: LIMA, M. A. de; BATISTA, G. das G.; SILVA, J. A. da; VILLELA, O. V.; VIEIRA, R. F.; GALVAO, J. A. H. Conteúdo: Resumo: Flooded rice cultivation represents one of the main global anthropogenic sources of methane (CH4), a major greenhouse gas that strongly affects atmospheric photochemistry. CH4 production and emissions are influenced by several factors, such as climate, organic residues in water and soil, root exudates, water management, soil physicochemical and biological characteristics, and the cultivar. There are few studies in Brazil focused on the influence of cultivars on CH4 emissions. This experiment aimed to evaluate seasonal methane emissions using two varieties, IAC 105 and Epagri 106, in a pre-germinated cultivation system with a continuous water regime in the municipality of Pindamonhangaba, São Paulo. Methane emissions were quantified using the static chamber method and chromatographic analysis. Methane emissions increased with increasing tillering, with the main peak occurring at flowering. Despite the different life cycles of the varieties, no significant difference was found between seasonal methane emissions (117.91 kg CH4 ha-1 for IAC 105 and 108.92 kg CH4 ha-1 for Epagri 106). These emissions were not related to plant height, number of tillers, and grain yield. An emission factor of 0.98 kg CH4 ha-1 day-1 was estimated for IAC 105 and 0.95 kg CH4 ha-1 day-1 for Epagri 106. The yield-scaled pGWP (YpGWP) was estimated at 1.02 kg CO2eq kg-1 grain for both cultivars.

2025-01-01T00:00:00Z