Atrazine nanoencapsulation improves pre-emergence herbicidal activity against Bidens pilosa without enhancing long-term residual effect on Glycine max

Autor(es)

Preisler, Ana C. ^[1] ; Pereira, Anderson E. S. ^[2] ; Campos, Estefania V. R. ^[2] ; Dalazen, Giliardi ^[3] ; Fraceto, Leonardo F. ^[2] ; Oliveira, Halley C. ^{[1, 4]}

Afiliação do(s) autor(es)

^[1] Univ Estadual Londrina, Dept Anim & Plant Biol, PR445 Km 380, BR-86057970 Londrina, Parana - Brazil

^[2] Sao Paulo State Univ UNESP, Inst Sci & Technol Sorocaba, Dept Environm Engn, Sorocaba - Brazil

^[3] Univ Estadual Londrina, Dept Agron, Londrina, Parana - Brazil

^[4] Dalazen, Giliardi, Univ Estadual Londrina, Dept Agron, Londrina, Parana, Brazil.Preisler, Ana C., Univ Estadual Londrina, Dept Anim & Plant Biol, PR445 Km 380, BR-86057970 Londrina, Parana - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Pest Management Science; v. 76, n. 1, p. 141-149, JAN 2020.
• Citações Web of Science: 2

Resumo

BACKGROUND: Poly(epsilon-caprolactone) nanocapsules (NC+ ATZ) are an efficient carrier system for atrazine and were developed as an alternative to reduce the harmful environmental effects of this herbicide. Here, we analyzed the pre-emergence herbicidal activity of NC+ ATZ against Bidens pilosa and evaluated its residual effect on soybean plants after different periods of soil treatment with the formulations. RESULTS: In contrast to non-nanoatrazine, NC+ ATZ treatment led to very high mortality rates of B. pilosa seedlings even after a tenfold dilution, which suggests that atrazine nanoencapsulation improved its pre-emergence herbicidal activity. In a short-term assay (17 days), soil treatment with all atrazine-containing formulations resulted in intense toxicity to soybean plants. NC+ ATZ at 200 g ha(-1) had the same inhibitory effects on the physiological and growth parameters of soybean plants compared with non-nanoatrazine at 2000 g ha(-1), which suggests that atrazine nanoencapsulation increased the short-term residual effect of the herbicide. In a long-term assay (60 days), a gradual recovery of soybean plants from atrazine phytotoxicity was observed. When comparing the effects of nano- and non-nanoatrazine at the same concentrations, the growth and physiological parameters of soybean plants were mainly affected to the same extent. This indicates that encapsulation of atrazine into poly(epsilon-caprolactone) nanocapsules did not enhance the long-term residual effect of the herbicide on soybean. CONCLUSION: NC+ ATZ could be applied for efficient weed control without additional phytotoxicity to susceptible crops compared with non-nanoatrazine, provided that a safe interval is respected from atrazine application to sowing. (c) 2019 Society of Chemical Industry (AU)

• Processo FAPESP: 17/21004-5 - Agricultura, micro/nanotecnologia e ambiente: da avaliação dos mecanismos de ação a estudos de transporte e toxicidade
• Beneficiário: Leonardo Fernandes Fraceto
• Modalidade de apoio: Auxílio à Pesquisa - Temático